fix error when using pubsub while plugin is disabled (#2966)

Author: rochdev

packages/datadog-instrumentations/src/google-cloud-pubsub.js

@@ -63,7 +63,7 @@ function wrapMethod (method) {
   const api = method.name
 
   return function (request) {
-    if (!requestStartCh.hasSubscribers) return request.apply(this, arguments)
+    if (!requestStartCh.hasSubscribers) return method.apply(this, arguments)
 
     const innerAsyncResource = new AsyncResource('bound-anonymous-fn')
 

packages/datadog-plugin-google-cloud-pubsub/test/index.spec.js

@@ -219,6 +219,20 @@ describe('Plugin', () => {
             return expectedSpanPromise
           })
         })
+
+        describe('when disabled', () => {
+          beforeEach(() => {
+            tracer.use('google-cloud-pubsub', false)
+          })
+
+          afterEach(() => {
+            tracer.use('google-cloud-pubsub', true)
+          })
+
+          it('should work normally', async () => {
+            await pubsub.createTopic(topicName)
+          })
+        })
       })
 
       describe('with configuration', () => {