Organize tests

test/browser/spec/ol/tilerange.test.js

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+import TileRange from '../../../../src/ol/TileRange.js';
+
+describe('ol.TileRange', function () {
+  describe('constructor', function () {
+    it('creates a range', function () {
+      const range = new TileRange(1, 3, 2, 4);
+      expect(range).to.be.a(TileRange);
+    });
+
+    it('can represent a range of one tile', function () {
+      const range = new TileRange(2, 2, 3, 3);
+      expect(range).to.be.a(TileRange);
+      expect(range.getHeight()).to.be(1);
+      expect(range.getWidth()).to.be(1);
+    });
+  });
+
+  describe('contains', function () {
+    it('returns the expected value', function () {
+      const tileRange = new TileRange(1, 3, 1, 3);
+      expect(tileRange.contains([0, 0, 0])).to.not.be();
+      expect(tileRange.contains([0, 0, 1])).to.not.be();
+      expect(tileRange.contains([0, 0, 2])).to.not.be();
+      expect(tileRange.contains([0, 0, 3])).to.not.be();
+      expect(tileRange.contains([0, 0, 4])).to.not.be();
+      expect(tileRange.contains([0, 1, 0])).to.not.be();
+      expect(tileRange.contains([0, 1, 1])).to.be.ok();
+      expect(tileRange.contains([0, 1, 2])).to.be.ok();
+      expect(tileRange.contains([0, 1, 3])).to.be.ok();
+      expect(tileRange.contains([0, 1, 4])).to.not.be();
+      expect(tileRange.contains([0, 2, 0])).to.not.be();
+      expect(tileRange.contains([0, 2, 1])).to.be.ok();
+      expect(tileRange.contains([0, 2, 2])).to.be.ok();
+      expect(tileRange.contains([0, 2, 3])).to.be.ok();
+      expect(tileRange.contains([0, 2, 4])).to.not.be();
+      expect(tileRange.contains([0, 3, 0])).to.not.be();
+      expect(tileRange.contains([0, 3, 1])).to.be.ok();
+      expect(tileRange.contains([0, 3, 2])).to.be.ok();
+      expect(tileRange.contains([0, 3, 3])).to.be.ok();
+      expect(tileRange.contains([0, 3, 4])).to.not.be();
+      expect(tileRange.contains([0, 4, 0])).to.not.be();
+      expect(tileRange.contains([0, 4, 1])).to.not.be();
+      expect(tileRange.contains([0, 4, 2])).to.not.be();
+      expect(tileRange.contains([0, 4, 3])).to.not.be();
+      expect(tileRange.contains([0, 4, 4])).to.not.be();
+    });
+  });
+
+  describe('equals', function () {
+    it('determines equivalence of two ranges', function () {
+      const one = new TileRange(0, 2, 1, 4);
+      const same = new TileRange(0, 2, 1, 4);
+      const diff1 = new TileRange(0, 2, 1, 5);
+      const diff2 = new TileRange(0, 3, 1, 4);
+      const diff3 = new TileRange(0, 2, 2, 4);
+      const diff4 = new TileRange(1, 2, 1, 4);
+      expect(one.equals(same)).to.be(true);
+      expect(one.equals(diff1)).to.be(false);
+      expect(one.equals(diff2)).to.be(false);
+      expect(one.equals(diff3)).to.be(false);
+      expect(one.equals(diff4)).to.be(false);
+    });
+  });
+
+  describe('extent', function () {
+    it('modifies range so it includes another', function () {
+      const one = new TileRange(0, 2, 1, 4);
+      const other = new TileRange(-1, -3, 10, 12);
+      one.extend(other);
+
+      expect(one.minX).to.be(-1);
+      expect(one.maxX).to.be(2);
+      expect(one.minY).to.be(1);
+      expect(one.maxY).to.be(12);
+    });
+  });
+
+  describe('getSize', function () {
+    it('returns the expected size', function () {
+      const tileRange = new TileRange(0, 2, 1, 4);
+      const size = tileRange.getSize();
+      expect(size).to.eql([3, 4]);
+    });
+  });
+
+  describe('intersects', function () {
+    it('determines if two ranges overlap', function () {
+      const one = new TileRange(0, 2, 1, 4);
+      const overlapsRight = new TileRange(2, 4, 1, 4);
+      const overlapsLeft = new TileRange(-3, 0, 1, 4);
+      const overlapsTop = new TileRange(0, 2, 4, 5);
+      const overlapsBottom = new TileRange(0, 2, -3, 1);
+      expect(one.intersects(overlapsLeft)).to.be(true);
+      expect(one.intersects(overlapsRight)).to.be(true);
+      expect(one.intersects(overlapsTop)).to.be(true);
+      expect(one.intersects(overlapsBottom)).to.be(true);
+
+      const right = new TileRange(3, 5, 1, 4);
+      const left = new TileRange(-3, -1, 1, 4);
+      const above = new TileRange(0, 2, 5, 6);
+      const below = new TileRange(0, 2, -3, 0);
+      expect(one.intersects(right)).to.be(false);
+      expect(one.intersects(left)).to.be(false);
+      expect(one.intersects(above)).to.be(false);
+      expect(one.intersects(below)).to.be(false);
+    });
+  });
+});