Add node tests

.github/workflows/test.yml

@@ -47,8 +47,8 @@ jobs:
       - name: Run Tests
         run: npm run pretest
 
-  spec:
+  browser:
-    name: Spec
+    name: Browser
     runs-on: ubuntu-latest
 
     strategy:
@@ -80,7 +80,42 @@ jobs:
         run: npm ci
 
       - name: Run Tests
-        run: npm run test-spec
+        run: npm run test-browser
+
+  node:
+    name: Node
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+    steps:
+      - name: Clone Repository
+        uses: actions/checkout@v2
+
+      - name: Set Node.js Version
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16
+
+      - name: Determine Cache Directory
+        id: npm-cache
+        run: |
+          echo "::set-output name=dir::$(npm config get cache)"
+
+      - name: Configure Job Cache
+        uses: actions/cache@v1
+        with:
+          path: ${{ steps.npm-cache.outputs.dir }}
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Run Tests
+        run: npm run test-node
 
   build:
     name: Build

package.json

@@ -13,8 +13,9 @@
     "lint": "eslint tasks test src/ol examples config",
     "pretest": "npm run lint && npm run typecheck",
     "test-rendering": "node test/rendering/test.js",
-    "test-spec": "npm run karma -- --single-run --log-level error",
+    "test-browser": "npm run karma -- --single-run --log-level error",
-    "test": "npm run test-spec && npm run test-rendering -- --force",
+    "test-node": "mocha --recursive test/node",
+    "test": "npm run test-browser && npm run test-node && npm run test-rendering -- --force",
     "karma": "karma start test/browser/karma.config.cjs",
     "start": "npm run serve-examples",
     "serve-examples": "webpack serve --config examples/webpack/config.js --mode development",

test/README.md

@@ -1,7 +1,7 @@
 ## Included in this directory
 
 - browser - Unit/integration tests run in a browser
-
+- node - Unit tests run with Node.js
 - rendering - Tests that make assertions about rendered map output
 
 

test/browser/spec/ol/asserts.test.js

@@ -1,11 +0,0 @@
-import {assert} from '../../../../src/ol/asserts.js';
-
-describe('ol.asserts', function () {
-  describe('ol.asserts.assert', function () {
-    it('throws an exception', function () {
-      expect(function () {
-        assert(false, 42);
-      }).to.throwException();
-    });
-  });
-});

test/browser/spec/ol/index.test.js

@@ -1,22 +0,0 @@
-import {getUid} from '../../../../src/ol/util.js';
-
-describe('getUid()', function () {
-  it('is constant once generated', function () {
-    const a = {};
-    expect(getUid(a)).to.be(getUid(a));
-  });
-
-  it('generates a strictly increasing sequence', function () {
-    const a = {};
-    const b = {};
-    const c = {};
-    getUid(a);
-    getUid(c);
-    getUid(b);
-
-    //uid order should be a < c < b
-    expect(getUid(a)).to.be.lessThan(getUid(c));
-    expect(getUid(c)).to.be.lessThan(getUid(b));
-    expect(getUid(a)).to.be.lessThan(getUid(b));
-  });
-});

test/browser/spec/ol/math.test.js

@@ -1,162 +0,0 @@
-import {
-  clamp,
-  cosh,
-  lerp,
-  log2,
-  modulo,
-  solveLinearSystem,
-  toDegrees,
-  toRadians,
-} from '../../../../src/ol/math.js';
-
-describe('ol.math.clamp', function () {
-  it('returns the correct value at -Infinity', function () {
-    expect(clamp(-Infinity, 10, 20)).to.eql(10);
-  });
-
-  it('returns the correct value at min', function () {
-    expect(clamp(10, 10, 20)).to.eql(10);
-  });
-
-  it('returns the correct value at mid point', function () {
-    expect(clamp(15, 10, 20)).to.eql(15);
-  });
-
-  it('returns the correct value at max', function () {
-    expect(clamp(20, 10, 20)).to.eql(20);
-  });
-
-  it('returns the correct value at Infinity', function () {
-    expect(clamp(Infinity, 10, 20)).to.eql(20);
-  });
-});
-
-describe('ol.math.cosh', function () {
-  it('returns the correct value at -Infinity', function () {
-    expect(cosh(-Infinity)).to.eql(Infinity);
-  });
-
-  it('returns the correct value at -1', function () {
-    expect(cosh(-1)).to.roughlyEqual(1.5430806348152437, 1e-9);
-  });
-
-  it('returns the correct value at 0', function () {
-    expect(cosh(0)).to.eql(1);
-  });
-
-  it('returns the correct value at 1', function () {
-    expect(cosh(1)).to.roughlyEqual(1.5430806348152437, 1e-9);
-  });
-
-  it('returns the correct value at Infinity', function () {
-    expect(cosh(Infinity)).to.eql(Infinity);
-  });
-});
-
-describe('ol.math.log2', function () {
-  it('returns the correct value at Infinity', function () {
-    expect(log2(Infinity)).to.eql(Infinity);
-  });
-
-  it('returns the correct value at 3', function () {
-    expect(log2(3)).to.roughlyEqual(1.584962500721156, 1e-9);
-  });
-
-  it('returns the correct value at 2', function () {
-    expect(log2(2)).to.eql(1);
-  });
-
-  it('returns the correct value at 1', function () {
-    expect(log2(1)).to.eql(0);
-  });
-
-  it('returns the correct value at 0', function () {
-    expect(log2(0)).to.eql(-Infinity);
-  });
-
-  it('returns the correct value at -1', function () {
-    expect(log2(-1).toString()).to.eql('NaN');
-  });
-});
-
-describe('ol.math.solveLinearSystem', function () {
-  it('calculates correctly', function () {
-    const result = solveLinearSystem([
-      [2, 1, 3, 1],
-      [2, 6, 8, 3],
-      [6, 8, 18, 5],
-    ]);
-    expect(result[0]).to.roughlyEqual(0.3, 1e-9);
-    expect(result[1]).to.roughlyEqual(0.4, 1e-9);
-    expect(result[2]).to.roughlyEqual(0, 1e-9);
-  });
-
-  it('can handle singular matrix', function () {
-    const result = solveLinearSystem([
-      [2, 1, 3, 1],
-      [2, 6, 8, 3],
-      [2, 1, 3, 1],
-    ]);
-    expect(result).to.be(null);
-  });
-});
-
-describe('ol.math.toDegrees', function () {
-  it('returns the correct value at -π', function () {
-    expect(toDegrees(-Math.PI)).to.be(-180);
-  });
-  it('returns the correct value at 0', function () {
-    expect(toDegrees(0)).to.be(0);
-  });
-  it('returns the correct value at π', function () {
-    expect(toDegrees(Math.PI)).to.be(180);
-  });
-});
-
-describe('ol.math.toRadians', function () {
-  it('returns the correct value at -180', function () {
-    expect(toRadians(-180)).to.be(-Math.PI);
-  });
-  it('returns the correct value at 0', function () {
-    expect(toRadians(0)).to.be(0);
-  });
-  it('returns the correct value at 180', function () {
-    expect(toRadians(180)).to.be(Math.PI);
-  });
-});
-
-describe('ol.math.modulo', function () {
-  it('256 / 8 returns 0', function () {
-    expect(modulo(256, 8)).to.be(0);
-  });
-  it('positive and positive returns a positive ', function () {
-    expect(modulo(7, 8)).to.be(7);
-  });
-  it('same Dividend and Divisor returns 0', function () {
-    expect(modulo(4, 4)).to.be(0);
-  });
-  it('negative and positive returns positive', function () {
-    expect(modulo(-3, 4)).to.be(1);
-  });
-  it('negative and negative returns negative', function () {
-    expect(modulo(-4, -5)).to.be(-4);
-    expect(modulo(-3, -4)).to.be(-3);
-  });
-  it('positive and negative returns negative', function () {
-    expect(modulo(3, -4)).to.be(-1);
-    expect(modulo(1, -5)).to.be(-4);
-    expect(modulo(6, -5)).to.be(-4);
-  });
-});
-
-describe('ol.math.lerp', function () {
-  it('correctly interpolated numbers', function () {
-    expect(lerp(0, 0, 0)).to.be(0);
-    expect(lerp(0, 1, 0)).to.be(0);
-    expect(lerp(1, 11, 5)).to.be(51);
-  });
-  it('correctly interpolates floats', function () {
-    expect(lerp(0, 1, 0.5)).to.be(0.5);
-    expect(lerp(0.25, 0.75, 0.5)).to.be(0.5);
-  });
-});

test/browser/spec/ol/objectutil.test.js

@@ -1,64 +0,0 @@
-import {assign, clear, getValues, isEmpty} from '../../../../src/ol/obj.js';
-
-describe('ol.obj.assign()', function () {
-  it('is an alias for Object.assign() where available', function () {
-    if (typeof Object.assign === 'function') {
-      expect(assign).to.be(Object.assign);
-    }
-  });
-
-  it('assigns properties from a source object to a target object', function () {
-    const source = {
-      sourceProp1: 'sourceValue1',
-      sourceProp2: 'sourceValue2',
-    };
-
-    const target = {
-      sourceProp1: 'overridden',
-      targetProp1: 'targetValue1',
-    };
-
-    const assigned = assign(target, source);
-    expect(assigned).to.be(target);
-    expect(assigned.sourceProp1).to.be('sourceValue1');
-    expect(assigned.sourceProp2).to.be('sourceValue2');
-    expect(assigned.targetProp1).to.be('targetValue1');
-  });
-
-  it('throws a TypeError with `undefined` as target', function () {
-    expect(() => assign()).to.throwException(
-      /Cannot convert undefined or null to object/
-    );
-  });
-
-  it('throws a TypeError with `null` as target', function () {
-    expect(() => assign(null)).to.throwException(
-      /Cannot convert undefined or null to object/
-    );
-  });
-});
-
-describe('ol.obj.clear()', function () {
-  it('removes all properties from an object', function () {
-    expect(isEmpty(clear({foo: 'bar'}))).to.be(true);
-    expect(isEmpty(clear({foo: 'bar', num: 42}))).to.be(true);
-    expect(isEmpty(clear({}))).to.be(true);
-    expect(isEmpty(clear(null))).to.be(true);
-  });
-});
-
-describe('ol.obj.getValues()', function () {
-  it('gets a list of property values from an object', function () {
-    expect(getValues({foo: 'bar', num: 42}).sort()).to.eql([42, 'bar']);
-    expect(getValues([])).to.eql([]);
-  });
-});
-
-describe('ol.obj.isEmpty()', function () {
-  it('checks if an object has any properties', function () {
-    expect(isEmpty({})).to.be(true);
-    expect(isEmpty(null)).to.be(true);
-    expect(isEmpty({foo: 'bar'})).to.be(false);
-    expect(isEmpty({foo: false})).to.be(false);
-  });
-});

