Add tests

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

@@ -2,6 +2,8 @@ import Map from '../../../../../src/ol/Map.js';
 import View from '../../../../../src/ol/View.js';
 import TileLayer from '../../../../../src/ol/layer/Tile.js';
 import TileWMS from '../../../../../src/ol/source/TileWMS.js';
+import XYZ from '../../../../../src/ol/source/XYZ.js';
+import {fromLonLat} from '../../../../../src/ol/proj.js';
 
 
 describe('ol.renderer.canvas.TileLayer', function() {
@@ -49,4 +51,36 @@ describe('ol.renderer.canvas.TileLayer', function() {
     });
   });
 
+  describe('#renderFrame', function() {
+    let map, layer;
+    beforeEach(function() {
+      layer = new TileLayer({
+        source: new XYZ({
+          cacheSize: 1,
+          url: 'rendering/ol/data/tiles/osm/{z}/{x}/{y}.png'
+        })
+      });
+      map = new Map({
+        target: createMapDiv(100, 100),
+        layers: [layer],
+        view: new View({
+          center: fromLonLat([-122.416667, 37.783333]),
+          zoom: 5
+        })
+      });
+    });
+    afterEach(function() {
+      disposeMap(map);
+    });
+
+    it('increases the cache size if necessary', function(done) {
+      const tileCache = layer.getSource().tileCache;
+      expect(tileCache.highWaterMark).to.be(1);
+      map.once('rendercomplete', function() {
+        expect(tileCache.highWaterMark).to.be(2);
+        done();
+      });
+    });
+  });
+
 });