1 files changed, 138 insertions, 0 deletions
diff --git a/spec/lib/gitlab/repository_cache_adapter_spec.rb b/spec/lib/gitlab/repository_cache_adapter_spec.rb
index 5bd4d6c6a48..0295138fc3a 100644
--- a/spec/lib/gitlab/repository_cache_adapter_spec.rb
+++ b/spec/lib/gitlab/repository_cache_adapter_spec.rb
@@ -65,6 +65,144 @@ describe Gitlab::RepositoryCacheAdapter do
     end
   end
 
+  describe '#cache_method_output_asymmetrically', :use_clean_rails_memory_store_caching, :request_store do
+    let(:request_store_cache) { repository.send(:request_store_cache) }
+
+    context 'with a non-existing repository' do
+      let(:project) { create(:project) } # No repository
+      let(:object) { double }
+
+      subject do
+        repository.cache_method_output_asymmetrically(:cats) do
+          object.cats_call_stub
+        end
+      end
+
+      it 'returns the output of the original method' do
+        expect(object).to receive(:cats_call_stub).and_return('output')
+
+        expect(subject).to eq('output')
+      end
+    end
+
+    context 'with a method throwing a non-existing-repository error' do
+      subject do
+        repository.cache_method_output_asymmetrically(:cats) do
+          raise Gitlab::Git::Repository::NoRepository
+        end
+      end
+
+      it 'returns nil' do
+        expect(subject).to eq(nil)
+      end
+
+      it 'does not cache the data' do
+        subject
+
+        expect(repository.instance_variable_defined?(:@cats)).to eq(false)
+        expect(cache.exist?(:cats)).to eq(false)
+      end
+    end
+
+    context 'with an existing repository' do
+      let(:object) { double }
+
+      context 'when it returns truthy' do
+        before do
+          expect(object).to receive(:cats).once.and_return('truthy output')
+        end
+
+        it 'caches the output in RequestStore' do
+          expect do
+            repository.cache_method_output_asymmetrically(:cats) { object.cats }
+          end.to change { request_store_cache.read(:cats) }.from(nil).to('truthy output')
+        end
+
+        it 'caches the output in RepositoryCache' do
+          expect do
+            repository.cache_method_output_asymmetrically(:cats) { object.cats }
+          end.to change { cache.read(:cats) }.from(nil).to('truthy output')
+        end
+      end
+
+      context 'when it returns false' do
+        before do
+          expect(object).to receive(:cats).once.and_return(false)
+        end
+
+        it 'caches the output in RequestStore' do
+          expect do
+            repository.cache_method_output_asymmetrically(:cats) { object.cats }
+          end.to change { request_store_cache.read(:cats) }.from(nil).to(false)
+        end
+
+        it 'does NOT cache the output in RepositoryCache' do
+          expect do
+            repository.cache_method_output_asymmetrically(:cats) { object.cats }
+          end.not_to change { cache.read(:cats) }.from(nil)
+        end
+      end
+    end
+  end
+
+  describe '#memoize_method_output' do
+    let(:fallback) { 10 }
+
+    context 'with a non-existing repository' do
+      let(:project) { create(:project) } # No repository
+
+      subject do
+        repository.memoize_method_output(:cats, fallback: fallback) do
+          repository.cats_call_stub
+        end
+      end
+
+      it 'returns the fallback value' do
+        expect(subject).to eq(fallback)
+      end
+
+      it 'avoids calling the original method' do
+        expect(repository).not_to receive(:cats_call_stub)
+
+        subject
+      end
+
+      it 'does not set the instance variable' do
+        subject
+
+        expect(repository.instance_variable_defined?(:@cats)).to eq(false)
+      end
+    end
+
+    context 'with a method throwing a non-existing-repository error' do
+      subject do
+        repository.memoize_method_output(:cats, fallback: fallback) do
+          raise Gitlab::Git::Repository::NoRepository
+        end
+      end
+
+      it 'returns the fallback value' do
+        expect(subject).to eq(fallback)
+      end
+
+      it 'does not set the instance variable' do
+        subject
+
+        expect(repository.instance_variable_defined?(:@cats)).to eq(false)
+      end
+    end
+
+    context 'with an existing repository' do
+      it 'sets the instance variable' do
+        repository.memoize_method_output(:cats, fallback: fallback) do
+          'block output'
+        end
+
+        expect(repository.instance_variable_get(:@cats)).to eq('block output')
+      end
+    end
+  end
+
   describe '#expire_method_caches' do
     it 'expires the caches of the given methods' do
       expect(cache).to receive(:expire).with(:rendered_readme)