test.patch

diff --git a/system-test/storage.ts b/system-test/storage.ts
index 15465b9..a096b65 100644
--- a/system-test/storage.ts
+++ b/system-test/storage.ts
@@ -111,6 +111,7 @@ describe('storage', () => {
             process.env.GOOGLE_APPLICATION_CREDENTIALS;
         delete process.env.GOOGLE_APPLICATION_CREDENTIALS;
 
+        delete require.cache[require.resolve('../src')];
         const {Storage} = require('../src');
         storageWithoutAuth = new Storage();
 
@@ -154,7 +155,7 @@ describe('storage', () => {
         file = bucket.file(privateFile.id);
       });
 
-      it('should not download a file', done => {
+      it.only('should not download a file', done => {
         file.download(err => {
           assert(err.message.indexOf('does not have storage.objects.get') > -1);
           done();