ConstantStringSniff: Take into account namespace prefixing

WordPressVIPMinimum/Sniffs/Constants/ConstantStringSniff.php

@@ -56,6 +56,12 @@ public function process_token( $stackPtr ) {
 		}
 
 		$nextToken = $this->phpcsFile->findNext( Tokens::$emptyTokens, $nextToken + 1, null, true, null, true );
+		$nextNextToken = $this->phpcsFile->findNext( Tokens::$emptyTokens, $nextToken + 1, null, true, null, true );
+
+		if ( T_NS_C === $this->tokens[ $nextToken ]['code'] && T_STRING_CONCAT === $this->tokens[ $nextNextToken ]['code'] ) {
+			// Namespacing being used, skip to next.
+			$nextToken = $this->phpcsFile->findNext( Tokens::$emptyTokens, $nextNextToken + 1, null, true, null, true );
+		}
 
 		if ( T_CONSTANT_ENCAPSED_STRING !== $this->tokens[ $nextToken ]['code'] ) {
 			$message = 'Constant name, as a string, should be used along with `%s()`.';

WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.inc

@@ -4,6 +4,12 @@ if ( ! defined( 'WPCOM_VIP' ) ) { // Okay.
 	define( 'WPCOM_VIP', true ); // Okay.
 }
 
-if ( ! defined( WPCOM_VIP ) ) { // NOK.
-	define( WPCOM_VIP ); // NOK.
-}
+if ( ! defined( WPCOM_VIP ) ) { // Error.
+	define( WPCOM_VIP ); // Error.
+}
+
+namespace Foo/Bar;
+const REST_ALLOWED_META_PREFIXES = [ 'foo-', 'bar-', 'baz-' ];
+if ( defined( __NAMESPACE__ . '\REST_ALLOWED_META_PREFIXES' ) && in_array( 'foo-', REST_ALLOWED_META_PREFIXES, true ) ) { // Ok.
+	define( __NAMESPACE__ . REST_ALLOWED_META_PREFIXES ); // Error.
+}

WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.php

@@ -23,8 +23,9 @@ class ConstantStringUnitTest extends AbstractSniffUnitTest {
 	 */
 	public function getErrorList() {
 		return [
-			7 => 1,
-			8 => 1,
+			7  => 1,
+			8  => 1,
+			14 => 1,
 		];
 	}