test(booleanAttrsSpec): add unit test for IE11 URL parsing failure

IE11/10/Edge fail when setting a href to a URL containing a % that isn't a valid escape sequence

See angular#13388
Closes angular#13458

Author: Andy Patterson

test/ng/directive/booleanAttrsSpec.js

@@ -283,6 +283,18 @@ describe('ngHref', function() {
     expect(element.attr('href')).toEqual(undefined);
   }));
 
+  if (msie) {
+    // IE11/10/Edge fail when setting a href to a URL containing a % that isn't a valid escape sequence
+    // See https://github.com/angular/angular.js/issues/13388
+    it('should throw error if ng-href contains a non-escaped percent symbol', inject(function($rootScope, $compile) {
+      element = $compile('<a ng-href="http://www.google.com/{{\'a%link\'}}">')($rootScope);
+
+      expect(function() {
+        $rootScope.$digest();
+      }).toThrow();
+    }));
+  }
+
   if (isDefined(window.SVGElement)) {
     describe('SVGAElement', function() {
       it('should interpolate the expression and bind to xlink:href', inject(function($compile, $rootScope) {