1 files changed, 11 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits_spec.rb b/spec/lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits_spec.rb
index 7cd2ce82eda..c0427639746 100644
--- a/spec/lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits_spec.rb
+++ b/spec/lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits_spec.rb
@@ -134,6 +134,17 @@ describe Gitlab::BackgroundMigration::DeserializeMergeRequestDiffsAndCommits do
       include_examples 'updated MR diff'
     end
 
+    context 'when the merge request diffs do not have a_mode and b_mode set' do
+      let(:commits) { merge_request_diff.commits.map(&:to_hash) }
+      let(:expected_diffs) { diffs_to_hashes(merge_request_diff.merge_request_diff_files) }
+
+      let(:diffs) do
+        expected_diffs.map { |diff| diff.except(:a_mode, :b_mode) }
+      end
+
+      include_examples 'updated MR diff'
+    end
+
     context 'when the merge request diffs have binary content' do
       let(:commits) { merge_request_diff.commits.map(&:to_hash) }
       let(:expected_diffs) { diffs }