Assert that ol.layer.Tile#getPreload is always set

test/spec/ol/layer/tilelayer.test.js

@@ -0,0 +1,33 @@
+goog.provide('ol.test.layer.Tile');
+
+describe('ol.layer.Tile', function() {
+
+  describe('constructor (defaults)', function() {
+
+    var layer;
+
+    beforeEach(function() {
+      layer = new ol.layer.Tile({
+        source: new ol.source.OSM()
+      });
+    });
+
+    afterEach(function() {
+      goog.dispose(layer);
+    });
+
+    it('creates an instance', function() {
+      expect(layer).to.be.a(ol.layer.Tile);
+    });
+
+    it('provides default preload', function() {
+      expect(layer.getPreload()).to.be(0);
+    });
+
+  });
+
+});
+
+goog.require('goog.dispose');
+goog.require('ol.layer.Tile');
+goog.require('ol.source.OSM');