Organize tests

test/browser/spec/ol/renderer/canvas/vectorimage.test.js

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+import CanvasVectorImageLayerRenderer from '../../../../../../src/ol/renderer/canvas/VectorImageLayer.js';
+import VectorImageLayer from '../../../../../../src/ol/layer/VectorImage.js';
+import VectorSource from '../../../../../../src/ol/source/Vector.js';
+import {create} from '../../../../../../src/ol/transform.js';
+import {get as getProjection} from '../../../../../../src/ol/proj.js';
+import {scaleFromCenter} from '../../../../../../src/ol/extent.js';
+
+describe('ol/renderer/canvas/VectorImageLayer', function () {
+  describe('#dispose()', function () {
+    it('cleans up CanvasVectorRenderer', function () {
+      const layer = new VectorImageLayer({
+        source: new VectorSource(),
+      });
+      const renderer = new CanvasVectorImageLayerRenderer(layer);
+      const spy = sinon.spy(renderer.vectorRenderer_, 'dispose');
+      renderer.dispose();
+      expect(spy.called).to.be(true);
+    });
+  });
+
+  describe('#prepareFrame', function () {
+    it('sets correct extent with imageRatio = 2', function () {
+      const layer = new VectorImageLayer({
+        imageRatio: 2,
+        source: new VectorSource(),
+      });
+      const renderer = new CanvasVectorImageLayerRenderer(layer);
+      const projection = getProjection('EPSG:3857');
+      const projExtent = projection.getExtent();
+      const extent = [
+        projExtent[0] - 10000,
+        -10000,
+        projExtent[0] + 10000,
+        10000,
+      ];
+      const frameState = {
+        layerStatesArray: [layer.getLayerState()],
+        layerIndex: 0,
+        extent: extent,
+        viewHints: [],
+        pixelToCoordinateTransform: create(),
+        viewState: {
+          center: [0, 0],
+          projection: projection,
+          resolution: 1,
+          rotation: 0,
+        },
+      };
+      renderer.prepareFrame(frameState);
+      const expected = renderer.image_.getExtent();
+
+      scaleFromCenter(extent, 2);
+
+      expect(expected).to.eql(extent);
+    });
+  });
+});