Hide remove source branch button when new commit is added to branch

Fixes #3339

This MR hides the 'Remove source branch' button when a new commit is added to the source branch

1 files changed, 7 insertions, 1 deletions

diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 46f2f20b986..f9d0e1029d6 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -226,9 +226,15 @@ describe MergeRequest, models: true do
       expect(subject.can_remove_source_branch?(user2)).to be_falsey
     end
 
-    it "is can be removed in all other cases" do
+    it "can be removed if the last commit is the head of the source branch" do
+      allow(subject.source_project).to receive(:commit).and_return(subject.last_commit)
+
       expect(subject.can_remove_source_branch?(user)).to be_truthy
     end
+
+    it "cannot be removed if the last commit is not also the head of the source branch" do
+      expect(subject.can_remove_source_branch?(user)).to be_falsey
+    end
   end
 
   describe "#reset_merge_when_build_succeeds" do