Add test for cmEditor directive

services/web/test/unit_frontend/coffee/ide/editor/directives/cmEditorTests.coffee

@@ -0,0 +1,53 @@
+define ['ide/editor/directives/cmEditor'], () ->
+  describe 'cmEditor', () ->
+    beforeEach(module('SharelatexApp'))
+
+    beforeEach () ->
+      @richTextInit = sinon.stub()
+      window.Frontend = {
+        richText: {
+          init: @richTextInit
+        }
+      }
+
+    it 'inits Rich Text', () ->
+      inject ($compile, $rootScope) ->
+        $compile('<div cm-editor></div>')($rootScope)
+        expect(@richTextInit).to.have.been.called
+
+    it 'attaches to CM', () ->
+      inject ($compile, $rootScope) ->
+        setValue = sinon.stub()
+        @richTextInit.returns({ setValue: setValue })
+        getSnapshot = sinon.stub()
+        detachFromCM = sinon.stub()
+        attachToCM = sinon.stub()
+        $rootScope.sharejsDoc = {
+          getSnapshot: getSnapshot
+          detachFromCM: detachFromCM
+          attachToCM: attachToCM
+        }
+
+        $compile('<div cm-editor sharejs-doc="sharejsDoc"></div>')($rootScope)
+        $rootScope.$digest()
+
+        expect(getSnapshot).to.have.been.called
+        expect(setValue).to.have.been.called
+        expect(detachFromCM).to.have.been.called
+        expect(attachToCM).to.have.been.called
+
+    it 'detaches from CM when destroyed', () ->
+      inject ($compile, $rootScope) ->
+        @richTextInit.returns({ setValue: sinon.stub() })
+        detachFromCM = sinon.stub()
+        $rootScope.sharejsDoc = {
+          getSnapshot: sinon.stub()
+          detachFromCM: detachFromCM
+          attachToCM: sinon.stub()
+        }
+
+        $compile('<div cm-editor sharejs-doc="sharejsDoc"></div>')($rootScope)
+        $rootScope.$digest()
+        $rootScope.$broadcast('destroy')
+
+        expect(detachFromCM).to.have.been.called