test/node/.eslintrc

@@ -0,0 +1,8 @@
+{
+  "env": {
+    "mocha": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 2017
+  }
+}

test/node/expect.js

@@ -0,0 +1,36 @@
+import expect from 'expect.js';
+
+/**
+ * Assert value is within some tolerance of a number.
+ * @param {number} n Number.
+ * @param {number} tol Tolerance.
+ * @return {expect.Assertion} The assertion.
+ */
+expect.Assertion.prototype.roughlyEqual = function (n, tol) {
+  this.assert(
+    Math.abs(this.obj - n) <= tol,
+    function () {
+      return (
+        'expected ' +
+        expect.stringify(this.obj) +
+        ' to be within ' +
+        tol +
+        ' of ' +
+        n
+      );
+    },
+    function () {
+      return (
+        'expected ' +
+        expect.stringify(this.obj) +
+        ' not to be within ' +
+        tol +
+        ' of ' +
+        n
+      );
+    }
+  );
+  return this;
+};
+
+export default expect;

test/node/ol/AssertionError.test.js

@@ -1,7 +1,8 @@
-import AssertionError from '../../../../src/ol/AssertionError.js';
+import AssertionError from '../../../src/ol/AssertionError.js';
-import {VERSION} from '../../../../src/ol/util.js';
+import expect from '../expect.js';
+import {VERSION} from '../../../src/ol/util.js';
 
-describe('ol.AssertionError', function () {
+describe('ol/AssertionError.js', function () {
   it('generates an error', function () {
     const error = new AssertionError(42);
     expect(error).to.be.an(Error);

test/node/ol/Collection.test.js

@@ -1,8 +1,10 @@
-import Collection from '../../../../src/ol/Collection.js';
+import Collection from '../../../src/ol/Collection.js';
-import CollectionEventType from '../../../../src/ol/CollectionEventType.js';
+import CollectionEventType from '../../../src/ol/CollectionEventType.js';
-import {listen} from '../../../../src/ol/events.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
+import {listen} from '../../../src/ol/events.js';
 
-describe('ol.collection', function () {
+describe('ol/Collection.js', function () {
   let collection;
 
   beforeEach(function () {

test/node/ol/Disposable.test.js

@@ -1,6 +1,8 @@
-import Disposable from '../../../../src/ol/Disposable.js';
+import Disposable from '../../../src/ol/Disposable.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
 
-describe('ol.Disposable', function () {
+describe('ol/Disposable.js', function () {
   describe('constructor', function () {
     it('creates an instance', function () {
       const disposable = new Disposable();

test/node/ol/Feature.test.js

@@ -1,9 +1,11 @@
-import Feature, {createStyleFunction} from '../../../../src/ol/Feature.js';
+import Feature, {createStyleFunction} from '../../../src/ol/Feature.js';
-import Point from '../../../../src/ol/geom/Point.js';
+import Point from '../../../src/ol/geom/Point.js';
-import Style from '../../../../src/ol/style/Style.js';
+import Style from '../../../src/ol/style/Style.js';
-import {isEmpty} from '../../../../src/ol/obj.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
+import {isEmpty} from '../../../src/ol/obj.js';
 
-describe('ol.Feature', function () {
+describe('ol/Feature.js', function () {
   describe('constructor', function () {
     it('creates a new feature', function () {
       const feature = new Feature();

test/node/ol/Object.test.js

@@ -1,7 +1,9 @@
-import BaseObject from '../../../../src/ol/Object.js';
+import BaseObject from '../../../src/ol/Object.js';
-import {listen} from '../../../../src/ol/events.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
+import {listen} from '../../../src/ol/events.js';
 
-describe('ol.Object', function () {
+describe('ol/Object.js', function () {
   let o;
   beforeEach(function () {
     o = new BaseObject();

test/node/ol/Observable.test.js

@@ -1,7 +1,9 @@
-import EventTarget from '../../../../src/ol/events/Target.js';
+import EventTarget from '../../../src/ol/events/Target.js';
-import Observable, {unByKey} from '../../../../src/ol/Observable.js';
+import Observable, {unByKey} from '../../../src/ol/Observable.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
 
-describe('ol.Observable', function () {
+describe('ol/Observable.js', function () {
   describe('constructor', function () {
     it('creates a new observable', function () {
       const observable = new Observable();

