1 files changed, 26 insertions, 0 deletions
diff --git a/spec/features/merge_request/user_expands_diff_spec.rb b/spec/features/merge_request/user_expands_diff_spec.rb
new file mode 100644
index 00000000000..3560b8d90bb
--- /dev/null
+++ b/spec/features/merge_request/user_expands_diff_spec.rb
@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe 'User expands diff', :js do
+  let(:project) { create(:project, :public, :repository) }
+  let(:merge_request) { create(:merge_request, source_branch: 'expand-collapse-files', source_project: project, target_project: project) }
+
+  before do
+    allow(Gitlab::Git::Diff).to receive(:size_limit).and_return(100.kilobytes)
+    allow(Gitlab::Git::Diff).to receive(:collapse_limit).and_return(10.kilobytes)
+
+    visit(diffs_project_merge_request_path(project, merge_request))
+
+    wait_for_requests
+  end
+
+  it 'allows user to expand diff' do
+    page.within find('[id="2f6fcd96b88b36ce98c38da085c795a27d92a3dd"]') do
+      click_link 'Click to expand it.'
+
+      wait_for_requests
+
+      expect(page).not_to have_content('Click to expand it.')
+      expect(page).to have_selector('.code')
+    end
+  end
+end