From 618d1458201f68004f8ece29c9757078d3a8b4a6 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Wed, 6 May 2026 18:00:35 -0400
Subject: [PATCH 1/2] Add unit tests for wp_admin_viewport_meta() in
 wp-admin/includes/misc.php

---
 .../includes/misc/wpAdminViewportMeta.php     | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php

diff --git a/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php b/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php
new file mode 100644
index 0000000000000..9a85cfd6cc2b9
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php
@@ -0,0 +1,62 @@
+<?php
+/**
+ * Test wp_admin_viewport_meta().
+ *
+ * @group admin
+ * @group misc
+ */
+class Tests_wp_admin_viewport_meta extends WP_UnitTestCase {
+
+	/**
+	 * Test wp_admin_viewport_meta() output.
+	 *
+	 * @dataProvider data_wp_admin_viewport_meta
+	 *
+	 * @param string|null $filter_value The value to return from the filter, or null if no filter.
+	 * @param string      $expected     The expected output string.
+	 *
+	 * @return void
+	 */
+	public function test_wp_admin_viewport_meta( $filter_value, $expected ) {
+		if ( null !== $filter_value ) {
+			add_filter(
+				'admin_viewport_meta',
+				function() use ( $filter_value ) {
+					return $filter_value;
+				}
+			);
+		}
+
+		$this->expectOutputString( $expected );
+		wp_admin_viewport_meta();
+	}
+
+	/**
+	 * Data provider for test_wp_admin_viewport_meta.
+	 *
+	 * @return array<string, array{
+	 *     filter_value: string|null,
+	 *     expected:     string,
+	 * }>
+	 */
+	public function data_wp_admin_viewport_meta(): array {
+		return array(
+			'default_value'          => array(
+				'filter_value' => null,
+				'expected'     => '<meta name="viewport" content="width=device-width,initial-scale=1.0">',
+			),
+			'custom_filtered_value'  => array(
+				'filter_value' => 'width=device-width,initial-scale=2.0',
+				'expected'     => '<meta name="viewport" content="width=device-width,initial-scale=2.0">',
+			),
+			'empty_filtered_value'   => array(
+				'filter_value' => '',
+				'expected'     => '',
+			),
+			'escaped_filtered_value' => array(
+				'filter_value' => 'width=device-width; content="><script>alert(1)</script>',
+				'expected'     => '<meta name="viewport" content="' . esc_attr( 'width=device-width; content="><script>alert(1)</script>' ) . '">',
+			),
+		);
+	}
+}

From 1486e495df88f5c0d19d684df5321a8a7a8c67bd Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@gmail.com>
Date: Wed, 6 May 2026 18:06:02 -0400
Subject: [PATCH 2/2] Fix function declaration syntax in
 test_wp_admin_viewport_meta

---
 tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php b/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php
index 9a85cfd6cc2b9..fabbf184e88df 100644
--- a/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php
+++ b/tests/phpunit/tests/admin/includes/misc/wpAdminViewportMeta.php
@@ -21,7 +21,7 @@ public function test_wp_admin_viewport_meta( $filter_value, $expected ) {
 		if ( null !== $filter_value ) {
 			add_filter(
 				'admin_viewport_meta',
-				function() use ( $filter_value ) {
+				function () use ( $filter_value ) {
 					return $filter_value;
 				}
 			);