Improve fiber tests to avoid now unneeded await() calls

Author: clue

tests/AppTest.php

@@ -877,11 +877,6 @@ public function testHandleRequestWithMatchingRouteReturnsPromiseResolvingWithRes
             "OK\n"
         ));
 
-        // await next tick: https://github.com/reactphp/async/issues/27
-        await(new Promise(function ($resolve) {
-            Loop::futureTick($resolve);
-        }));
-
         /** @var ResponseInterface $response */
         $this->assertInstanceOf(ResponseInterface::class, $response);
         $this->assertEquals(200, $response->getStatusCode());
@@ -1152,11 +1147,6 @@ public function testHandleRequestWithMatchingRouteReturnsPromiseWhichFulfillsWit
 
         $deferred->reject($exception);
 
-        // await next tick: https://github.com/reactphp/async/issues/27
-        await(new Promise(function ($resolve) {
-            Loop::futureTick($resolve);
-        }));
-
         /** @var ResponseInterface $response */
         $this->assertInstanceOf(ResponseInterface::class, $response);
         $this->assertEquals(500, $response->getStatusCode());

tests/FiberHandlerTest.php

@@ -157,11 +157,6 @@ public function testInvokeWithHandlerReturningResponseAfterAwaitingPendingPromis
 
         $deferred->resolve($response);
 
-        // await next tick: https://github.com/reactphp/async/issues/27
-        await(new Promise(function ($resolve) {
-            Loop::futureTick($resolve);
-        }));
-
         $this->assertSame($response, $ret);
     }
 }