Rewrite tests for PHPUnit 6

Author: VolCh

composer.json

@@ -13,7 +13,7 @@
         "symfony/console": "~2.3 || ~3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.4"
+        "phpunit/phpunit": "~4.8.36 || ~5.7 || ~6.4"
     },
     "autoload": {
         "psr-4": {

tests/Stecman/Component/Symfony/Console/BashCompletion/Common/CompletionHandlerTestCase.php

@@ -2,14 +2,15 @@
 
 namespace Stecman\Component\Symfony\Console\BashCompletion\Tests\Common;
 
+use PHPUnit\Framework\TestCase;
 use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Stecman\Component\Symfony\Console\BashCompletion\CompletionHandler;
 use Symfony\Component\Console\Application;
 
 /**
  * Base test case for running CompletionHandlers
  */
-abstract class CompletionHandlerTestCase extends \PHPUnit_Framework_TestCase
+abstract class CompletionHandlerTestCase extends TestCase
 {
     /**
      * @var Application

tests/Stecman/Component/Symfony/Console/BashCompletion/CompletionContextTest.php

@@ -2,10 +2,11 @@
 
 namespace Stecman\Component\Symfony\Console\BashCompletion\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 use Stecman\Component\Symfony\Console\BashCompletion\EnvironmentCompletionContext;
 
-class CompletionContextTest extends \PHPUnit_Framework_TestCase
+class CompletionContextTest extends TestCase
 {
 
     public function testWordBreakSplit()

tests/Stecman/Component/Symfony/Console/BashCompletion/HookFactoryTest.php

@@ -2,9 +2,10 @@
 
 namespace Stecman\Component\Symfony\Console\BashCompletion\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Stecman\Component\Symfony\Console\BashCompletion\HookFactory;
 
-class HookFactoryTest extends \PHPUnit_Framework_TestCase
+class HookFactoryTest extends TestCase
 {
     /**
      * @var HookFactory
@@ -91,9 +92,7 @@ protected function assertSyntaxIsValid($code, $syntaxCheckCommand, $context)
 
             $status = proc_close($process);
 
-            if ($status !== 0) {
-                $this->fail("Syntax check for $context failed:\n$output");
-            }
+            $this->assertSame(0, $status, "Syntax check for $context failed:\n$output");
         } else {
             throw new \RuntimeException("Failed to start process with command '$syntaxCheckCommand'");
         }