diff --git a/test/spec/ol/assertionerror.test.js b/test/spec/ol/assertionerror.test.js
index dcf0bd4566..8b37f3a6a1 100644
--- a/test/spec/ol/assertionerror.test.js
+++ b/test/spec/ol/assertionerror.test.js
@@ -4,9 +4,9 @@ goog.require('ol');
 goog.require('ol.AssertionError');
 
 describe('ol.AssertionError', function() {
-  it('generates a message', function() {
+  it('generates an error', function() {
     var error = new ol.AssertionError(42);
-    expect(error.message).to.be('Assertion failed. See https://openlayers.org/en/latest/doc/errors/#42 for details.');
+    expect(error).to.be.an(Error);
   });
 
   it('generates a message with a versioned url', function() {
diff --git a/test/spec/ol/style/iconimagecache.test.js b/test/spec/ol/style/iconimagecache.test.js
index a883f772ca..ef47345275 100644
--- a/test/spec/ol/style/iconimagecache.test.js
+++ b/test/spec/ol/style/iconimagecache.test.js
@@ -39,7 +39,7 @@ describe('ol.style.IconImageCache', function() {
       expect(cache.cacheSize_).to.eql(4);
 
       src = '4';
-      iconImage = new ol.style.IconImage(src, null);
+      iconImage = new ol.style.IconImage(null, src);
       cache.set(src, null, null, iconImage);
       expect(cache.cacheSize_).to.eql(5);
 
@@ -47,14 +47,14 @@ describe('ol.style.IconImageCache', function() {
       expect(cache.cacheSize_).to.eql(3);
 
       src = '0';
-      iconImage = new ol.style.IconImage(src, null);
+      iconImage = new ol.style.IconImage(null, src);
       ol.events.listen(iconImage, 'change',
           ol.nullFunction, false);
       cache.set(src, null, null, iconImage);
       expect(cache.cacheSize_).to.eql(4);
 
       src = '4';
-      iconImage = new ol.style.IconImage(src, null);
+      iconImage = new ol.style.IconImage(null, src);
       ol.events.listen(iconImage, 'change',
           ol.nullFunction, false);
       cache.set(src, null, null, iconImage);
diff --git a/test/spec/ol/tilequeue.test.js b/test/spec/ol/tilequeue.test.js
index 2e1ec1c1cb..5c01615663 100644
--- a/test/spec/ol/tilequeue.test.js
+++ b/test/spec/ol/tilequeue.test.js
@@ -26,8 +26,12 @@ describe('ol.TileQueue', function() {
     ++tileId;
     var tileCoord = [tileId, tileId, tileId];
     var state = 0; // IDLE
-    var src = 'data:image/gif;base64,R0lGODlhAQABAPAAAP8AAP///' +
-        'yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==#' + tileId;
+    // The tile queue requires a unique URI for each item added.
+    // Browsers still load the resource even if they don't understand
+    // the charset.  So we create a unique URI by abusing the charset.
+    var src = 'data:image/gif;charset=junk-' + tileId +
+        ';base64,R0lGODlhAQABAPAAAP8AAP///' +
+        'yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==';
 
     var tileLoadFunction = opt_tileLoadFunction ?
       opt_tileLoadFunction : ol.source.Image.defaultImageLoadFunction;