Always fetch MR latest version when creating suggestions

This is an issue that can only be seen through EE. Further
details can be seen on
https://gitlab.com/gitlab-org/gitlab-ee/issues/9876. In general
we should always use the latest diff version of a file in order
to both create and apply suggestions.

1 files changed, 11 insertions, 0 deletions

diff --git a/spec/services/suggestions/apply_service_spec.rb b/spec/services/suggestions/apply_service_spec.rb
index 8e77d582eb4..fe85b5c9065 100644
--- a/spec/services/suggestions/apply_service_spec.rb
+++ b/spec/services/suggestions/apply_service_spec.rb
@@ -362,6 +362,17 @@ describe Suggestions::ApplyService do
       project.add_maintainer(user)
     end
 
+    context 'diff file was not found' do
+      it 'returns error message' do
+        expect(suggestion.note).to receive(:latest_diff_file) { nil }
+
+        result = subject.execute(suggestion)
+
+        expect(result).to eq(message: 'The file was not found',
+                             status: :error)
+      end
+    end
+
     context 'suggestion was already applied' do
       it 'returns success status' do
         result = subject.execute(suggestion)