Run tests on PHPUnit 9

Author: SimonFrings

composer.json

@@ -24,6 +24,6 @@
         "react/promise": "^2.0 || ^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0 || ^6.0 || ^5.0 || ^4.8.35"
+        "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.35"
     }
 }

tests/DeferredShellTest.php

@@ -8,7 +8,10 @@ class DeferredShellTest extends TestCase
 {
     private $stream;
 
-    public function setUp()
+    /**
+     * @before
+     */
+    public function setUpStream()
     {
         $this->stream = $this->getMockBuilder('React\Stream\DuplexStreamInterface')->getMock();
     }

tests/FunctionalTest.php

@@ -10,7 +10,10 @@ class FunctionalTest extends TestCase
     private $loop;
     private $launcher;
 
-    public function setUp()
+    /**
+     * @before
+     */
+    public function setUpLauncher()
     {
         $this->loop = Factory::create();
         $this->launcher = new ProcessLauncher($this->loop);

tests/ProcessLauncherTest.php

@@ -9,7 +9,10 @@ class ProcessLauncherTest extends TestCase
     private $loop;
     private $processLauncher;
 
-    public function setUp()
+    /**
+     * @before
+     */
+    public function setUpProcessLauncher()
     {
         $this->loop = $this->getMockBuilder('React\EventLoop\LoopInterface')->getMock();
         $this->processLauncher = new ProcessLauncher($this->loop);

tests/TestCase.php

@@ -54,7 +54,13 @@ protected function expectCallableOnceParameter($type)
 
     protected function createCallableMock()
     {
-        return $this->getMockBuilder('stdClass')->setMethods(array('__invoke'))->getMock();
+        if (method_exists('PHPUnit\Framework\MockObject\MockBuilder', 'addMethods')) {
+            // PHPUnit 9+
+            return $this->getMockBuilder('stdClass')->addMethods(array('__invoke'))->getMock();
+        } else {
+            // legacy PHPUnit 4 - PHPUnit 8
+            return $this->getMockBuilder('stdClass')->setMethods(array('__invoke'))->getMock();
+        }
     }
 
     protected function expectPromiseResolve($promise)