test/node/ol/array.test.js

@@ -0,0 +1,612 @@
+import expect from '../expect.js';
+import {
+  binarySearch,
+  equals,
+  extend,
+  find,
+  findIndex,
+  isSorted,
+  linearFindNearest,
+  numberSafeCompareFunction,
+  remove,
+  reverseSubArray,
+  stableSort,
+} from '../../../src/ol/array.js';
+
+describe('ol/array.js', function () {
+  describe('binarySearch', function () {
+    const insertionPoint = function (position) {
+      return -(position + 1);
+    };
+    const revNumCompare = function (a, b) {
+      return b - a;
+    };
+
+    describe('default comparison on array of String(s)', function () {
+      const a = [
+        '1000',
+        '9',
+        'AB',
+        'ABC',
+        'ABCABC',
+        'ABD',
+        'ABDA',
+        'B',
+        'B',
+        'B',
+        'C',
+        'CA',
+        'CC',
+        'ZZZ',
+        'ab',
+        'abc',
+        'abcabc',
+        'abd',
+        'abda',
+        'b',
+        'c',
+        'ca',
+        'cc',
+        'zzz',
+      ];
+
+      it("should find '1000' at index 0", function () {
+        expect(binarySearch(a, '1000')).to.be(0);
+      });
+      it("should find 'zzz' at index " + (a.length - 1), function () {
+        expect(binarySearch(a, 'zzz')).to.be(a.length - 1);
+      });
+      it("should find 'C' at index 10", function () {
+        expect(binarySearch(a, 'C')).to.be(10);
+      });
+      it("should find 'B' at index 7 || 8 || 9", function () {
+        const pos = binarySearch(a, 'B');
+        expect(pos == 7 || pos == 8 || pos == 9).to.be.ok();
+      });
+      it("should not find '100'", function () {
+        const pos = binarySearch(a, '100');
+        expect(pos < 0).to.be.ok();
+      });
+      it("should have an insertion point of 0 for '100'", function () {
+        const pos = binarySearch(a, '100');
+        expect(insertionPoint(pos)).to.be(0);
+      });
+      it("should not find 'zzz0'", function () {
+        const pos = binarySearch(a, 'zzz0');
+        expect(pos < 0).to.be.ok();
+      });
+      it(
+        'should have an insertion point of ' + a.length + " for 'zzz0'",
+        function () {
+          const pos = binarySearch(a, 'zzz0');
+          expect(insertionPoint(pos)).to.be(a.length);
+        }
+      );
+      it("should not find 'BA'", function () {
+        const pos = binarySearch(a, 'zzz0');
+        expect(pos < 0).to.be.ok();
+      });
+      it("should have an insertion point of 10 for 'BA'", function () {
+        const pos = binarySearch(a, 'BA');
+        expect(insertionPoint(pos)).to.be(10);
+      });
+    });
+
+    describe('0 length array with default comparison', function () {
+      const b = [];
+      it("should not find 'a'", function () {
+        expect(binarySearch(b, 'a') < 0).to.be.ok();
+      });
+      it("should have an insertion point of 0 for 'a'", function () {
+        const pos = binarySearch(b, 'a');
+        expect(insertionPoint(pos)).to.be(0);
+      });
+    });
+
+    describe('single element array with default lexiographical comparison', function () {
+      const c = ['only item'];
+      it("should find 'only item' at index 0", function () {
+        expect(binarySearch(c, 'only item')).to.be(0);
+      });
+      it("should not find 'a'", function () {
+        expect(binarySearch(c, 'a') < 0).to.be.ok();
+      });
+      it("should have an insertion point of 0 for 'a'", function () {
+        const pos = binarySearch(c, 'a');
+        expect(insertionPoint(pos)).to.be(0);
+      });
+      it("should not find 'z'", function () {
+        expect(binarySearch(c, 'z') < 0).to.be.ok();
+      });
+      it("should have an insertion point of 1 for 'z'", function () {
+        const pos = binarySearch(c, 'z');
+        expect(insertionPoint(pos)).to.be(1);
+      });
+    });
+
+    describe('default comparison on array of Number(s)', function () {
+      const d = [
+        -897123.9,
+        -321434.58758,
+        -1321.3124,
+        -324,
+        -9,
+        -3,
+        0,
+        0,
+        0,
+        0.31255,
+        5,
+        142.88888708,
+        334,
+        342,
+        453,
+        54254,
+      ];
+      it('should find -897123.9 at index 0', function () {
+        expect(binarySearch(d, -897123.9)).to.be(0);
+      });
+      it('should find 54254 at index ' + (d.length - 1), function () {
+        expect(binarySearch(d, 54254)).to.be(d.length - 1);
+      });
+      it('should find -3 at index 5', function () {
+        expect(binarySearch(d, -3)).to.be(5);
+      });
+      it('should find 0 at index 6 || 7 || 8', function () {
+        const pos = binarySearch(d, 0);
+        expect(pos == 6 || pos == 7 || pos == 8).to.be(true);
+      });
+      it('should not find -900000', function () {
+        const pos = binarySearch(d, -900000);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 0 for -900000', function () {
+        const pos = binarySearch(d, -900000);
+        expect(insertionPoint(pos)).to.be(0);
+      });
+      it('should not find 54255', function () {
+        const pos = binarySearch(d, 54255);
+        expect(pos < 0).to.be(true);
+      });
+      it(
+        'should have an insertion point of ' + d.length + ' for 54255',
+        function () {
+          const pos = binarySearch(d, 54255);
+          expect(insertionPoint(pos)).to.be(d.length);
+        }
+      );
+      it('should not find 1.1', function () {
+        const pos = binarySearch(d, 1.1);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 10 for 1.1', function () {
+        const pos = binarySearch(d, 1.1);
+        expect(insertionPoint(pos)).to.be(10);
+      });
+    });
+
+    describe('custom comparison function, which reverse orders numbers', function () {
+      const e = [
+        54254,
+        453,
+        342,
+        334,
+        142.88888708,
+        5,
+        0.31255,
+        0,
+        0,
+        0,
+        -3,
+        -9,
+        -324,
+        -1321.3124,
+        -321434.58758,
+        -897123.9,
+      ];
+      it('should find 54254 at index 0', function () {
+        const pos = binarySearch(e, 54254, revNumCompare);
+        expect(pos).to.be(0);
+      });
+      it('should find -897123.9 at index ' + (e.length - 1), function () {
+        const pos = binarySearch(e, -897123.9, revNumCompare);
+        expect(pos).to.be(e.length - 1);
+      });
+      it('should find -3 at index 10', function () {
+        const pos = binarySearch(e, -3, revNumCompare);
+        expect(pos).to.be(10);
+      });
+      it('should find 0 at index 7 || 8 || 9', function () {
+        const pos = binarySearch(e, 0, revNumCompare);
+        expect(pos == 7 || pos == 8 || pos == 9).to.be(true);
+      });
+      it('should not find 54254.1', function () {
+        const pos = binarySearch(e, 54254.1, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 0 for 54254.1', function () {
+        const pos = binarySearch(e, 54254.1, revNumCompare);
+        expect(insertionPoint(pos)).to.be(0);
+      });
+      it('should not find -897124', function () {
+        const pos = binarySearch(e, -897124, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it(
+        'should have an insertion point of ' + e.length + ' for -897124',
+        function () {
+          const pos = binarySearch(e, -897124, revNumCompare);
+          expect(insertionPoint(pos)).to.be(e.length);
+        }
+      );
+      it('should not find 1.1', function () {
+        const pos = binarySearch(e, 1.1, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 0 for 1.1', function () {
+        const pos = binarySearch(e, 1.1, revNumCompare);
+        expect(insertionPoint(pos)).to.be(6);
+      });
+    });
+
+    describe('0 length array with custom comparison function', function () {
+      const f = [];
+      it('should not find 0', function () {
+        const pos = binarySearch(f, 0, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 0 for 0', function () {
+        const pos = binarySearch(f, 0, revNumCompare);
+        expect(insertionPoint(pos)).to.be(0);
+      });
+    });
+
+    describe('single element array with custom comparison function', function () {
+      const g = [1];
+      it('should find 1 at index 0', function () {
+        const pos = binarySearch(g, 1, revNumCompare);
+        expect(pos).to.be(0);
+      });
+      it('should not find 2', function () {
+        const pos = binarySearch(g, 2, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 0 for 2', function () {
+        const pos = binarySearch(g, 2, revNumCompare);
+        expect(insertionPoint(pos)).to.be(0);
+      });
+      it('should not find 0', function () {
+        const pos = binarySearch(g, 0, revNumCompare);
+        expect(pos < 0).to.be(true);
+      });
+      it('should have an insertion point of 1 for 0', function () {
+        const pos = binarySearch(g, 0, revNumCompare);
+        expect(insertionPoint(pos)).to.be(1);
+      });
+    });
+
+    describe('finding first index when multiple candidates', function () {
+      it('should find the index of the first 0', function () {
+        expect(binarySearch([0, 0, 1], 0)).to.be(0);
+      });
+      it('should find the index of the first 1', function () {
+        expect(binarySearch([0, 1, 1], 1)).to.be(1);
+      });
+    });
+
+    describe("Don't use Array#slice, Function#apply and Function#call", function () {
+      const a = [1, 5, 7, 11, 13, 16, 19, 24, 28, 31, 33, 36, 40, 50, 52, 55];
+      const calls = {
+        'Array#slice': false,
+        'Function#apply': false,
+        'Function#call': false,
+      };
+      let origArraySlice;
+      let origFunctionApply;
+      let origFunctionCall;
+
+      it('does not use potentially slow methods (default & custom compare)', function () {
+        // Mockup (I failed to use sinon.spy and beforeEach-hooks)
+        origArraySlice = Array.prototype.slice;
+        origFunctionApply = Function.prototype.apply;
+        origFunctionCall = Function.prototype.call;
+        Array.prototype.slice = function () {
+          calls['Array#slice'] = true;
+        };
+        Function.prototype.apply = function () {
+          calls['Function#apply'] = true;
+        };
+        Function.prototype.call = function () {
+          calls['Function#call'] = true;
+        };
+
+        // Now actually call and test the method twice
+        binarySearch(a, 48);
+        binarySearch(a, 13, function (a, b) {
+          return a > b ? 1 : a < b ? -1 : 0;
+        });
+
+        // Restore mocked up methods
+        Array.prototype.slice = origArraySlice;
+        Function.prototype.apply = origFunctionApply;
+        Function.prototype.call = origFunctionCall;
+
+        // Expectations
+        expect(calls['Array#slice']).to.be(false);
+        expect(calls['Function#apply']).to.be(false);
+        expect(calls['Function#call']).to.be(false);
+      });
+    });
+
+    describe('when items are not found', function () {
+      const arr = [1, 2, 2, 2, 3, 5, 9];
+
+      it('should return the index of where the item would go plus one, negated, if the item is not found', function () {
+        expect(binarySearch(arr, 4)).to.equal(-6);
+      });
+      it('should work even on empty arrays', function () {
+        expect(binarySearch([], 42)).to.equal(-1);
+      });
+      it('should work even on arrays of doubles', function () {
+        expect(binarySearch([0.0, 0.1, 0.2, 0.3, 0.4], 0.25)).to.equal(-4);
+      });
+    });
+  });
+
+  describe('equals', function () {
+    it('returns true for [] == []', function () {
+      expect(equals([], [])).to.be(true);
+    });
+    it('returns true for [1] == [1]', function () {
+      expect(equals([1], [1])).to.be(true);
+    });
+    it("returns true for ['1'] == ['1']", function () {
+      expect(equals(['1'], ['1'])).to.be(true);
+    });
+    it("returns false for [1] == ['1']", function () {
+      expect(equals([1], ['1'])).to.be(false);
+    });
+    it('returns true for [null] == [null]', function () {
+      expect(equals([null], [null])).to.be(true);
+    });
+    it('returns false for [null] == [undefined]', function () {
+      expect(equals([null], [undefined])).to.be(false);
+    });
+    it('returns true for [1, 2] == [1, 2]', function () {
+      expect(equals([1, 2], [1, 2])).to.be(true);
+    });
+    it('returns false for [1, 2] == [2, 1]', function () {
+      expect(equals([1, 2], [2, 1])).to.be(false);
+    });
+    it('returns false for [1, 2] == [1]', function () {
+      expect(equals([1, 2], [1])).to.be(false);
+    });
+    it('returns false for [1] == [1, 2]', function () {
+      expect(equals([1], [1, 2])).to.be(false);
+    });
+    it('returns false for [{}] == [{}]', function () {
+      expect(equals([{}], [{}])).to.be(false);
+    });
+  });
+  describe('extend', function () {
+    it('extends an array in place with an array', function () {
+      const a = [0, 1];
+      extend(a, [2, 3]);
+      expect(a).to.eql([0, 1, 2, 3]);
+    });
+    it('extends an array in place with a number', function () {
+      const a = [0, 1];
+      extend(a, 2);
+      expect(a).to.eql([0, 1, 2]);
+    });
+    it('extends an array in place with a big array', function () {
+      const a = [];
+      let i = 250000; // original test has 1.000.000, but that was too slow
+      const bigArray = Array(i);
+      while (i--) {
+        bigArray[i] = i;
+      }
+      extend(a, bigArray);
+      expect(a).to.eql(bigArray);
+    });
+  });
+
+  describe('find', function () {
+    it('finds numbers in an array', function () {
+      const a = [0, 1, 2, 3];
+      const b = find(a, function (val, index, a2) {
+        expect(a).to.equal(a2);
+        expect(typeof index).to.be('number');
+        return val > 1;
+      });
+      expect(b).to.be(2);
+    });
+
+    it('returns null when an item in an array is not found', function () {
+      const a = [0, 1, 2, 3];
+      const b = find(a, function (val, index, a2) {
+        return val > 100;
+      });
+      expect(b).to.be(null);
+    });
+
+    it('finds items in an array-like', function () {
+      const a = 'abCD';
+      const b = find(a, function (val, index, a2) {
+        expect(a).to.equal(a2);
+        expect(typeof index).to.be('number');
+        return val >= 'A' && val <= 'Z';
+      });
+      expect(b).to.be('C');
+    });
+
+    it('returns null when nothing in an array-like is found', function () {
+      const a = 'abcd';
+      const b = find(a, function (val, index, a2) {
+        return val >= 'A' && val <= 'Z';
+      });
+      expect(b).to.be(null);
+    });
+  });
+
+  describe('findIndex', function () {
+    it('finds index of numbers in an array', function () {
+      const a = [0, 1, 2, 3];
+      const b = findIndex(a, function (val, index, a2) {
+        expect(a).to.equal(a2);
+        expect(typeof index).to.be('number');
+        return val > 1;
+      });
+      expect(b).to.be(2);
+    });
+
+    it('returns -1 when an item in an array is not found', function () {
+      const a = [0, 1, 2, 3];
+      const b = findIndex(a, function (val, index, a2) {
+        return val > 100;
+      });
+      expect(b).to.be(-1);
+    });
+  });
+
+  describe('isSorted', function () {
+    it('works with just an array as argument', function () {
+      expect(isSorted([1, 2, 3])).to.be(true);
+      expect(isSorted([1, 2, 2])).to.be(true);
+      expect(isSorted([1, 2, 1])).to.be(false);
+    });
+
+    it('works with strict comparison without compare function', function () {
+      expect(isSorted([1, 2, 3], null, true)).to.be(true);
+      expect(isSorted([1, 2, 2], null, true)).to.be(false);
+      expect(isSorted([1, 2, 1], null, true)).to.be(false);
+    });
+
+    it('works with a compare function', function () {
+      function compare(a, b) {
+        return b - a;
+      }
+      expect(isSorted([1, 2, 3], compare)).to.be(false);
+      expect(isSorted([3, 2, 2], compare)).to.be(true);
+    });
+  });
+
+  describe('linearFindNearest', function () {
+    it('returns expected value', function () {
+      const arr = [1000, 500, 100];
+
+      expect(linearFindNearest(arr, 10000, 0)).to.eql(0);
+      expect(linearFindNearest(arr, 10000, 1)).to.eql(0);
+      expect(linearFindNearest(arr, 10000, -1)).to.eql(0);
+
+      expect(linearFindNearest(arr, 1000, 0)).to.eql(0);
+      expect(linearFindNearest(arr, 1000, 1)).to.eql(0);
+      expect(linearFindNearest(arr, 1000, -1)).to.eql(0);
+
+      expect(linearFindNearest(arr, 900, 0)).to.eql(0);
+      expect(linearFindNearest(arr, 900, 1)).to.eql(0);
+      expect(linearFindNearest(arr, 900, -1)).to.eql(1);
+
+      expect(linearFindNearest(arr, 750, 0)).to.eql(1);
+      expect(linearFindNearest(arr, 750, 1)).to.eql(0);
+      expect(linearFindNearest(arr, 750, -1)).to.eql(1);
+
+      expect(linearFindNearest(arr, 550, 0)).to.eql(1);
+      expect(linearFindNearest(arr, 550, 1)).to.eql(0);
+      expect(linearFindNearest(arr, 550, -1)).to.eql(1);
+
+      expect(linearFindNearest(arr, 500, 0)).to.eql(1);
+      expect(linearFindNearest(arr, 500, 1)).to.eql(1);
+      expect(linearFindNearest(arr, 500, -1)).to.eql(1);
+
+      expect(linearFindNearest(arr, 450, 0)).to.eql(1);
+      expect(linearFindNearest(arr, 450, 1)).to.eql(1);
+      expect(linearFindNearest(arr, 450, -1)).to.eql(2);
+
+      expect(linearFindNearest(arr, 300, 0)).to.eql(2);
+      expect(linearFindNearest(arr, 300, 1)).to.eql(1);
+      expect(linearFindNearest(arr, 300, -1)).to.eql(2);
+
+      expect(linearFindNearest(arr, 200, 0)).to.eql(2);
+      expect(linearFindNearest(arr, 200, 1)).to.eql(1);
+      expect(linearFindNearest(arr, 200, -1)).to.eql(2);
+
+      expect(linearFindNearest(arr, 100, 0)).to.eql(2);
+      expect(linearFindNearest(arr, 100, 1)).to.eql(2);
+      expect(linearFindNearest(arr, 100, -1)).to.eql(2);
+
+      expect(linearFindNearest(arr, 50, 0)).to.eql(2);
+      expect(linearFindNearest(arr, 50, 1)).to.eql(2);
+      expect(linearFindNearest(arr, 50, -1)).to.eql(2);
+    });
+  });
+
+  describe('numberSafeCompareFunction', function () {
+    it('sorts as expected', function () {
+      const arr = [40, 200, 3000];
+      // default sort would yield [200, 3000, 40]
+      arr.sort(numberSafeCompareFunction);
+      expect(arr).to.eql(arr);
+    });
+  });
+
+  describe('remove', function () {
+    it('removes elements from an array', function () {
+      const a = ['a', 'b', 'c', 'd'];
+      remove(a, 'c');
+      expect(a).to.eql(['a', 'b', 'd']);
+      remove(a, 'x');
+      expect(a).to.eql(['a', 'b', 'd']);
+    });
+  });
+
+  describe('reverseSubArray', function () {
+    it('returns expected value', function () {
+      let arr;
+      const expected = [1, 2, 3, 4, 5, 6];
+
+      arr = [1, 5, 4, 3, 2, 6];
+      reverseSubArray(arr, 1, 4);
+      expect(arr).to.eql(expected);
+
+      arr = [3, 2, 1, 4, 5, 6];
+      reverseSubArray(arr, 0, 2);
+      expect(arr).to.eql(expected);
+
+      arr = [1, 2, 3, 6, 5, 4];
+      reverseSubArray(arr, 3, 5);
+      expect(arr).to.eql(expected);
+
+      arr = [6, 5, 4, 3, 2, 1];
+      reverseSubArray(arr, 0, 5);
+      expect(arr).to.eql(expected);
+    });
+  });
+
+  describe('stableSort', function () {
+    let arr, wantedSortedValues;
+
+    beforeEach(function () {
+      arr = [
+        {key: 3, val: 'a'},
+        {key: 2, val: 'b'},
+        {key: 3, val: 'c'},
+        {key: 4, val: 'd'},
+        {key: 3, val: 'e'},
+      ];
+      wantedSortedValues = ['b', 'a', 'c', 'e', 'd'];
+    });
+
+    it('works on an array with custom comparison function', function () {
+      function comparisonFn(obj1, obj2) {
+        return obj1.key - obj2.key;
+      }
+      stableSort(arr, comparisonFn);
+      const sortedValues = [];
+      for (let i = 0; i < arr.length; i++) {
+        sortedValues.push(arr[i].val);
+      }
+      expect(wantedSortedValues).to.eql(sortedValues);
+    });
+  });
+});

