docs/content/error/ng/test.ngdoc

@@ -0,0 +1,9 @@
+@ngdoc error
+@name ng:test
+@fullName Testability Not Found
+@description
+
+Angular's testability helper, getTestability, requires a root element to be
+passed in. This helps differentiate between different Angular apps on the same
+page. This error is thrown when no injector is found for root element. It is
+often because the root element is outside of the ng-app.

src/Angular.js

@@ -1428,7 +1428,12 @@ function reloadWithDebugInfo() {
  * @param {DOMElement} element DOM element which is the root of angular application.
  */
 function getTestability(rootElement) {
-  return angular.element(rootElement).injector().get('$$testability');
+  var injector = angular.element(rootElement).injector();
+  if (!injector) {
+    throw ngMinErr('test',
+      'no injector found for element argument to getTestability');
+  }
+  return injector.get('$$testability');
 }
 
 var SNAKE_CASE_REGEXP = /[A-Z]/g;