Remove a warning

Author: bigmontz

packages/neo4j-driver/test/result.test.js

@@ -67,13 +67,19 @@ describe('#integration result stream', () => {
   })
 
   it('should handle missing onCompleted', done => {
+    const state = {
+      done: false
+    }
     session.run('RETURN 1').subscribe({
       onNext: record => {
         expect(record.get(0).toInt()).toEqual(1)
-        done()
+        if (!state.done) { done() }
+        state.done = true
       },
       onError: error => {
-        done.fail(error)
+        if (!state.done) { done.fail(error) }
+
+        state.done = true
       }
     })
   })