test/node/ol/asserts.test.js

@@ -0,0 +1,12 @@
+import expect from '../expect.js';
+import {assert} from '../../../src/ol/asserts.js';
+
+describe('ol/asserts.js', function () {
+  describe('assert', function () {
+    it('throws an exception', function () {
+      expect(function () {
+        assert(false, 42);
+      }).to.throwException();
+    });
+  });
+});

test/node/ol/coordinate.test.js

@@ -1,5 +1,6 @@
-import Circle from '../../../../src/ol/geom/Circle.js';
+import Circle from '../../../src/ol/geom/Circle.js';
-import Projection from '../../../../src/ol/proj/Projection.js';
+import Projection from '../../../src/ol/proj/Projection.js';
+import expect from '../expect.js';
 import {
   add as addCoordinate,
   closestOnCircle,
@@ -13,8 +14,8 @@ import {
   toStringHDMS,
   toStringXY,
   wrapX,
-} from '../../../../src/ol/coordinate.js';
+} from '../../../src/ol/coordinate.js';
-import {get} from '../../../../src/ol/proj.js';
+import {get} from '../../../src/ol/proj.js';
 
 describe('ol.coordinate', function () {
   describe('#add', function () {

test/node/ol/css.test.js

@@ -1,4 +1,5 @@
-import {getFontParameters} from '../../../../src/ol/css.js';
+import expect from '../expect.js';
+import {getFontParameters} from '../../../src/ol/css.js';
 
 describe('ol.css', function () {
   describe('getFontParameters()', function () {

test/node/ol/events.test.js

@@ -1,7 +1,9 @@
-import EventTarget from '../../../../src/ol/events/Target.js';
+import EventTarget from '../../../src/ol/events/Target.js';
-import {listen, listenOnce, unlistenByKey} from '../../../../src/ol/events.js';
+import expect from '../expect.js';
+import sinon from 'sinon';
+import {listen, listenOnce, unlistenByKey} from '../../../src/ol/events.js';
 
-describe('ol.events', function () {
+describe('ol/events.js', function () {
   let add, target;
 
   beforeEach(function () {

test/node/ol/events/Target.test.js

@@ -1,9 +1,10 @@
-import Disposable from '../../../../../src/ol/Disposable.js';
+import Disposable from '../../../../src/ol/Disposable.js';
-import Event from '../../../../../src/ol/events/Event.js';
+import Event from '../../../../src/ol/events/Event.js';
-import EventTarget from '../../../../../src/ol/events/Target.js';
+import EventTarget from '../../../../src/ol/events/Target.js';
-import {listen} from '../../../../../src/ol/events.js';
+import expect from '../../expect.js';
+import {listen} from '../../../../src/ol/events.js';
 
-describe('ol.events.EventTarget', function () {
+describe('ol/events/Target.js', function () {
   let called, events, eventTarget, spy1, spy2, spy3;
 
   beforeEach(function () {
@@ -166,7 +167,7 @@ describe('ol.events.EventTarget', function () {
 
   describe('#dispose()', function () {
     it('cleans up foreign references', function () {
-      listen(eventTarget, 'foo', spy1, document);
+      listen(eventTarget, 'foo', spy1);
       expect(eventTarget.hasListener('foo')).to.be(true);
       eventTarget.dispose();
       expect(eventTarget.hasListener('foo')).to.be(false);

test/node/ol/events/event.test.js

@@ -1,9 +1,11 @@
 import Event, {
   preventDefault,
   stopPropagation,
-} from '../../../../../src/ol/events/Event.js';
+} from '../../../../src/ol/events/Event.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
 
-describe('ol.events.Event', function () {
+describe('ol/events/Event.js', function () {
   describe('constructor', function () {
     it('takes a type as argument', function () {
       const event = new Event('foo');

test/node/ol/extent.test.js

@@ -1,8 +1,11 @@
-import * as _ol_extent_ from '../../../../src/ol/extent.js';
+import * as _ol_extent_ from '../../../src/ol/extent.js';
-import {get, getTransform} from '../../../../src/ol/proj.js';
+import expect from '../expect.js';
-import {register} from '../../../../src/ol/proj/proj4.js';
+import proj4 from 'proj4';
+import sinon from 'sinon';
+import {get, getTransform} from '../../../src/ol/proj.js';
+import {register} from '../../../src/ol/proj/proj4.js';
 
-describe('ol.extent', function () {
+describe('ol/extent.js', function () {
   describe('buffer', function () {
     it('buffers an extent by some value', function () {
       const extent = [-10, -20, 10, 20];

test/node/ol/functions.test.js

@@ -1,6 +1,7 @@
-import {memoizeOne} from '../../../../src/ol/functions.js';
+import expect from '../expect.js';
+import {memoizeOne} from '../../../src/ol/functions.js';
 
