diff --git a/test/datasource/npm/index.spec.js b/test/datasource/npm/index.spec.js
index 6cc1d150fd1871679cf5ea3ebb01a247af22f6f4..bd25f9e7bb63051cedec672c289a084c0a4bed02 100644
--- a/test/datasource/npm/index.spec.js
+++ b/test/datasource/npm/index.spec.js
@@ -365,10 +365,12 @@ describe('api/npm', () => {
     expect(res1).toEqual(res2);
   });
   it('should use global cache', async () => {
-    const dummyValue = 'abc123';
-    await global.renovateCache.set('datasource-npm', 'foobar', dummyValue, 10);
+    const dep = {
+      name: 'abc123',
+    };
+    await global.renovateCache.set('datasource-npm', 'foobar', dep, 10);
     const res = await npm.getPkgReleases({ lookupName: 'foobar' });
-    expect(res).toEqual(dummyValue);
+    expect(res).toEqual(dep);
   });
   it('should fetch package info from custom registry', async () => {
     nock('https://npm.mycustomregistry.com')