Suppress test when env vars are not available. (GoogleCloudPlatform#123)

Author: Takashi Matsuo

appengine/flexible/cloudsql/tests/LocalTest.php

@@ -32,6 +32,11 @@ public function createApplication()
         $app['mysql.dsn'] = getenv('MYSQL_DSN');
         $app['mysql.user'] = getenv('MYSQL_USER');
         $app['mysql.password'] = getenv('MYSQL_PASSWORD');
+        if ($app['mysql.dsn'] === false ||
+            $app['mysql.user'] === false ||
+            $app['mysql.password'] === false) {
+            $this->markTestSkipped('set the MYSQL_DSN, MYSQL_USER and MYSQL_PASSWORD environment variables');
+        }
         return $app;
     }