-describe('ol/functions', function () {
+describe('ol/functions.js', function () {
   describe('memoizeOne()', function () {
     it('returns the result from the first call when called a second time with the same args', function () {
       const arg1 = {};

test/node/ol/geom/Circle.test.js

@@ -1,6 +1,8 @@
-import Circle from '../../../../../src/ol/geom/Circle.js';
+import Circle from '../../../../src/ol/geom/Circle.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
 
-describe('ol.geom.Circle', function () {
+describe('ol/geom/Circle.js', function () {
   describe('with a unit circle', function () {
     let circle;
     beforeEach(function () {

test/node/ol/geom/GeometryCollection.test.js

@@ -1,10 +1,12 @@
-import Geometry from '../../../../../src/ol/geom/Geometry.js';
+import Geometry from '../../../../src/ol/geom/Geometry.js';
-import GeometryCollection from '../../../../../src/ol/geom/GeometryCollection.js';
+import GeometryCollection from '../../../../src/ol/geom/GeometryCollection.js';
-import LineString from '../../../../../src/ol/geom/LineString.js';
+import LineString from '../../../../src/ol/geom/LineString.js';
-import Point from '../../../../../src/ol/geom/Point.js';
+import Point from '../../../../src/ol/geom/Point.js';
-import Polygon from '../../../../../src/ol/geom/Polygon.js';
+import Polygon from '../../../../src/ol/geom/Polygon.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
 
-describe('ol.geom.GeometryCollection', function () {
+describe('ol/geom/GeometryCollection.js', function () {
   const outer = [
     [0, 0],
     [0, 10],

test/node/ol/geom/LineString.test.js

@@ -1,7 +1,9 @@
-import LineString from '../../../../../src/ol/geom/LineString.js';
+import LineString from '../../../../src/ol/geom/LineString.js';
-import {isEmpty} from '../../../../../src/ol/extent.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
+import {isEmpty} from '../../../../src/ol/extent.js';
 
-describe('ol.geom.LineString', function () {
+describe('ol/geom/LineString.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new LineString(null);

test/node/ol/geom/MultiLineString.test.js

@@ -1,8 +1,9 @@
-import LineString from '../../../../../src/ol/geom/LineString.js';
+import LineString from '../../../../src/ol/geom/LineString.js';
-import MultiLineString from '../../../../../src/ol/geom/MultiLineString.js';
+import MultiLineString from '../../../../src/ol/geom/MultiLineString.js';
-import {isEmpty} from '../../../../../src/ol/extent.js';
+import expect from '../../expect.js';
+import {isEmpty} from '../../../../src/ol/extent.js';
 
-describe('ol.geom.MultiLineString', function () {
+describe('ol/geom/MultiLineString.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new MultiLineString(null);

test/node/ol/geom/MultiPoint.test.js

@@ -1,8 +1,10 @@
-import MultiPoint from '../../../../../src/ol/geom/MultiPoint.js';
+import MultiPoint from '../../../../src/ol/geom/MultiPoint.js';
-import Point from '../../../../../src/ol/geom/Point.js';
+import Point from '../../../../src/ol/geom/Point.js';
-import {isEmpty} from '../../../../../src/ol/extent.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
+import {isEmpty} from '../../../../src/ol/extent.js';
 
-describe('ol.geom.MultiPoint', function () {
+describe('ol/geom/MultiPoint.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new MultiPoint(null);

test/node/ol/geom/MultiPolygon.test.js

@@ -1,7 +1,8 @@
-import MultiPolygon from '../../../../../src/ol/geom/MultiPolygon.js';
+import MultiPolygon from '../../../../src/ol/geom/MultiPolygon.js';
-import Polygon from '../../../../../src/ol/geom/Polygon.js';
+import Polygon from '../../../../src/ol/geom/Polygon.js';
+import expect from '../../expect.js';
 
-describe('ol.geom.MultiPolygon', function () {
+describe('ol/geom/MultiPolygon.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new MultiPolygon(null);

test/node/ol/geom/Point.test.js

@@ -1,10 +1,12 @@
-import Point from '../../../../../src/ol/geom/Point.js';
+import Point from '../../../../src/ol/geom/Point.js';
+import expect from '../../expect.js';
+import sinon from 'sinon';
 import {
   get as getProjection,
   getTransformFromProjections,
-} from '../../../../../src/ol/proj.js';
+} from '../../../../src/ol/proj.js';
 
-describe('ol.geom.Point', function () {
+describe('ol/geom/Point.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new Point(null);

test/node/ol/geom/Polygon.test.js

@@ -1,12 +1,13 @@
-import Circle from '../../../../../src/ol/geom/Circle.js';
+import Circle from '../../../../src/ol/geom/Circle.js';
-import LinearRing from '../../../../../src/ol/geom/LinearRing.js';
+import LinearRing from '../../../../src/ol/geom/LinearRing.js';
 import Polygon, {
   fromCircle,
   fromExtent,
-} from '../../../../../src/ol/geom/Polygon.js';
+} from '../../../../src/ol/geom/Polygon.js';
-import {boundingExtent, isEmpty} from '../../../../../src/ol/extent.js';
+import expect from '../../expect.js';
+import {boundingExtent, isEmpty} from '../../../../src/ol/extent.js';
 
-describe('ol/geom/Polygon', function () {
+describe('ol/geom/Polygon.js', function () {
   it('cannot be constructed with a null geometry', function () {
     expect(function () {
       return new Polygon(null);

test/node/ol/geom/flat/area.test.js

@@ -1,10 +1,8 @@
-import {
+import expect from '../../../expect.js';
-  linearRing,
+import {linearRing, linearRings} from '../../../../../src/ol/geom/flat/area.js';
-  linearRings,
-} from '../../../../../../src/ol/geom/flat/area.js';
 
-describe('ol.geom.flat.area', function () {
+describe('ol/geom/flat/area.js', function () {
-  describe('ol.geom.flat.area.linearRing', function () {
+  describe('linearRing', function () {
     it('calculates the area of a triangle', function () {
       const area = linearRing([0, 0, 0.5, 1, 1, 0], 0, 6, 2);
       expect(area).to.be(0.5);
@@ -16,7 +14,7 @@ describe('ol.geom.flat.area', function () {
     });
   });
 
-  describe('ol.geom.flat.area.linearRings', function () {
+  describe('linearRings', function () {
     it('calculates the area with holes', function () {
       const area = linearRings(
         [0, 0, 0, 3, 3, 3, 3, 0, 1, 1, 2, 1, 2, 2, 1, 2],

test/node/ol/geom/flat/center.test.js

@@ -1,8 +1,9 @@
-import MultiPolygon from '../../../../../../src/ol/geom/MultiPolygon.js';
+import MultiPolygon from '../../../../../src/ol/geom/MultiPolygon.js';
-import {linearRingss as linearRingssCenter} from '../../../../../../src/ol/geom/flat/center.js';
+import expect from '../../../expect.js';
+import {linearRingss as linearRingssCenter} from '../../../../../src/ol/geom/flat/center.js';
 
-describe('ol.geom.flat.center', function () {
+describe('ol/geom/flat/center.js', function () {
-  describe('ol.geom.flat.center.linearRingss', function () {
+  describe('linearRingss', function () {
     it('calculates the center of a square', function () {
       const squareMultiPoly = new MultiPolygon([
         [

test/node/ol/geom/flat/closest.test.js

@@ -1,13 +1,14 @@
+import expect from '../../../expect.js';
 import {
   assignClosestPoint,
   maxSquaredDelta,
-} from '../../../../../../src/ol/geom/flat/closest.js';
+} from '../../../../../src/ol/geom/flat/closest.js';
 
-describe('ol.geom.flat.closest', function () {
+describe('ol/geom/flat/closest.js', function () {
   describe('with simple data', function () {
     const flatCoordinates = [0, 0, 1, 0, 3, 0, 5, 0, 6, 0, 8, 0, 11, 0];
 
-    describe('ol.geom.flat.closest.maxSquaredDelta', function () {
+    describe('maxSquaredDelta', function () {
       it('returns the expected value in simple cases', function () {
         expect(
           maxSquaredDelta(flatCoordinates, 0, flatCoordinates.length, 2, 0)
@@ -15,7 +16,7 @@ describe('ol.geom.flat.closest', function () {
       });
     });
 
-    describe('ol.geom.flat.closest.assignClosestPoint', function () {
+    describe('assignClosestPoint', function () {
       it('returns the expected value', function () {
         const maxDelta = Math.sqrt(
           maxSquaredDelta(flatCoordinates, 0, flatCoordinates.length, 2, 0)
@@ -290,7 +291,7 @@ describe('ol.geom.flat.closest', function () {
       480.77,
     ];
 
-    describe('ol.geom.closest.maxSquaredDelta', function () {
+    describe('maxSquaredDelta', function () {
       it('returns the expected value', function () {
         expect(
           maxSquaredDelta(flatCoordinates, 0, flatCoordinates.length, 2, 0)
@@ -298,7 +299,7 @@ describe('ol.geom.flat.closest', function () {
       });
     });
 
-    describe('ol.geom.flat.closest.assignClosestPoint', function () {
+    describe('assignClosestPoint', function () {
       it('returns the expected value', function () {
         const maxDelta = Math.sqrt(
           maxSquaredDelta(flatCoordinates, 0, flatCoordinates.length, 2, 0)
@@ -358,7 +359,7 @@ describe('ol.geom.flat.closest', function () {
     const flatCoordinates = [0, 0, 10, -10, 2, 2, 30, -20];
     const stride = 4;
 
-    describe('ol.geom.flat.closest.assignClosestPoint', function () {
+    describe('assignClosestPoint', function () {
       it('interpolates M coordinates', function () {
         const maxDelta = Math.sqrt(
           maxSquaredDelta(flatCoordinates, 0, flatCoordinates.length, stride, 0)

test/node/ol/geom/flat/contains.test.js

@@ -1,6 +1,7 @@
-import {linearRingContainsXY} from '../../../../../../src/ol/geom/flat/contains.js';
+import expect from '../../../expect.js';
+import {linearRingContainsXY} from '../../../../../src/ol/geom/flat/contains.js';
 
