fix(ngMock): Change ErrorAddingDeclarationLocationStack prototype

src/ngMock/angular-mocks.js

@@ -2774,7 +2774,7 @@ if (window.jasmine || window.mocha) {
       this.stack = e.stack + '\n' + errorForStack.stack;
     if (e.stackArray) this.stackArray = e.stackArray;
   };
-  ErrorAddingDeclarationLocationStack.prototype.toString = Error.prototype.toString;
+  ErrorAddingDeclarationLocationStack.prototype = Error.prototype;
 
   window.inject = angular.mock.inject = function() {
     var blockFns = Array.prototype.slice.call(arguments, 0);

test/ngMock/angular-mocksSpec.js

@@ -2505,6 +2505,44 @@ describe('`afterEach` clean-up', function() {
     });
   });
 
+  describe('ErrorAddingDeclarationLocationStack', function() {
+    it('should be caught by jasmine\'s toThrowError', function() {
+      //create function that causes an error
+      function causeNgMocksError() {
+        module(function($provide) {
+          //cause $provide.factory to include an error
+          $provide.factory('causeError', function() {
+            //Say for example, some mock module caused an error when instantiated
+            throw new Error("Error!");
+          });
+        });
+
+        //call the injector on 'causeError' to make sure the provider is called
+        var causeError;
+        inject(function(_causeError_) {
+          causeError = _causeError_;
+        });
+      }
+
+      //The following is a simplified implementation of future Jasmine's .toThrowError()
+      //  which is at the root of this problem
+      var error;
+      try {
+        causeNgMocksError();
+      } catch (e) {
+        error = e;
+      }
+
+      //Apologies for inelegant pass/fail conditions
+      if (error instanceof Error) {
+        //pass test
+        expect(true).toBe(true);
+      } else {
+        //fail test
+        throw new Error("Expected Error but got " + error);
+      }
+    });
+  });
 
   describe('uninstantiated or falsy `$rootElement`', function() {
     it('should not break if `$rootElement` was never instantiated', function() {