Fix PHPUnit warnings for deprecated PHPUnit_Framework_TestCase::getMock()

Author: jsor

tests/React/Promise/DeferredPromiseTest.php

@@ -11,7 +11,9 @@ class DeferredPromiseTest extends TestCase
     /** @test */
     public function shouldForwardToDeferred()
     {
-        $mock = $this->getMock('React\\Promise\\Deferred');
+        $mock = $this
+            ->getMockBuilder('React\\Promise\\Deferred')
+            ->getMock();
         $mock
             ->expects($this->once())
             ->method('then')
@@ -24,7 +26,9 @@ public function shouldForwardToDeferred()
     /** @test */
     public function shouldForwardCancelToDeferred()
     {
-        $mock = $this->getMock('React\\Promise\\Deferred');
+        $mock = $this
+            ->getMockBuilder('React\\Promise\\Deferred')
+            ->getMock();
         $mock
             ->expects($this->once())
             ->method('cancel');

tests/React/Promise/DeferredResolverTest.php

@@ -11,7 +11,9 @@ class DeferredResolverTest extends TestCase
     /** @test */
     public function shouldForwardToDeferred()
     {
-        $mock = $this->getMock('React\\Promise\\Deferred');
+        $mock = $this
+            ->getMockBuilder('React\\Promise\\Deferred')
+            ->getMock();
         $mock
             ->expects($this->once())
             ->method('resolve')

tests/React/Promise/LazyPromiseTest.php

@@ -104,7 +104,9 @@ public function shouldInvokeCancellationHandlerAndStayPendingWhenCallingCancel()
     /** @test */
     public function shouldNotInvokeCancellationHandlerIfPromiseIsNotCancellable()
     {
-        $mock = $this->getMock('React\\Promise\\PromiseInterface');
+        $mock = $this
+            ->getMockBuilder('React\\Promise\\PromiseInterface')
+            ->getMock();
 
         $factory = function () use ($mock){
             return $mock;

tests/React/Promise/TestCase.php

@@ -36,7 +36,9 @@ public function expectCallableNever()
 
     public function createCallableMock()
     {
-        return $this->getMock('React\\Promise\Stub\CallableStub');
+        return $this
+            ->getMockBuilder('React\\Promise\Stub\CallableStub')
+            ->getMock();
     }
 
     public function invalidCallbackDataProvider()