From ce73de3685774e98a641d177c8c4179a50ad17a8 Mon Sep 17 00:00:00 2001
From: shail-mehta <shailmehta25@gmail.com>
Date: Sat, 31 Oct 2026 05:05:57 +0000
Subject: [PATCH 1/2] Tests: Cover wp_ext2type().

Add unit tests for known extension type mapping and unknown extensions.\n\nSee #65819.
---
 tests/phpunit/tests/functions/wpExt2type.php | 49 ++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 tests/phpunit/tests/functions/wpExt2type.php

diff --git a/tests/phpunit/tests/functions/wpExt2type.php b/tests/phpunit/tests/functions/wpExt2type.php
new file mode 100644
index 0000000000000..9d1c081289059
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpExt2type.php
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * Tests for wp_ext2type().
+ *
+ * @group functions
+ *
+ * @covers ::wp_ext2type
+ */
+class Tests_Functions_WpExt2type extends WP_UnitTestCase {
+
+	/**
+	 * Tests that known extensions map to the expected file type.
+	 *
+	 * @ticket 65819
+	 *
+	 * @dataProvider data_known_extensions
+	 *
+	 * @param string $ext      File extension.
+	 * @param string $expected File type.
+	 */
+	public function test_returns_type_for_known_extension( $ext, $expected ) {
+		$this->assertSame( $expected, wp_ext2type( $ext ) );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array[]
+	 */
+	public static function data_known_extensions() {
+		return array(
+			'image lowercase' => array( 'jpg', 'image' ),
+			'image uppercase' => array( 'PNG', 'image' ),
+			'audio'           => array( 'mp3', 'audio' ),
+			'video'           => array( 'mp4', 'video' ),
+			'document'        => array( 'pdf', 'document' ),
+		);
+	}
+
+	/**
+	 * Tests that an unknown extension returns null.
+	 *
+	 * @ticket 65819
+	 */
+	public function test_returns_null_for_unknown_extension() {
+		$this->assertNull( wp_ext2type( 'notarealext' ) );
+	}
+}

From 232359825cfba7ffdd226b8c3ae38bd5c3061f89 Mon Sep 17 00:00:00 2001
From: shail-mehta <shailmehta25@gmail.com>
Date: Sun, 1 Nov 2026 05:22:39 +0000
Subject: [PATCH 2/2] Tests: Strengthen wp_ext2type() coverage in
 Tests_Functions.

Add literal extension mappings to the existing helper test and drop the dedicated class.

See #65819.
---
 tests/phpunit/tests/functions.php            |  9 ++++
 tests/phpunit/tests/functions/wpExt2type.php | 49 --------------------
 2 files changed, 9 insertions(+), 49 deletions(-)
 delete mode 100644 tests/phpunit/tests/functions/wpExt2type.php

diff --git a/tests/phpunit/tests/functions.php b/tests/phpunit/tests/functions.php
index 9939678366265..41ce50e90e575 100644
--- a/tests/phpunit/tests/functions.php
+++ b/tests/phpunit/tests/functions.php
@@ -1147,12 +1147,21 @@ public function test_wp_get_ext_types() {
 
 	/**
 	 * @ticket 35987
+	 * @ticket 65819
+	 * @covers ::wp_ext2type
 	 */
 	public function test_wp_ext2type() {
 		$extensions = wp_get_ext_types();
 
 		$this->assertNotEmpty( $extensions );
 
+		// Literal mappings stay independent of the current registry contents.
+		$this->assertSame( 'image', wp_ext2type( 'jpg' ) );
+		$this->assertSame( 'image', wp_ext2type( 'PNG' ) );
+		$this->assertSame( 'audio', wp_ext2type( 'mp3' ) );
+		$this->assertSame( 'video', wp_ext2type( 'mp4' ) );
+		$this->assertSame( 'document', wp_ext2type( 'pdf' ) );
+
 		foreach ( $extensions as $type => $extension_list ) {
 			foreach ( $extension_list as $extension ) {
 				$this->assertSame( $type, wp_ext2type( $extension ) );
diff --git a/tests/phpunit/tests/functions/wpExt2type.php b/tests/phpunit/tests/functions/wpExt2type.php
deleted file mode 100644
index 9d1c081289059..0000000000000
--- a/tests/phpunit/tests/functions/wpExt2type.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-/**
- * Tests for wp_ext2type().
- *
- * @group functions
- *
- * @covers ::wp_ext2type
- */
-class Tests_Functions_WpExt2type extends WP_UnitTestCase {
-
-	/**
-	 * Tests that known extensions map to the expected file type.
-	 *
-	 * @ticket 65819
-	 *
-	 * @dataProvider data_known_extensions
-	 *
-	 * @param string $ext      File extension.
-	 * @param string $expected File type.
-	 */
-	public function test_returns_type_for_known_extension( $ext, $expected ) {
-		$this->assertSame( $expected, wp_ext2type( $ext ) );
-	}
-
-	/**
-	 * Data provider.
-	 *
-	 * @return array[]
-	 */
-	public static function data_known_extensions() {
-		return array(
-			'image lowercase' => array( 'jpg', 'image' ),
-			'image uppercase' => array( 'PNG', 'image' ),
-			'audio'           => array( 'mp3', 'audio' ),
-			'video'           => array( 'mp4', 'video' ),
-			'document'        => array( 'pdf', 'document' ),
-		);
-	}
-
-	/**
-	 * Tests that an unknown extension returns null.
-	 *
-	 * @ticket 65819
-	 */
-	public function test_returns_null_for_unknown_extension() {
-		$this->assertNull( wp_ext2type( 'notarealext' ) );
-	}
-}