Fix error on changes tab when merge request cannot be createdissue_41460

1 files changed, 25 insertions, 17 deletions

diff --git a/spec/controllers/projects/merge_requests/creations_controller_spec.rb b/spec/controllers/projects/merge_requests/creations_controller_spec.rb
index 7e2366847f4..92db7284e0e 100644
--- a/spec/controllers/projects/merge_requests/creations_controller_spec.rb
+++ b/spec/controllers/projects/merge_requests/creations_controller_spec.rb
@@ -4,6 +4,16 @@ describe Projects::MergeRequests::CreationsController do
   let(:project) { create(:project, :repository) }
   let(:user)    { project.owner }
   let(:fork_project) { create(:forked_project_with_submodules) }
+  let(:get_diff_params) do
+    {
+      namespace_id: fork_project.namespace.to_param,
+      project_id: fork_project,
+      merge_request: {
+        source_branch: 'remove-submodule',
+        target_branch: 'master'
+      }
+    }
+  end
 
   before do
     fork_project.add_master(user)
@@ -13,18 +23,23 @@ describe Projects::MergeRequests::CreationsController do
 
   describe 'GET new' do
     context 'merge request that removes a submodule' do
-      render_views
-
       it 'renders new merge request widget template' do
-        get :new,
-            namespace_id: fork_project.namespace.to_param,
-            project_id: fork_project,
-            merge_request: {
-              source_branch: 'remove-submodule',
-              target_branch: 'master'
-            }
+        get :new, get_diff_params
+
+        expect(response).to be_success
+      end
+    end
+  end
+
+  describe 'GET diffs' do
+    context 'when merge request cannot be created' do
+      it 'does not assign diffs var' do
+        allow_any_instance_of(MergeRequest).to receive(:can_be_created).and_return(false)
+
+        get :diffs, get_diff_params.merge(format: 'json')
 
         expect(response).to be_success
+        expect(assigns[:diffs]).to be_nil
       end
     end
   end
@@ -37,14 +52,7 @@ describe Projects::MergeRequests::CreationsController do
     end
 
     it 'renders JSON including serialized pipelines' do
-      get :pipelines,
-          namespace_id: fork_project.namespace.to_param,
-          project_id: fork_project,
-          merge_request: {
-            source_branch: 'remove-submodule',
-            target_branch: 'master'
-          },
-          format: :json
+      get :pipelines, get_diff_params.merge(format: 'json')
 
       expect(response).to be_ok
       expect(json_response).to have_key 'pipelines'