pattern(directive): add require ngModel pattern

Author: daniellmb

example/coffeescript/app.coffee

@@ -76,6 +76,7 @@ angular.module('myApp')
 .directive 'myDir', [ ->
   template: '<div></div>'
   restrict: 'EAC'
+  require: 'ngModel'
   link: (scope, element, attrs) ->
     element.text 'this is my directive'
 ]

example/javascript/app.js

@@ -81,6 +81,7 @@ angular.module('myApp')
     return {
       template: '<div></div>',
       restrict: 'EAC',
+      require: 'ngModel',
       link: function (scope, element, attrs) {
         return element.text('this is my directive');
       }

patterns/directive.md

@@ -4,6 +4,7 @@
 
 * [Suggested Setup](#suggested-directive-unit-test-setup-)
 * When created
+  * [should throw error when ngModel attribute not defined](#throw-error-when-ngmodel-attribute-not-defined-)
   * [should render the expected output](#render-the-expected-output-)
 * When the model changes
   * *[pull request welcome!](../#contributing-test-patterns)*
@@ -120,6 +121,25 @@ describe('Directive: myDir', function () {
 
 #### My directive should:
 
+#####throw error when ngModel attribute not defined [↑](#testing-patterns)
+```CoffeeScript
+# CoffeeScript
+it 'should throw error when ngModel attribute not defined', ->
+  invalidTemplate = ->
+    createDirective null, '<my-dir></my-dir>'
+  expect(invalidTemplate).toThrow new Error('No controller: ngModel')
+```
+
+```JavaScript
+// JavaScript
+it('should throw error when ngModel attribute not defined', function () {
+  function invalidTemplate() {
+    createDirective(null, '<my-dir></my-dir>');
+  }
+  expect(invalidTemplate).toThrow(new Error('No controller: ngModel'));
+});
+```
+
 #####render the expected output [&#8593;](#testing-patterns)
 ```CoffeeScript
 # CoffeeScript