1 files changed, 65 insertions, 0 deletions
diff --git a/spec/frontend/lib/utils/cache_spec.js b/spec/frontend/lib/utils/cache_spec.js
new file mode 100644
index 00000000000..2fe02a7592c
--- /dev/null
+++ b/spec/frontend/lib/utils/cache_spec.js
@@ -0,0 +1,65 @@
+import Cache from '~/lib/utils/cache';
+
+describe('Cache', () => {
+  const dummyKey = 'just some key';
+  const dummyValue = 'more than a value';
+  let cache;
+
+  beforeEach(() => {
+    cache = new Cache();
+  });
+
+  describe('get', () => {
+    it('return cached data', () => {
+      cache.internalStorage[dummyKey] = dummyValue;
+
+      expect(cache.get(dummyKey)).toBe(dummyValue);
+    });
+
+    it('returns undefined for missing data', () => {
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+      expect(cache.get(dummyKey)).toBe(undefined);
+    });
+  });
+
+  describe('hasData', () => {
+    it('return true for cached data', () => {
+      cache.internalStorage[dummyKey] = dummyValue;
+
+      expect(cache.hasData(dummyKey)).toBe(true);
+    });
+
+    it('returns false for missing data', () => {
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+      expect(cache.hasData(dummyKey)).toBe(false);
+    });
+  });
+
+  describe('remove', () => {
+    it('removes data from cache', () => {
+      cache.internalStorage[dummyKey] = dummyValue;
+
+      cache.remove(dummyKey);
+
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+    });
+
+    it('does nothing for missing data', () => {
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+
+      cache.remove(dummyKey);
+
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+    });
+
+    it('does not remove wrong data', () => {
+      cache.internalStorage[dummyKey] = dummyValue;
+      cache.internalStorage[dummyKey + dummyKey] = dummyValue + dummyValue;
+
+      cache.remove(dummyKey);
+
+      expect(cache.internalStorage[dummyKey]).toBe(undefined);
+      expect(cache.internalStorage[dummyKey + dummyKey]).toBe(dummyValue + dummyValue);
+    });
+  });
+});