Add basic test for ol.layer.Heatmap

test/spec/ol/layer/heatmaplayer.test.js

@@ -0,0 +1,16 @@
+goog.provide('ol.test.layer.Heatmap');
+
+describe('ol.layer.Heatmap', function() {
+
+  describe('constructor', function() {
+
+    it('can be constructed without arguments', function() {
+      var instance = new ol.layer.Heatmap();
+      expect(instance).to.be.an(ol.layer.Heatmap);
+    });
+
+  });
+
+});
+
+goog.require('ol.layer.Heatmap');