MAGETWO-69808: Fix composer validation #9905

Author: Oleksii Korshenko

dev/tests/static/testsuite/Magento/Test/Integrity/ComposerTest.php

@@ -99,7 +99,12 @@ private function validateComposerJsonFile($path)
         /** @var \Magento\Framework\Composer\MagentoComposerApplicationFactory $appFactory */
         $appFactory = self::$objectManager->get(\Magento\Framework\Composer\MagentoComposerApplicationFactory::class);
         $app = $appFactory->create();
-        $app->runComposerCommand(['command' => 'validate'], $path);
+
+        try {
+            $app->runComposerCommand(['command' => 'validate'], $path);
+        } catch (\RuntimeException $exception) {
+            $this->fail($exception->getMessage());
+        }
     }
 
     /**