Remove memory leak caused by label cache listeners

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

@@ -49,7 +49,7 @@ describe('ol.renderer.canvas.TileLayer', function() {
       });
       source.updateParams({TIME: '1'});
       map.renderSync();
-      const tiles = map.getRenderer().getLayerRenderer(layer).renderedTiles;
+      const tiles = layer.getRenderer().renderedTiles;
       expect(tiles.length).to.be(1);
       expect(tiles[0]).to.equal(tile);
       expect(tile.inTransition()).to.be(true);

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

@@ -75,7 +75,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
         style: layerStyle
       });
       map.addLayer(layer);
-      const spy = sinon.spy(map.getRenderer().getLayerRenderer(layer),
+      const spy = sinon.spy(layer.getRenderer(),
         'renderFeature');
       map.renderSync();
       expect(spy.getCall(0).args[3]).to.be(layerStyle);

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

@@ -140,7 +140,7 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
     });
 
     it('gives precedence to feature styles over layer styles', function() {
-      const spy = sinon.spy(map.getRenderer().getLayerRenderer(layer),
+      const spy = sinon.spy(layer.getRenderer(),
         'renderFeature');
       map.renderSync();
       expect(spy.getCall(0).args[2]).to.be(layer.getStyle());