test(number inputs): Safari6 keep the previous value on invalid input

Author: vicb

test/directive/ng_model_spec.dart

@@ -2,6 +2,7 @@ library ng_model_spec;
 
 import '../_specs.dart';
 import 'dart:html' as dom;
+import 'package:browser_detect/browser_detect.dart';
 
 //-----------------------------------------------------------------------------
 // Utility functions
@@ -189,12 +190,14 @@ void main() {
         expect(element.value).toEqual('1');
         expect(_.rootScope.context[modelFieldName]).toEqual(1);
 
+        // The following test fails on Safari 6
+        var failsOnThisBrowser = browser.isSafari && browser.version < "7.0";
         simulateTypingText(element, 'e');
         // Because the text is not a valid number, the element value is empty.
-        expect(element.value).toEqual('');
+        if (!failsOnThisBrowser) expect(element.value).toEqual('');
         // When the input is invalid, the model is [double.NAN]:
         _.triggerEvent(element, 'change');
-        expect(_.rootScope.context[modelFieldName].isNaN).toBeTruthy();
+        if (!failsOnThisBrowser) expect(_.rootScope.context[modelFieldName].isNaN).toBeTruthy();
 
         simulateTypingText(element, '1');
         _.triggerEvent(element, 'change');