Organize tests

test/browser/spec/ol/image.test.js

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+import {listenImage} from '../../../../src/ol/Image.js';
+
+describe('HTML Image loading', function () {
+  let handleLoad, handleError, img;
+
+  beforeEach(function () {
+    handleLoad = sinon.spy();
+    handleError = sinon.spy();
+    img = new Image();
+  });
+
+  it('handles load event', function (done) {
+    img.src = 'spec/ol/data/dot.png';
+    listenImage(img, handleLoad, handleError);
+
+    setTimeout(function () {
+      expect(handleLoad.called).to.be(true);
+      expect(handleError.called).to.be(false);
+      done();
+    }, 200);
+  });
+
+  it('handles load event when src is set later', function (done) {
+    listenImage(img, handleLoad, handleError);
+    img.src = 'spec/ol/data/dot.png';
+
+    setTimeout(function () {
+      expect(handleLoad.called).to.be(true);
+      expect(handleError.called).to.be(false);
+      done();
+    }, 200);
+  });
+
+  it('handles error event', function (done) {
+    img.src = 'invalid.jpeg';
+    listenImage(img, handleLoad, handleError);
+
+    setTimeout(function () {
+      expect(handleLoad.called).to.be(false);
+      expect(handleError.called).to.be(true);
+      done();
+    }, 500);
+  });
+
+  it('handles cancelation', function (done) {
+    img.src = 'spec/ol/data/dot.png';
+    listenImage(img, handleLoad, handleError)();
+
+    setTimeout(function () {
+      expect(handleLoad.called).to.be(false);
+      expect(handleError.called).to.be(false);
+      done();
+    }, 200);
+  });
+});