Add an image vector layer for rendering vectors to an image

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

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+import VectorImageLayer from '../../../../../src/ol/layer/VectorImage.js';
+import VectorSource from '../../../../../src/ol/source/Vector.js';
+import CanvasVectorImageLayerRenderer from '../../../../../src/ol/renderer/canvas/VectorImageLayer.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);
+    });
+
+  });
+
+});