Fix error on test:all command.

RoboFile.php

@@ -66,8 +66,8 @@ class RoboFile extends \Robo\Tasks {
   }
 
   function testAll() {
-    $this->_exec('vendor/bin/codecept build');
     $this->loadEnv();
+    $this->_exec('vendor/bin/codecept build');
     $this->taskexec('phantomjs --webdriver=4444')
       ->background()
       ->run();

tests/_bootstrap.php

@@ -3,14 +3,7 @@
 $console = new \Codeception\Lib\Console\Output([]);
 
 $console->writeln('Loading WP core...');
-$wordpress_path = getenv('WP_TEST_PATH');
-if ($wordpress_path) {
-  if (file_exists($wordpress_path . '/wp-load.php')) {
-    require_once(getenv('WP_TEST_PATH') . '/wp-load.php');
-  }
-} else {
-  throw new Exception("You need to specify the path to your WordPress installation\n`WP_TEST_PATH` in your .env file");
-}
+require_once(getenv('WP_TEST_PATH') . '/wp-load.php');
 
 $console->writeln('Cleaning up database...');
 $models = array(