Add test coverage for setting preload link

westonruter · westonruter · commit af9182b4ac1a · 2025-01-22T11:03:41.000-08:00
diff --git a/plugins/optimization-detective/tests/test-cases/preload-link/buffer.html b/plugins/optimization-detective/tests/test-cases/preload-link/buffer.html
@@ -0,0 +1,11 @@
+<html lang="en">
+	<head>
+		<meta charset="utf-8">
+		<title>...</title>
+	</head>
+	<body>
+		<div id="page">
+			<img src="https://example.com/image.jpg" alt="" width="100" height="100">
+		</div>
+	</body>
+</html>
diff --git a/plugins/optimization-detective/tests/test-cases/preload-link/expected.html b/plugins/optimization-detective/tests/test-cases/preload-link/expected.html
@@ -0,0 +1,13 @@
+<html lang="en">
+	<head>
+		<meta charset="utf-8">
+		<title>...</title>
+	<link data-od-added-tag rel="preload" as="image" href="https://example.com/image.jpg">
+</head>
+	<body>
+		<div id="page">
+			<img data-od-xpath="/HTML/BODY/DIV/*[1][self::IMG]" src="https://example.com/image.jpg" alt="" width="100" height="100">
+		</div>
+	<script type="module">/* import detect ... */</script>
+</body>
+</html>
diff --git a/plugins/optimization-detective/tests/test-cases/preload-link/set-up.php b/plugins/optimization-detective/tests/test-cases/preload-link/set-up.php
@@ -0,0 +1,24 @@
+<?php
+return static function (): void {
+
+	add_action(
+		'od_register_tag_visitors',
+		static function ( OD_Tag_Visitor_Registry $registry ): void {
+			$registry->register(
+				'img-preload',
+				static function ( OD_Tag_Visitor_Context $context ): bool {
+					if ( 'IMG' === $context->processor->get_tag() ) {
+						$context->link_collection->add_link(
+							array(
+								'rel'  => 'preload',
+								'as'   => 'image',
+								'href' => $context->processor->get_attribute( 'src' ),
+							)
+						);
+					}
+					return false;
+				}
+			);
+		}
+	);
+};
