test: fix assertCanonical expected value to use path only

assertCanonical() compares against the path component of the redirect
URL, not the full URL. Use parse_url() to extract the path from
wp_get_attachment_url().

Author: Claude

tests/phpunit/tests/canonical/attachmentRedirect.php

@@ -46,9 +46,10 @@ public function test_pretty_permalink_attachment_redirects_when_pages_disabled()
 		update_option( 'wp_attachment_pages_enabled', 0 );
 		$this->set_permalink_structure( '/%postname%/' );
 
-		$expected_url = wp_get_attachment_url( self::$attachment->ID );
+		// assertCanonical compares against the path component only.
+		$expected_path = parse_url( wp_get_attachment_url( self::$attachment->ID ), PHP_URL_PATH );
 
-		$this->assertCanonical( '/test-image-jpg/', $expected_url );
+		$this->assertCanonical( '/test-image-jpg/', $expected_path );
 	}
 
 	/**
@@ -58,8 +59,9 @@ public function test_query_var_attachment_redirects_when_pages_disabled() {
 		update_option( 'wp_attachment_pages_enabled', 0 );
 		$this->set_permalink_structure( '/%postname%/' );
 
-		$expected_url = wp_get_attachment_url( self::$attachment->ID );
+		// assertCanonical compares against the path component only.
+		$expected_path = parse_url( wp_get_attachment_url( self::$attachment->ID ), PHP_URL_PATH );
 
-		$this->assertCanonical( '/?attachment_id=' . self::$attachment->ID, $expected_url );
+		$this->assertCanonical( '/?attachment_id=' . self::$attachment->ID, $expected_path );
 	}
 }