diff --git a/lib/ace/editor_navigation_test.js b/lib/ace/editor_navigation_test.js
index 93eaa2c2..9a715445 100644
--- a/lib/ace/editor_navigation_test.js
+++ b/lib/ace/editor_navigation_test.js
@@ -82,7 +82,7 @@ module.exports = {
         editor.navigateTo(0, 0);
         editor.gotoLine(101);
         assert.position(editor.getCursorPosition(), 100, 0);
-        assert.equal(editor.getFirstVisibleRow(), 90);
+        assert.equal(editor.getFirstVisibleRow(), 89);
 
         editor.navigateTo(100, 0);
         editor.gotoLine(11);
@@ -102,7 +102,7 @@ module.exports = {
         editor.navigateTo(0, 0);
         editor.gotoLine(191);
         assert.position(editor.getCursorPosition(), 190, 0);
-        assert.equal(editor.getFirstVisibleRow(), 180);
+        assert.equal(editor.getFirstVisibleRow(), 179);
 
         editor.navigateTo(0, 0);
         editor.gotoLine(196);
diff --git a/lib/ace/test/mockrenderer.js b/lib/ace/test/mockrenderer.js
index 8305705a..03dd9693 100644
--- a/lib/ace/test/mockrenderer.js
+++ b/lib/ace/test/mockrenderer.js
@@ -107,6 +107,10 @@ MockRenderer.prototype.on = function() {
 MockRenderer.prototype.updateCursor = function() {
 };
 
+MockRenderer.prototype.animateScrolling = function(scrollFunc, self) {
+    scrollFunc.call(self);
+};
+
 MockRenderer.prototype.scrollToX = function(scrollTop) {};
 MockRenderer.prototype.scrollToY = function(scrollLeft) {};