Throw an exception if symfony/process is not installed

Author: franmomu

src/Test/MakerTestCase.php

@@ -15,6 +15,7 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\MakerBundle\MakerInterface;
 use Symfony\Bundle\MakerBundle\Str;
+use Symfony\Component\Process\Process;
 
 abstract class MakerTestCase extends TestCase
 {
@@ -32,6 +33,10 @@ abstract public function getTestDetails();
 
     protected function executeMakerCommand(MakerTestDetails $testDetails)
     {
+        if (!class_exists(Process::class)) {
+            throw new \LogicException('The MakerTestCase cannot be run as the Process component is not installed. Try running "compose require --dev symfony/process".');
+        }
+
         if (!$testDetails->isSupportedByCurrentPhpVersion()) {
             $this->markTestSkipped();
         }