Organize tests

test/browser/spec/ol/featureloader.test.js

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+import GeoJSON from '../../../../src/ol/format/GeoJSON.js';
+import VectorSource from '../../../../src/ol/source/Vector.js';
+import {xhr} from '../../../../src/ol/featureloader.js';
+
+describe('ol.featureloader', function () {
+  describe('ol.featureloader.xhr', function () {
+    let loader;
+    let source;
+    let url;
+    let format;
+
+    beforeEach(function () {
+      url = 'spec/ol/data/point.json';
+      format = new GeoJSON();
+
+      source = new VectorSource();
+    });
+
+    it('adds features to the source', function (done) {
+      loader = xhr(url, format);
+      source.on('addfeature', function (e) {
+        setTimeout(function () {
+          expect(source.getFeatures().length).to.be.greaterThan(0);
+          done();
+        }, 0);
+      });
+      loader.call(source, [], 1, 'EPSG:3857');
+    });
+
+    describe('when called with urlFunction', function () {
+      it('adds features to the source', function (done) {
+        url = function (extent, resolution, projection) {
+          return 'spec/ol/data/point.json';
+        };
+        loader = xhr(url, format);
+
+        source.on('addfeature', function (e) {
+          setTimeout(function () {
+            expect(source.getFeatures().length).to.be.greaterThan(0);
+            done();
+          }, 0);
+        });
+        loader.call(source, [], 1, 'EPSG:3857');
+      });
+
+      it('sends the correct arguments to the urlFunction', function (done) {
+        const extent = [];
+        const resolution = 1;
+        const projection = 'EPSG:3857';
+        url = function (extent_, resolution_, projection_) {
+          expect(extent_).to.eql(extent);
+          expect(resolution_).to.eql(resolution);
+          expect(projection_).to.eql(projection);
+          done();
+          return 'spec/ol/data/point.json';
+        };
+        loader = xhr(url, format);
+        loader.call(source, [], 1, 'EPSG:3857');
+      });
+    });
+
+    it('it calls the success callback', function (done) {
+      const errorSpy = sinon.spy();
+      loader = xhr(url, format);
+      loader.call(
+        source,
+        [],
+        1,
+        'EPSG:3857',
+        function () {
+          setTimeout(function () {
+            expect(errorSpy.callCount).to.be(0);
+            done();
+          }, 0);
+        },
+        errorSpy
+      );
+    });
+  });
+});