WP/EnqueuedResourceParameters: fix handling of non-lowercased null

This commit fixes how the sniff handles non-lowercased `null` when passed as the value of the `$ver` parameter. Now the sniff consistently handles `null` regardless of the case and always returns a warning. Before, it would return a warning only for lower-cased `null` and an error for all other variations of `null`.

Author: rodrigoprimo

WordPress/Sniffs/WP/EnqueuedResourceParametersSniff.php

@@ -141,7 +141,7 @@ public function process_parameters( $stackPtr, $group_name, $matched_content, $p
 			}
 		}
 
-		if ( false === $version_param || 'null' === $version_param['clean'] ) {
+		if ( false === $version_param || 'null' === strtolower( $version_param['clean'] ) ) {
 			$type = 'script';
 			if ( strpos( $matched_content, '_style' ) !== false ) {
 				$type = 'style';

WordPress/Tests/WP/EnqueuedResourceParametersUnitTest.1.inc

@@ -95,3 +95,6 @@ wp_register_script( 'someScript-js', 'https://example.com/someScript.js' , array
 wp_register_script( 'someScript-js', 'https://example.com/someScript.js' , array( 'jquery' ), (double) 0, true ); // Error - 0, false or NULL are not allowed.
 
 wp_register_script( 'someScript-js', 'https://example.com/someScript.js' , array( 'jquery' ), (binary) 0, true ); // Error - 0, false or NULL are not allowed.
+
+// Safeguard handling of non-lowercase `null`.
+wp_register_script( 'someScript-js', 'https://example.com/someScript.js' , array( 'jquery' ), NULL, true ); // Warning - 0, false or NULL are not allowed.

WordPress/Tests/WP/EnqueuedResourceParametersUnitTest.php

@@ -70,14 +70,15 @@ public function getWarningList( $testFile = '' ) {
 		switch ( $testFile ) {
 			case 'EnqueuedResourceParametersUnitTest.1.inc':
 				return array(
-					3  => 2,
-					11 => 1,
-					32 => 1,
-					39 => 2,
-					42 => 1,
-					45 => 1,
-					66 => 2,
-					77 => 1,
+					3   => 2,
+					11  => 1,
+					32  => 1,
+					39  => 2,
+					42  => 1,
+					45  => 1,
+					66  => 2,
+					77  => 1,
+					100 => 1,
 				);
 
 			default: