Adding test coverage

Author: dpanta94

src/Schema/Columns/Contracts/Column.php

@@ -35,6 +35,7 @@ abstract class Column implements Column_Interface, Indexable {
 		'CURRENT_TIMESTAMP',
 		'CURRENT_DATE',
 		'CURRENT_TIME',
+		'NULL',
 	];
 
 	/**

src/Schema/Indexes/Contracts/Abstract_Index.php

@@ -51,6 +51,15 @@ abstract class Abstract_Index implements Index {
 	 */
 	protected string $type;
 
+	/**
+	 * Constructor.
+	 *
+	 * @param string $name The name of the index.
+	 */
+	public function __construct( string $name = '' ) {
+		$this->name = $name;
+	}
+
 	/**
 	 * Get the name of the index.
 	 *

src/Schema/Indexes/Fulltext_Index.php

@@ -16,6 +16,10 @@
 /**
  * Class Fulltext_Index
  *
+ * Fulltext indexes are only supporting in MySQL 5.6+.
+ *
+ * They should be avoided for projects that are usable by the whole WP community for now.
+ *
  * @since TBD
  *
  * @package StellarWP\Schema\Indexes

src/Schema/Tables/Table_Schema.php

@@ -164,7 +164,7 @@ protected function validate_indexes(): void {
 			}
 		}
 
-		if ( array_values( $indexed_columns ) !== array_unique( array_values( $indexed_columns ) ) ) {
+		if ( array_values( $indexed_columns ) !== array_unique( array_values( $indexed_columns ), SORT_REGULAR ) ) {
 			throw new RuntimeException( 'Multiple indexes with the same column combinations.' );
 		}
 	}