-describe('ol.geom.flat.contains', function () {
+describe('ol/geom/flat/contains.js', function () {
   describe('with simple data', function () {
     const flatCoordinatesSimple = [0, 0, 1, 0, 1, 1, 0, 1];
     const flatCoordinatesNonSimple = [
@@ -26,7 +27,7 @@ describe('ol.geom.flat.contains', function () {
       4,
     ];
 
-    describe('ol.geom.flat.contains.linearRingContainsXY', function () {
+    describe('linearRingContainsXY', function () {
       it('returns true for point inside a simple polygon', function () {
         expect(
           linearRingContainsXY(

test/node/ol/geom/flat/deflate.test.js

@@ -1,10 +1,11 @@
+import expect from '../../../expect.js';
 import {
   deflateCoordinates,
   deflateCoordinatesArray,
-} from '../../../../../../src/ol/geom/flat/deflate.js';
+} from '../../../../../src/ol/geom/flat/deflate.js';
 
-describe('ol.geom.flat.deflate', function () {
+describe('ol/geom/flat/deflate.js', function () {
-  describe('ol.geom.flat.deflate.deflateCoordinates', function () {
+  describe('deflateCoordinates', function () {
     let flatCoordinates;
     beforeEach(function () {
       flatCoordinates = [];
@@ -25,7 +26,7 @@ describe('ol.geom.flat.deflate', function () {
     });
   });
 
-  describe('ol.geom.flat.deflate.deflateCoordinatesArray', function () {
+  describe('deflateCoordinatesArray', function () {
     let flatCoordinates;
     beforeEach(function () {
       flatCoordinates = [];

test/node/ol/geom/flat/flip.test.js

@@ -1,7 +1,8 @@
-import {flipXY} from '../../../../../../src/ol/geom/flat/flip.js';
+import expect from '../../../expect.js';
+import {flipXY} from '../../../../../src/ol/geom/flat/flip.js';
 
-describe('ol.geom.flat.flip', function () {
+describe('ol/geom/flat/flip.js', function () {
-  describe('ol.geom.flat.flip.flipXY', function () {
+  describe('flipXY', function () {
     it('can flip XY coordinates', function () {
       const flatCoordinates = flipXY([1, 2, 3, 4], 0, 4, 2);
       expect(flatCoordinates).to.eql([2, 1, 4, 3]);

test/node/ol/geom/flat/inflate.test.js

@@ -1,10 +1,11 @@
+import expect from '../../../expect.js';
 import {
   inflateCoordinates,
   inflateCoordinatesArray,
-} from '../../../../../../src/ol/geom/flat/inflate.js';
+} from '../../../../../src/ol/geom/flat/inflate.js';
 
-describe('ol.geom.flat.inflate', function () {
+describe('ol/geom/flat/inflate.js', function () {
-  describe('ol.geom.flat.inflate.inflateCoordinates', function () {
+  describe('inflateCoordinates', function () {
     it('inflates coordinates', function () {
       const coordinates = inflateCoordinates([1, 2, 3, 4], 0, 4, 2);
       expect(coordinates).to.eql([
@@ -14,7 +15,7 @@ describe('ol.geom.flat.inflate', function () {
     });
   });
 
-  describe('ol.geom.flat.inflate.inflateCoordinatesArray', function () {
+  describe('inflateCoordinatesArray', function () {
     it('inflates arrays of coordinates', function () {
       const coordinatess = inflateCoordinatesArray(
         [1, 2, 3, 4, 5, 6, 7, 8],

test/node/ol/geom/flat/interpolate.test.js

@@ -1,7 +1,8 @@
-import {interpolatePoint} from '../../../../../../src/ol/geom/flat/interpolate.js';
+import expect from '../../../expect.js';
+import {interpolatePoint} from '../../../../../src/ol/geom/flat/interpolate.js';
 
-describe('ol.geom.flat.interpolate', function () {
+describe('ol/geom/flat/interpolate.js', function () {
-  describe('ol.geom.flat.interpolate.interpolatePoint', function () {
+  describe('interpolatePoint', function () {
     it('returns the expected value for single points', function () {
       const flatCoordinates = [0, 1];
       const point = interpolatePoint(flatCoordinates, 0, 2, 2, 0.5);

test/node/ol/geom/flat/intersectsextent.test.js

@@ -1,11 +1,12 @@
+import expect from '../../../expect.js';
 import {
   intersectsLineString,
   intersectsLinearRing,
   intersectsLinearRingArray,
-} from '../../../../../../src/ol/geom/flat/intersectsextent.js';
+} from '../../../../../src/ol/geom/flat/intersectsextent.js';
 
-describe('ol.geom.flat.intersectsextent', function () {
+describe('ol/geom/flat/intersectsextent.js', function () {
-  describe('ol.geom.flat.intersectsextent.intersectsLineString', function () {
+  describe('intersectsLineString', function () {
     let flatCoordinates;
     beforeEach(function () {
       flatCoordinates = [0, 0, 1, 1, 2, 2];
@@ -88,7 +89,7 @@ describe('ol.geom.flat.intersectsextent', function () {
     });
   });
 
-  describe('ol.geom.flat.intersectsextent.intersectsLinearRing', function () {
+  describe('intersectsLinearRing', function () {
     let flatCoordinates;
     beforeEach(function () {
       flatCoordinates = [0, 0, 1, 1, 2, 0, 1, -1, 0, 0];
@@ -138,7 +139,7 @@ describe('ol.geom.flat.intersectsextent', function () {
     });
   });
 
-  describe('ol.geom.flat.intersectsextent.intersectsLinearRingArray', function () {
+  describe('intersectsLinearRingArray', function () {
     let flatCoordinates;
     let ends;
     beforeEach(function () {

test/node/ol/geom/flat/length.test.js

@@ -1,10 +1,11 @@
+import expect from '../../../expect.js';
 import {
   lineStringLength,
   linearRingLength,
-} from '../../../../../../src/ol/geom/flat/length.js';
+} from '../../../../../src/ol/geom/flat/length.js';
 
-describe('ol.geom.flat.length', function () {
+describe('ol/geom/flat/length.js', function () {
-  describe('ol.geom.flat.length.lineStringLength', function () {
+  describe('lineStringLength', function () {
     describe('stride = 2', function () {
       const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1];
       const stride = 2;
@@ -64,7 +65,7 @@ describe('ol.geom.flat.length', function () {
     });
   });
 
-  describe('ol.geom.flat.length.linearRingLength', function () {
+  describe('linearRingLength', function () {
     it('calculates the total length of a simple linearRing', function () {
       const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1];
       const stride = 2;

test/node/ol/geom/flat/orient.test.js

@@ -1,13 +1,14 @@
+import expect from '../../../expect.js';
 import {
   linearRingIsClockwise,
   linearRingsAreOriented,
   linearRingssAreOriented,
   orientLinearRings,
   orientLinearRingsArray,
-} from '../../../../../../src/ol/geom/flat/orient.js';
+} from '../../../../../src/ol/geom/flat/orient.js';
 
-describe('ol.geom.flat.orient', function () {
+describe('ol/geom/flat/orient.js', function () {
-  describe('ol.geom.flat.orient.linearRingIsClockwise', function () {
+  describe('linearRingIsClockwise', function () {
     it('identifies clockwise rings', function () {
       const flatCoordinates = [0, 1, 1, 4, 4, 3, 3, 0];
       const isClockwise = linearRingIsClockwise(
@@ -86,7 +87,7 @@ describe('ol.geom.flat.orient', function () {
     });
   });
 
-  describe('ol.geom.flat.orient.linearRingsAreOriented', function () {
+  describe('linearRingsAreOriented', function () {
     const oriented = linearRingsAreOriented;
 
     const rightCoords = [
@@ -148,7 +149,7 @@ describe('ol.geom.flat.orient', function () {
     });
   });
 
-  describe('ol.geom.flat.orient.linearRingssAreOriented', function () {
+  describe('linearRingssAreOriented', function () {
     const oriented = linearRingssAreOriented;
 
     const rightCoords = [
@@ -253,7 +254,7 @@ describe('ol.geom.flat.orient', function () {
     });
   });
 
-  describe('ol.geom.flat.orient.orientLinearRings', function () {
+  describe('orientLinearRings', function () {
     const orient = orientLinearRings;
 
     const rightCoords = [
@@ -325,7 +326,7 @@ describe('ol.geom.flat.orient', function () {
     });
   });
 
-  describe('ol.geom.flat.orient.orientLinearRingsArray', function () {
+  describe('orientLinearRingsArray', function () {
     const orient = orientLinearRingsArray;
 
     const rightCoords = [

test/node/ol/geom/flat/reverse.test.js

@@ -1,7 +1,8 @@
-import {coordinates as reverseCoordinates} from '../../../../../../src/ol/geom/flat/reverse.js';
+import expect from '../../../expect.js';
+import {coordinates as reverseCoordinates} from '../../../../../src/ol/geom/flat/reverse.js';
 
-describe('ol.geom.flat.reverse', function () {
+describe('ol/geom/flat/reverse.js', function () {
-  describe('ol.geom.flat.reverse.coordinates', function () {
+  describe('coordinates', function () {
     describe('with a stride of 2', function () {
       it('can reverse empty flat coordinates', function () {
         const flatCoordinates = [];

test/node/ol/geom/flat/segments.test.js

@@ -1,7 +1,9 @@
-import {forEach as forEachSegment} from '../../../../../../src/ol/geom/flat/segments.js';
+import expect from '../../../expect.js';
+import sinon from 'sinon';
+import {forEach as forEachSegment} from '../../../../../src/ol/geom/flat/segments.js';
 
-describe('ol.geom.flat.segments', function () {
+describe('ol/geom/flat/segments.js', function () {
-  describe('ol.geom.flat.segments.forEach', function () {
+  describe('forEach', function () {
     let flatCoordinates, offset, end, stride;
     beforeEach(function () {
       flatCoordinates = [0, 0, 1, 1, 2, 2, 3, 3];

test/node/ol/geom/flat/simplify.test.js

@@ -1,11 +1,12 @@
+import expect from '../../../expect.js';
 import {
   douglasPeucker,
   quantize,
   radialDistance,
   simplifyLineString,
-} from '../../../../../../src/ol/geom/flat/simplify.js';
+} from '../../../../../src/ol/geom/flat/simplify.js';
 
