override onStart of TestSubscriber

Author: davidmoten

src/test/java/rx/internal/operators/OnSubscribeAmbTest.java

@@ -253,9 +253,11 @@ public void testSecondaryRequestsPropagatedToChildren() throws InterruptedExcept
         //this stream emits second
         Observable<Integer> o2 = Observable.from(Arrays.asList(4, 5, 6))
                 .delay(200, TimeUnit.MILLISECONDS).subscribeOn(Schedulers.computation());
-        TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
-        //before subscription request 1
-        ts.requestMore(1);
+        TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
+            @Override
+            public void onStart() {
+                request(1);
+            }};
         Observable.amb(o1, o2).subscribe(ts);
         // before first emission request 20 more
         // this request should suffice to emit all