Harmonize with WordPress/gutenberg#76782 tests

Author: sirreal

tests/phpunit/tests/css-api/wpCssBuilder.php

@@ -18,44 +18,42 @@ public function test_string_escaping( string $input, string $expected ): void {
 	}
 
 	/**
-	 * Data provider for individual escape mappings and basic cases.
+	 * Data provider for string escaping cases.
 	 *
 	 * @return array
 	 */
 	public static function data_string_escaping(): array {
 		return array(
-			// Basic behavior.
-			'empty string'          => array( '', '""' ),
-			'simple ASCII'          => array( 'hello', '"hello"' ),
-			'spaces preserved'      => array( 'hello world', '"hello world"' ),
-			'numbers pass through'  => array( '12345', '"12345"' ),
-			'non-ASCII passthrough' => array( 'café', '"café"' ),
+			// Passthrough — no escaping needed, only quoting.
+			'empty string'            => array( '', '""' ),
+			'simple ASCII'            => array( 'Arial', '"Arial"' ),
+			'spaces preserved'        => array( 'Exo 2', '"Exo 2"' ),
+			'leading/trailing spaces' => array( '  Arial  ', '"  Arial  "' ),
+			'whitespace-only'         => array( '   ', '"   "' ),
+			'numbers pass through'    => array( '12345', '"12345"' ),
+			'non-ASCII passthrough'   => array( 'café', '"café"' ),
 
-			// Backslash escaping.
-			'single backslash'      => array( '\\', '"\5C "' ),
-			'double backslash'      => array( '\\\\', '"\5C \5C "' ),
+			// Backslash escaping — must happen first to prevent double-escaping.
+			'backslash'               => array( 'Back\\Slash', '"Back\5C Slash"' ),
+			'double backslash'        => array( '\\\\', '"\5C \5C "' ),
+			'backslash before quote'  => array( "a\\'b", '"a\5C \27 b"' ),
 
-			// NULL byte.
-			'null byte'             => array( "\0", "\"\u{FFFD}\"" ),
+			// NULL byte → U+FFFD replacement character.
+			'null byte'               => array( "a\0b", "\"a\u{FFFD}b\"" ),
 
-			// Newline variants.
-			'LF'                    => array( "\n", '"\A "' ),
-			'CR'                    => array( "\r", '"\A "' ),
-			'CRLF'                  => array( "\r\n", '"\A "' ),
-			'form feed'             => array( "\f", '"\A "' ),
+			// Newline normalization — all variants become \A escape.
+			'LF'                      => array( "a\nb", '"a\A b"' ),
+			'CR'                      => array( "a\rb", '"a\A b"' ),
+			'CRLF as single escape'   => array( "a\r\nb", '"a\A b"' ),
+			'form feed'               => array( "a\fb", '"a\A b"' ),
 
 			// HTML-problematic characters.
-			'less than'             => array( '<', '"\3C "' ),
-			'greater than'          => array( '>', '"\3E "' ),
-			'ampersand'             => array( '&', '"\26 "' ),
+			'HTML characters < > &'   => array( 'a<b>c&d', '"a\3C b\3E c\26 d"' ),
 
 			// CSS-problematic characters.
-			'comma'                 => array( ',', '"\2C "' ),
-			'semicolon'             => array( ';', '"\3B "' ),
-			'open brace'            => array( '{', '"\7B "' ),
-			'close brace'           => array( '}', '"\7D "' ),
-			'double quote'          => array( '"', '"\22 "' ),
-			'single quote'          => array( "'", '"\27 "' ),
+			'CSS syntax , ; { }'      => array( 'a,b;c{d}', '"a\2C b\3B c\7B d\7D "' ),
+			'single quote'            => array( "CSS's strings", '"CSS\27 s strings"' ),
+			'double quote'            => array( 'Say "Hi"', '"Say \22 Hi\22 "' ),
 		);
 	}