-describe('ol.geom.flat.simplify', function () {
+describe('ol/geom/flat/simplify.js', function () {
   const flatCoordinates = [
     224.55,
     250.15,
@@ -532,7 +533,7 @@ describe('ol.geom.flat.simplify', function () {
     480.77,
   ];
 
-  describe('ol.geom.flat.simplify.simplifyLineString', function () {
+  describe('simplifyLineString', function () {
     it('works with empty line strings', function () {
       expect(simplifyLineString([], 0, 0, 2, 1, true)).to.eql([]);
       expect(simplifyLineString([], 0, 0, 2, 1, false)).to.eql([]);
@@ -570,7 +571,7 @@ describe('ol.geom.flat.simplify', function () {
     });
   });
 
-  describe('ol.geom.flat.simplify.radialDistance', function () {
+  describe('radialDistance', function () {
     let dest;
     beforeEach(function () {
       dest = [];
@@ -673,7 +674,7 @@ describe('ol.geom.flat.simplify', function () {
     });
   });
 
-  describe('ol.geom.flat.simplify.douglasPeucker', function () {
+  describe('douglasPeucker', function () {
     let dest;
     beforeEach(function () {
       dest = [];
@@ -809,7 +810,7 @@ describe('ol.geom.flat.simplify', function () {
     });
   });
 
-  describe('ol.geom.flat.simplify.quantize', function () {
+  describe('quantize', function () {
     it('handles empty coordinates', function () {
       const simplifiedFlatCoordinates = [];
       expect(quantize([], 0, 0, 2, 2, simplifiedFlatCoordinates, 0)).to.be(0);

test/node/ol/geom/flat/straightchunk.test.js

@@ -1,7 +1,8 @@
-import {matchingChunk} from '../../../../../../src/ol/geom/flat/straightchunk.js';
+import expect from '../../../expect.js';
+import {matchingChunk} from '../../../../../src/ol/geom/flat/straightchunk.js';
 
-describe('ol.geom.flat.straightchunk', function () {
+describe('ol/geom/flat/straightchunk.js', function () {
-  describe('ol.geom.flat.straightchunk.matchingChunk', function () {
+  describe('matchingChunk', function () {
     describe('single segment with stride == 3', function () {
       const flatCoords = [0, 0, 42, 1, 1, 42];
       const stride = 3;

test/node/ol/geom/flat/textpath.test.js

@@ -1,7 +1,8 @@
-import {drawTextOnPath} from '../../../../../../src/ol/geom/flat/textpath.js';
+import expect from '../../../expect.js';
-import {lineStringLength} from '../../../../../../src/ol/geom/flat/length.js';
+import {drawTextOnPath} from '../../../../../src/ol/geom/flat/textpath.js';
+import {lineStringLength} from '../../../../../src/ol/geom/flat/length.js';
 
-describe('ol.geom.flat.drawTextOnPath', function () {
+describe('ol/geom/flat/drawTextOnPath.js', function () {
   const horizontal = [0, 0, 100, 0];
   const vertical = [0, 0, 0, 100];
   const diagonal = [0, 0, 100, 100];

test/node/ol/geom/flat/topologyflatgeom.test.js

@@ -1,7 +1,8 @@
-import {lineStringIsClosed} from '../../../../../../src/ol/geom/flat/topology.js';
+import expect from '../../../expect.js';
+import {lineStringIsClosed} from '../../../../../src/ol/geom/flat/topology.js';
 
-describe('ol.geom.flat.topology', function () {
+describe('ol/geom/flat/topology.js', function () {
-  describe('ol.geom.flat.topology.lineStringIsClosed', function () {
+  describe('lineStringIsClosed', function () {
     it('identifies closed lines aka boundaries', function () {
       const flatCoordinates = [0, 0, 3, 0, 0, 3, 0, 0];
       const isClosed = lineStringIsClosed(

test/node/ol/geom/flat/transform.test.js

@@ -1,12 +1,10 @@
-import MultiPolygon from '../../../../../../src/ol/geom/MultiPolygon.js';
+import MultiPolygon from '../../../../../src/ol/geom/MultiPolygon.js';
-import {
+import expect from '../../../expect.js';
-  rotate,
+import {rotate, translate} from '../../../../../src/ol/geom/flat/transform.js';
-  translate,
+import {transformGeom2D} from '../../../../../src/ol/geom/SimpleGeometry.js';
-} from '../../../../../../src/ol/geom/flat/transform.js';
-import {transformGeom2D} from '../../../../../../src/ol/geom/SimpleGeometry.js';
 
-describe('ol.geom.flat.transform', function () {
+describe('ol/geom/flat/transform.js', function () {
-  describe('ol.geom.flat.transform.transform2D', function () {
+  describe('transform2D', function () {
     it('transforms a Simple Geometry to 2D', function () {
       const multiPolygonGeometry = new MultiPolygon([
         [
@@ -79,7 +77,7 @@ describe('ol.geom.flat.transform', function () {
     });
   });
 
-  describe('ol.geom.flat.transform.translate', function () {
+  describe('translate', function () {
     it('translates the coordinates array', function () {
       const multiPolygon = new MultiPolygon([
         [
@@ -148,7 +146,7 @@ describe('ol.geom.flat.transform', function () {
     });
   });
 
-  describe('ol.geom.flat.transform.rotate', function () {
+  describe('rotate', function () {
     it('rotates the coordinates array', function () {
       const multiPolygon = new MultiPolygon([
         [

test/node/ol/math.test.js

@@ -0,0 +1,165 @@
+import expect from '../expect.js';
+import {
+  clamp,
+  cosh,
+  lerp,
+  log2,
+  modulo,
+  solveLinearSystem,
+  toDegrees,
+  toRadians,
+} from '../../../src/ol/math.js';
+
+describe('ol/math.js', () => {
+  describe('clamp', function () {
+    it('returns the correct value at -Infinity', function () {
+      expect(clamp(-Infinity, 10, 20)).to.eql(10);
+    });
+
+    it('returns the correct value at min', function () {
+      expect(clamp(10, 10, 20)).to.eql(10);
+    });
+
+    it('returns the correct value at mid point', function () {
+      expect(clamp(15, 10, 20)).to.eql(15);
+    });
+
+    it('returns the correct value at max', function () {
+      expect(clamp(20, 10, 20)).to.eql(20);
+    });
+
+    it('returns the correct value at Infinity', function () {
+      expect(clamp(Infinity, 10, 20)).to.eql(20);
+    });
+  });
+
+  describe('cosh', function () {
+    it('returns the correct value at -Infinity', function () {
+      expect(cosh(-Infinity)).to.eql(Infinity);
+    });
+
+    it('returns the correct value at -1', function () {
+      expect(cosh(-1)).to.roughlyEqual(1.5430806348152437, 1e-9);
+    });
+
+    it('returns the correct value at 0', function () {
+      expect(cosh(0)).to.eql(1);
+    });
+
+    it('returns the correct value at 1', function () {
+      expect(cosh(1)).to.roughlyEqual(1.5430806348152437, 1e-9);
+    });
+
+    it('returns the correct value at Infinity', function () {
+      expect(cosh(Infinity)).to.eql(Infinity);
+    });
+  });
+
+  describe('log2', function () {
+    it('returns the correct value at Infinity', function () {
+      expect(log2(Infinity)).to.eql(Infinity);
+    });
+
+    it('returns the correct value at 3', function () {
+      expect(log2(3)).to.roughlyEqual(1.584962500721156, 1e-9);
+    });
+
+    it('returns the correct value at 2', function () {
+      expect(log2(2)).to.eql(1);
+    });
+
+    it('returns the correct value at 1', function () {
+      expect(log2(1)).to.eql(0);
+    });
+
+    it('returns the correct value at 0', function () {
+      expect(log2(0)).to.eql(-Infinity);
+    });
+
+    it('returns the correct value at -1', function () {
+      expect(log2(-1).toString()).to.eql('NaN');
+    });
+  });
+
+  describe('solveLinearSystem', function () {
+    it('calculates correctly', function () {
+      const result = solveLinearSystem([
+        [2, 1, 3, 1],
+        [2, 6, 8, 3],
+        [6, 8, 18, 5],
+      ]);
+      expect(result[0]).to.roughlyEqual(0.3, 1e-9);
+      expect(result[1]).to.roughlyEqual(0.4, 1e-9);
+      expect(result[2]).to.roughlyEqual(0, 1e-9);
+    });
+
+    it('can handle singular matrix', function () {
+      const result = solveLinearSystem([
+        [2, 1, 3, 1],
+        [2, 6, 8, 3],
+        [2, 1, 3, 1],
+      ]);
+      expect(result).to.be(null);
+    });
+  });
+
+  describe('toDegrees', function () {
+    it('returns the correct value at -π', function () {
+      expect(toDegrees(-Math.PI)).to.be(-180);
+    });
+    it('returns the correct value at 0', function () {
+      expect(toDegrees(0)).to.be(0);
+    });
+    it('returns the correct value at π', function () {
+      expect(toDegrees(Math.PI)).to.be(180);
+    });
+  });
+
+  describe('toRadians', function () {
+    it('returns the correct value at -180', function () {
+      expect(toRadians(-180)).to.be(-Math.PI);
+    });
+    it('returns the correct value at 0', function () {
+      expect(toRadians(0)).to.be(0);
+    });
+    it('returns the correct value at 180', function () {
+      expect(toRadians(180)).to.be(Math.PI);
+    });
+  });
+
+  describe('modulo', function () {
+    it('256 / 8 returns 0', function () {
+      expect(modulo(256, 8)).to.be(0);
+    });
+    it('positive and positive returns a positive ', function () {
+      expect(modulo(7, 8)).to.be(7);
+    });
+    it('same Dividend and Divisor returns 0', function () {
+      expect(modulo(4, 4)).to.be(0);
+    });
+    it('negative and positive returns positive', function () {
+      expect(modulo(-3, 4)).to.be(1);
+    });
+    it('negative and negative returns negative', function () {
+      expect(modulo(-4, -5)).to.be(-4);
+      expect(modulo(-3, -4)).to.be(-3);
+    });
+    it('positive and negative returns negative', function () {
+      expect(modulo(3, -4)).to.be(-1);
+      expect(modulo(1, -5)).to.be(-4);
+      expect(modulo(6, -5)).to.be(-4);
+    });
+  });
+
+  describe('lerp', function () {
+    it('correctly interpolated numbers', function () {
+      expect(lerp(0, 0, 0)).to.be(0);
+      expect(lerp(0, 1, 0)).to.be(0);
+      expect(lerp(1, 11, 5)).to.be(51);
+    });
+    it('correctly interpolates floats', function () {
+      expect(lerp(0, 1, 0.5)).to.be(0.5);
+      expect(lerp(0.25, 0.75, 0.5)).to.be(0.5);
+    });
+  });
+});

