Add tests for newline handling of PRE,TEXTAREA

sirreal · sirreal · commit fd94649eda2a · 2026-02-05T12:54:33.000+01:00
diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php b/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php
@@ -321,4 +321,39 @@ public static function data_provider_serialize_doctype() {
 			'Double quotes in system ID' => array( '<!DOCTYPE html SYSTEM \'"quoted"\'\>', '<!DOCTYPE html SYSTEM \'"quoted"\'>' ),
 		);
 	}
+
+	/**
+	 * @ticket TBD
+	 *
+	 * @dataProvider data_provider_special_leading_newline_cases
+	 */
+	public function test_special_leading_newline_handling( string $input, string $expected ) {
+		$normalized = WP_HTML_Processor::normalize( $input );
+		$this->assertEqualHTML( $expected, $normalized );
+		$normalized_twice = WP_HTML_Processor::normalize( $normalized );
+		$this->assertEqualHTML( $expected, $normalized_twice );
+	}
+
+	/**
+	 */
+	public static function data_provider_special_leading_newline_cases() {
+		return array(
+			'Leading newline in PRE' => array(
+				"<pre>\nline 1\nline 2</pre>",
+				"<pre>line 1\nline 2</pre>",
+			),
+			'Double leading newline in PRE' => array(
+				"<pre>\n\nline 2\nline 3</pre>",
+				"<pre>\n\nline 2\nline 3</pre>",
+			),
+			'Leading newline in TEXTAREA' => array(
+				"<textarea>\nline 1\nline 2</textarea>",
+				"<textarea>line 1\nline 2</textarea>",
+			),
+			'Double leading newline in TEXTAREA' => array(
+				"<textarea>\n\nline 2\nline 3</textarea>",
+				"<textarea>\n\nline 2\nline 3</textarea>",
+			),
+		);
+	}
 }
