Added todo controller tests for merge requests

spec/controllers/projects/todo_controller_spec.rb

@@ -4,7 +4,9 @@ describe Projects::TodosController do
   let(:user)          { create(:user) }
   let(:project)       { create(:project) }
   let(:issue)         { create(:issue, project: project) }
+  let(:merge_request) { create(:merge_request, source_project: project) }
 
+  context 'Issues' do
     describe 'POST #create' do
       before do
         sign_in(user)
@@ -52,4 +54,55 @@ describe Projects::TodosController do
         expect(response.status).to eq(302)
       end
     end
+  end
+
+  context 'Merge Requests' do
+    describe 'POST #create' do
+      before do
+        sign_in(user)
+        project.team << [user, :developer]
+      end
+
+      it 'should create todo for issue' do
+        expect do
+          post(:create, namespace_id: project.namespace.path,
+                        project_id: project.path,
+                        issuable_id: merge_request.id,
+                        issuable_type: "merge_request")
+        end.to change { user.todos.count }.by(1)
+
+        expect(response.status).to eq(200)
+      end
+    end
+
+    describe 'POST #create when not authorized' do
+      before do
+        sign_in(user)
+      end
+
+      it 'should create todo for issue' do
+        expect do
+          post(:create, namespace_id: project.namespace.path,
+                        project_id: project.path,
+                        issuable_id: merge_request.id,
+                        issuable_type: "merge_request")
+        end.to change { user.todos.count }.by(0)
+
+        expect(response.status).to eq(404)
+      end
+    end
+
+    describe 'POST #create when not logged in' do
+      it 'should create todo for issue' do
+        expect do
+          post(:create, namespace_id: project.namespace.path,
+                        project_id: project.path,
+                        issuable_id: merge_request.id,
+                        issuable_type: "merge_request")
+        end.to change { user.todos.count }.by(0)
+
+        expect(response.status).to eq(302)
+      end
+    end
+  end
 end