1 files changed, 18 insertions, 0 deletions
diff --git a/spec/models/discussion_spec.rb b/spec/models/discussion_spec.rb
index 021940be0c2..2b33de96e04 100644
--- a/spec/models/discussion_spec.rb
+++ b/spec/models/discussion_spec.rb
@@ -51,4 +51,22 @@ RSpec.describe Discussion do
       expect(policy).to be_a(NotePolicy)
     end
   end
+
+  describe '#cache_key' do
+    let(:notes_sha) { Digest::SHA1.hexdigest("#{first_note.id}:#{second_note.id}:#{third_note.id}") }
+
+    it 'returns the cache key with ID and latest updated note updated at' do
+      expect(subject.cache_key).to eq("#{described_class::CACHE_VERSION}:#{third_note.latest_cached_markdown_version}:#{subject.id}:#{notes_sha}:#{third_note.updated_at}:")
+    end
+
+    context 'when discussion is resolved' do
+      before do
+        subject.resolve!(first_note.author)
+      end
+
+      it 'returns the cache key with resolved at' do
+        expect(subject.cache_key).to eq("#{described_class::CACHE_VERSION}:#{third_note.latest_cached_markdown_version}:#{subject.id}:#{notes_sha}:#{third_note.updated_at}:#{subject.resolved_at}")
+      end
+    end
+  end
 end