Merge branch 'dm-parallel-diff-unchanged-line-comment' into 'master'

Don't display comment on unchanged line on both sides in parallel diff

Closes #33864

See merge request !12275

1 files changed, 10 insertions, 1 deletions

diff --git a/spec/helpers/diff_helper_spec.rb b/spec/helpers/diff_helper_spec.rb
index a74615e07f9..3ea0a7e2874 100644
--- a/spec/helpers/diff_helper_spec.rb
+++ b/spec/helpers/diff_helper_spec.rb
@@ -148,12 +148,21 @@ describe DiffHelper do
 
     it 'puts comments on added lines' do
       left = Gitlab::Diff::Line.new('\\nonewline', 'old-nonewline', 3, 3, 3)
-      right = Gitlab::Diff::Line.new('new line', 'add', 3, 3, 3)
+      right = Gitlab::Diff::Line.new('new line', 'new', 3, 3, 3)
 
       result = helper.parallel_diff_discussions(left, right, diff_file)
 
       expect(result).to eq([nil, 'comment'])
     end
+
+    it 'puts comments on unchanged lines' do
+      left = Gitlab::Diff::Line.new('unchanged line', nil, 3, 3, 3)
+      right = Gitlab::Diff::Line.new('unchanged line', nil, 3, 3, 3)
+
+      result = helper.parallel_diff_discussions(left, right, diff_file)
+
+      expect(result).to eq(['comment', nil])
+    end
   end
 
   describe "#diff_match_line" do