1 files changed, 10 insertions, 0 deletions
diff --git a/spec/features/projects/diffs/diff_show_spec.rb b/spec/features/projects/diffs/diff_show_spec.rb
index e47f36c4b7a..56506ada3ce 100644
--- a/spec/features/projects/diffs/diff_show_spec.rb
+++ b/spec/features/projects/diffs/diff_show_spec.rb
@@ -174,4 +174,14 @@ RSpec.describe 'Diff file viewer', :js, :with_clean_rails_cache do
       end
     end
   end
+
+  context 'when the the encoding of the file is unsupported' do
+    before do
+      visit_commit('f05a98786e4274708e1fa118c7ad3a29d1d1b9a3')
+    end
+
+    it 'shows it is not diffable' do
+      expect(page).to have_content("File suppressed by a .gitattributes entry or the file's encoding is unsupported.")
+    end
+  end
 end