diff --git a/test/spec/ol/source/tilewmssource.test.js b/test/spec/ol/source/tilewmssource.test.js
index c7b192b641..c64247d3fb 100644
--- a/test/spec/ol/source/tilewmssource.test.js
+++ b/test/spec/ol/source/tilewmssource.test.js
@@ -104,6 +104,46 @@ describe('ol.source.TileWMS', function() {
 
   });
 
+  describe('#tileUrlFunction', function() {
+
+    it('returns a tile if it is contained within layers extent', function() {
+      options.extent = [-80, -40, -50, -10];
+      var source = new ol.source.TileWMS(options);
+      var tileCoord = new ol.TileCoord(3, 2, 1);
+      var url = source.tileUrlFunction(tileCoord, 1, ol.proj.get('EPSG:4326'));
+      var uri = new goog.Uri(url);
+      var queryData = uri.getQueryData();
+      expect(queryData.get('BBOX')).to.be('-45,-90,0,-45');
+    });
+
+    it('returns a tile if it intersects layers extent', function() {
+      options.extent = [-80, -40, -40, -10];
+      var source = new ol.source.TileWMS(options);
+      var tileCoord = new ol.TileCoord(3, 3, 1);
+      var url = source.tileUrlFunction(tileCoord, 1, ol.proj.get('EPSG:4326'));
+      var uri = new goog.Uri(url);
+      var queryData = uri.getQueryData();
+      expect(queryData.get('BBOX')).to.be('-45,-45,0,0');
+    });
+
+    it('does not return a tile if it touches layers extent', function() {
+      options.extent = [-80, -40, -45, -10];
+      var source = new ol.source.TileWMS(options);
+      var tileCoord = new ol.TileCoord(3, 3, 1);
+      var url = source.tileUrlFunction(tileCoord, 1, ol.proj.get('EPSG:4326'));
+      expect(url).to.be(undefined);
+    });
+
+    it('does not return a tile outside of layers extent', function() {
+      options.extent = [-80, -40, -45, -10];
+      var source = new ol.source.TileWMS(options);
+      var tileCoord = new ol.TileCoord(3, 4, 2);
+      var url = source.tileUrlFunction(tileCoord, 1, ol.proj.get('EPSG:4326'));
+      expect(url).to.be(undefined);
+    });
+
+  });
+
   describe('#getGetFeatureInfo', function() {
 
     it('returns the expected GetFeatureInfo URL', function() {
@@ -177,4 +217,5 @@ describe('ol.source.TileWMS', function() {
 goog.require('goog.Uri');
 goog.require('ol.ImageTile');
 goog.require('ol.source.TileWMS');
+goog.require('ol.TileCoord');
 goog.require('ol.proj');