Fix last tab is undefined

1 files changed, 5 insertions, 0 deletions

diff --git a/test/background/infrastructures/memory-storage.test.js b/test/background/infrastructures/memory-storage.test.js
index 5d62880..0fea895 100644
--- a/test/background/infrastructures/memory-storage.test.js
+++ b/test/background/infrastructures/memory-storage.test.js
@@ -15,6 +15,11 @@ describe("background/infrastructures/memory-storage", () => {
     expect(cache.get('object')).to.deep.equal({ hello: '123' });
   });
 
+  it('returns undefined if no keys', () => {
+    let cache = new MemoryStorage();
+    expect(cache.get('no-keys')).to.be.undefined;
+  })
+
   it('stored on shared memory', () => {
     let cache = new MemoryStorage();
     cache.set('red', 'apple');