test/node/ol/obj.test.js

@@ -0,0 +1,67 @@
+import expect from '../expect.js';
+import {assign, clear, getValues, isEmpty} from '../../../src/ol/obj.js';
+
+describe('ol/obj.js', () => {
+  describe('assign()', function () {
+    it('is an alias for Object.assign() where available', function () {
+      if (typeof Object.assign === 'function') {
+        expect(assign).to.be(Object.assign);
+      }
+    });
+
+    it('assigns properties from a source object to a target object', function () {
+      const source = {
+        sourceProp1: 'sourceValue1',
+        sourceProp2: 'sourceValue2',
+      };
+
+      const target = {
+        sourceProp1: 'overridden',
+        targetProp1: 'targetValue1',
+      };
+
+      const assigned = assign(target, source);
+      expect(assigned).to.be(target);
+      expect(assigned.sourceProp1).to.be('sourceValue1');
+      expect(assigned.sourceProp2).to.be('sourceValue2');
+      expect(assigned.targetProp1).to.be('targetValue1');
+    });
+
+    it('throws a TypeError with `undefined` as target', function () {
+      expect(() => assign()).to.throwException(
+        /Cannot convert undefined or null to object/
+      );
+    });
+
+    it('throws a TypeError with `null` as target', function () {
+      expect(() => assign(null)).to.throwException(
+        /Cannot convert undefined or null to object/
+      );
+    });
+  });
+
+  describe('clear()', function () {
+    it('removes all properties from an object', function () {
+      expect(isEmpty(clear({foo: 'bar'}))).to.be(true);
+      expect(isEmpty(clear({foo: 'bar', num: 42}))).to.be(true);
+      expect(isEmpty(clear({}))).to.be(true);
+      expect(isEmpty(clear(null))).to.be(true);
+    });
+  });
+
+  describe('getValues()', function () {
+    it('gets a list of property values from an object', function () {
+      expect(getValues({foo: 'bar', num: 42}).sort()).to.eql([42, 'bar']);
+      expect(getValues([])).to.eql([]);
+    });
+  });
+
+  describe('isEmpty()', function () {
+    it('checks if an object has any properties', function () {
+      expect(isEmpty({})).to.be(true);
+      expect(isEmpty(null)).to.be(true);
+      expect(isEmpty({foo: 'bar'})).to.be(false);
+      expect(isEmpty({foo: false})).to.be(false);
+    });
+  });
+});

test/node/ol/proj.test.js

@@ -1,6 +1,8 @@
-import Projection from '../../../../src/ol/proj/Projection.js';
+import Projection from '../../../src/ol/proj/Projection.js';
-import Units from '../../../../src/ol/proj/Units.js';
+import Units from '../../../src/ol/proj/Units.js';
-import {HALF_SIZE} from '../../../../src/ol/proj/epsg3857.js';
+import expect from '../expect.js';
+import proj4 from 'proj4';
+import {HALF_SIZE} from '../../../src/ol/proj/epsg3857.js';
 import {
   METERS_PER_UNIT,
   addCommon,
@@ -22,11 +24,11 @@ import {
   transform,
   transformExtent,
   useGeographic,
-} from '../../../../src/ol/proj.js';
+} from '../../../src/ol/proj.js';
-import {METERS_PER_UNIT as metersPerDegree} from '../../../../src/ol/proj/epsg4326.js';
+import {METERS_PER_UNIT as metersPerDegree} from '../../../src/ol/proj/epsg4326.js';
-import {register} from '../../../../src/ol/proj/proj4.js';
+import {register} from '../../../src/ol/proj/proj4.js';
 
-describe('ol.proj', function () {
+describe('ol/proj.js', function () {
   afterEach(function () {
     clearAllProjections();
     clearUserProjection();

test/node/ol/structs/linkedlist.test.js

@@ -1,6 +1,7 @@
-import LinkedList from '../../../../../src/ol/structs/LinkedList.js';
+import LinkedList from '../../../../src/ol/structs/LinkedList.js';
+import expect from '../../expect.js';
 
-describe('ol.structs.LinkedList', function () {
+describe('ol/structs/LinkedList.js', function () {
   let ll;
   const item = {};
   const item2 = {};

test/node/ol/structs/lrucache.test.js

@@ -1,6 +1,7 @@
-import LRUCache from '../../../../../src/ol/structs/LRUCache.js';
+import LRUCache from '../../../../src/ol/structs/LRUCache.js';
+import expect from '../../expect.js';
 
-describe('ol.structs.LRUCache', function () {
+describe('ol/structs/LRUCache.js', function () {
   let lruCache;
 
   function fillLRUCache(lruCache) {

test/node/ol/structs/priorityqueue.test.js

@@ -1,8 +1,7 @@
-import PriorityQueue, {
+import PriorityQueue, {DROP} from '../../../../src/ol/structs/PriorityQueue.js';
-  DROP,
+import expect from '../../expect.js';
-} from '../../../../../src/ol/structs/PriorityQueue.js';
 
-describe('ol.structs.PriorityQueue', function () {
+describe('ol/structs/PriorityQueue.js', function () {
   const identity = function (a) {
     return a;
   };

test/node/ol/structs/rbush.test.js

@@ -1,6 +1,7 @@
-import RBush from '../../../../../src/ol/structs/RBush.js';
+import RBush from '../../../../src/ol/structs/RBush.js';
+import expect from '../../expect.js';
 
-describe('ol.structs.RBush', function () {
+describe('ol/structs/RBush.js', function () {
   let rBush;
   beforeEach(function () {
     rBush = new RBush();

test/node/ol/tilegrid/TileGrid.test.js

@@ -1,24 +1,25 @@
-import Projection from '../../../../../src/ol/proj/Projection.js';
+import Projection from '../../../../src/ol/proj/Projection.js';
-import TileGrid from '../../../../../src/ol/tilegrid/TileGrid.js';
+import TileGrid from '../../../../src/ol/tilegrid/TileGrid.js';
-import TileRange from '../../../../../src/ol/TileRange.js';
+import TileRange from '../../../../src/ol/TileRange.js';
+import expect from '../../expect.js';
 import {
   DEFAULT_MAX_ZOOM,
   DEFAULT_TILE_SIZE,
-} from '../../../../../src/ol/tilegrid/common.js';
+} from '../../../../src/ol/tilegrid/common.js';
-import {HALF_SIZE} from '../../../../../src/ol/proj/epsg3857.js';
+import {HALF_SIZE} from '../../../../src/ol/proj/epsg3857.js';
 import {
   METERS_PER_UNIT,
   get as getProjection,
-} from '../../../../../src/ol/proj.js';
+} from '../../../../src/ol/proj.js';
 import {
   createForExtent,
   createForProjection,
   createXYZ,
   getForProjection as getTileGridForProjection,
-} from '../../../../../src/ol/tilegrid.js';
+} from '../../../../src/ol/tilegrid.js';
-import {createOrUpdate} from '../../../../../src/ol/extent.js';
+import {createOrUpdate} from '../../../../src/ol/extent.js';
 
-describe('ol.tilegrid.TileGrid', function () {
+describe('ol/tilegrid/TileGrid.js', function () {
   let resolutions;
   let origin;
   let tileSize;

test/node/ol/util.test.js

@@ -0,0 +1,25 @@
+import expect from '../expect.js';
+import {getUid} from '../../../src/ol/util.js';
+
+describe('ol/util.js', () => {
+  describe('getUid()', function () {
+    it('is constant once generated', function () {
+      const a = {};
+      expect(getUid(a)).to.be(getUid(a));
+    });
+
+    it('generates a strictly increasing sequence', function () {
+      const a = {};
+      const b = {};
+      const c = {};
+      getUid(a);
+      getUid(c);
+      getUid(b);
+
+      // uid order should be a < c < b
+      expect(getUid(a)).to.be.lessThan(getUid(c));
+      expect(getUid(c)).to.be.lessThan(getUid(b));
+      expect(getUid(a)).to.be.lessThan(getUid(b));
+    });
+  });
+});

test/node/ol/vec/mat4.test.js

@@ -1,13 +1,14 @@
-import {create, fromTransform} from '../../../../../src/ol/vec/mat4.js';
+import expect from '../../expect.js';
+import {create, fromTransform} from '../../../../src/ol/vec/mat4.js';
 
-describe('mat4', function () {
+describe('ol/vec/mat4.js', function () {
-  describe('mat4.create()', function () {
+  describe('create()', function () {
     it('returns the expected matrix', function () {
       expect(create()).to.eql([1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]);
     });
   });
 
-  describe('mat4.fromTransform()', function () {
+  describe('fromTransform()', function () {
     it('sets the expected transform on the matrix', function () {
       const transform = [1, 2, 3, 4, 5, 6];
       const result = create();

test/node/readme.md

@@ -0,0 +1,11 @@
+# Node.js Based Tests
+
+The tests in this directory are run in Node.js.  To run the tests:
+
+    npm run test-node
+
+To attach a debugger to the tests, add a `debugger` statement in the module that you want to debug and run the tests with the `--inspect-brk` flag:
+
+    npm run test-node -- --inspect-brk
+
+Then open chrome://inspect/ and attach to the remote target (or see https://nodejs.org/en/docs/guides/debugging-getting-started/ for other options).