1 files changed, 72 insertions, 0 deletions
diff --git a/spec/lib/gitlab/cache/json_cache_spec.rb b/spec/lib/gitlab/cache/json_cache_spec.rb
new file mode 100644
index 00000000000..05126319ef9
--- /dev/null
+++ b/spec/lib/gitlab/cache/json_cache_spec.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Cache::JsonCache, feature_category: :shared do
+  let_it_be(:broadcast_message) { create(:broadcast_message) }
+
+  let(:backend) { instance_double(ActiveSupport::Cache::RedisCacheStore).as_null_object }
+  let(:namespace) { 'geo' }
+  let(:key) { 'foo' }
+  let(:expanded_key) { "#{namespace}:#{key}:#{Gitlab.revision}" }
+
+  subject(:cache) { described_class.new(namespace: namespace, backend: backend) }
+
+  describe '#active?' do
+    context 'when backend respond to active? method' do
+      it 'delegates to the underlying cache implementation' do
+        backend = instance_double(Gitlab::NullRequestStore, active?: false)
+
+        cache = described_class.new(namespace: namespace, backend: backend)
+
+        expect(cache.active?).to eq(false)
+      end
+    end
+
+    context 'when backend does not respond to active? method' do
+      it 'returns true' do
+        backend = instance_double(ActiveSupport::Cache::RedisCacheStore)
+
+        cache = described_class.new(namespace: namespace, backend: backend)
+
+        expect(cache.active?).to eq(true)
+      end
+    end
+  end
+
+  describe '#expire' do
+    it 'calls delete from the backend on the cache_key' do
+      cache = Class.new(described_class) do
+        def expanded_cache_key(_key)
+          ['_expanded_cache_key_']
+        end
+      end.new(namespace: namespace, backend: backend)
+
+      cache.expire(key)
+
+      expect(backend).to have_received(:delete).with('_expanded_cache_key_')
+    end
+
+    it 'raises an error' do
+      expect { cache.expire(key) }.to raise_error(NoMethodError)
+    end
+  end
+
+  describe '#read' do
+    it 'raises an error' do
+      expect { cache.read(key) }.to raise_error(NoMethodError)
+    end
+  end
+
+  describe '#write' do
+    it 'raises an error' do
+      expect { cache.write(key, true) }.to raise_error(NoMethodError)
+    end
+  end
+
+  describe '#fetch' do
+    it 'raises an error' do
+      expect { cache.fetch(key) }.to raise_error(NoMethodError)
+    end
+  end
+end