Update test

Use composer install to dump autoload, as by default composer 2 is not
generating the dev autoload rules

Author: dantleech

tests/Integration/Composer/ComposerClassToFileTest.php

@@ -6,6 +6,7 @@
 use Phpactor\ClassFileConverter\Domain\ClassName;
 use Phpactor\ClassFileConverter\Domain\FilePathCandidates;
 use Phpactor\ClassFileConverter\Adapter\Composer\ComposerClassToFile;
+use Prophecy\PhpUnit\ProphecyTrait;
 use Psr\Log\LoggerInterface;
 use Prophecy\Argument;
 
@@ -14,6 +15,8 @@
  */
 class ComposerClassToFileTest extends ComposerTestCase
 {
+    use ProphecyTrait;
+
     /**
      * @var LoggerInterface
      */

tests/Integration/Composer/ComposerTestCase.php

@@ -23,7 +23,7 @@ protected function loadExample($composerFile): void
         $filesystem->mirror($projectPath, $this->workspacePath());
         $filesystem->copy($composerPath, $this->workspacePath().'/composer.json');
         chdir($this->workspacePath());
-        exec('composer dumpautoload 2> /dev/null');
+        exec('composer install 2> /dev/null');
     }
 
     protected function getClassLoader()