Don't require wp-config to be read-only for wp config has

Author: pwtyler

features/config-has.feature

@@ -15,6 +15,14 @@ Feature: Check whether the wp-config.php file or the wp-custom-config.php file h
     Then STDOUT should be empty
     And the return code should be 0
 
+  Scenario: Check for the existance of an existing wp-config.php constant in a read-only file system
+    Given a WP install
+
+    When I run `chmod -w wp-config.php`
+    And I try `wp config has DB_NAME`
+    Then STDOUT should be empty
+    And the return code should be 0
+
   @custom-config-file
   Scenario: Check the existence of an existing wp-custom-config.php constant or variable
     Given an empty directory

src/Config_Command.php

@@ -818,7 +818,7 @@ public function has( $args, $assoc_args ) {
 		$type                = Utils\get_flag_value( $assoc_args, 'type' );
 
 		try {
-			$config_transformer = new WPConfigTransformer( $path );
+			$config_transformer = new WPConfigTransformer( $path, true );
 
 			switch ( $type ) {
 				case 'all':