From 0d3319ebc730ccd7573212ca44f3353ea1651e41 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 5 May 2026 18:08:27 -0400
Subject: [PATCH] Add unit tests for wp_make_plugin_file_tree() in
 wp-admin/includes/misc.php

---
 .../includes/misc/wpMakePluginFileTree.php    | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php

diff --git a/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php b/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php
new file mode 100644
index 0000000000000..7489ce44a498e
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * Tests for the wp_make_plugin_file_tree() function.
+ *
+ * @group admin
+ * @group admin-includes
+ * @covers ::wp_make_plugin_file_tree
+ */
+class Tests_wp_make_plugin_file_tree extends WP_UnitTestCase {
+
+	/**
+	 * Tests wp_make_plugin_file_tree() with various inputs using a data provider.
+	 *
+	 * @ticket 65176
+	 * @dataProvider data_wp_make_plugin_file_tree
+	 *
+	 * @param array $plugin_editable_files List of plugin file paths.
+	 * @param array $expected              The expected tree structure.
+	 */
+	public function test_wp_make_plugin_file_tree( $plugin_editable_files, $expected ) {
+		$this->assertSame( $expected, wp_make_plugin_file_tree( $plugin_editable_files ) );
+	}
+
+	/**
+	 * Data provider for test_wp_make_plugin_file_tree.
+	 *
+	 * @return array<string, array{
+	 *     plugin_editable_files: array<int, string>,
+	 *     expected:              array<string, mixed>,
+	 * }>
+	 */
+	public function data_wp_make_plugin_file_tree(): array {
+		return array(
+			'empty_list'          => array(
+				'plugin_editable_files' => array(),
+				'expected'              => array(),
+			),
+			'flat_list'           => array(
+				'plugin_editable_files' => array(
+					'plugin/plugin.php',
+					'plugin/readme.txt',
+				),
+				'expected'              => array(
+					'plugin.php' => 'plugin/plugin.php',
+					'readme.txt' => 'plugin/readme.txt',
+				),
+			),
+			'nested_list'         => array(
+				'plugin_editable_files' => array(
+					'plugin/plugin.php',
+					'plugin/includes/class-plugin.php',
+					'plugin/includes/functions.php',
+				),
+				'expected'              => array(
+					'plugin.php' => 'plugin/plugin.php',
+					'includes'   => array(
+						'class-plugin.php' => 'plugin/includes/class-plugin.php',
+						'functions.php'    => 'plugin/includes/functions.php',
+					),
+				),
+			),
+			'deeply_nested_list'  => array(
+				'plugin_editable_files' => array(
+					'plugin/plugin.php',
+					'plugin/src/components/button/index.js',
+				),
+				'expected'              => array(
+					'plugin.php' => 'plugin/plugin.php',
+					'src'        => array(
+						'components' => array(
+							'button' => array(
+								'index.js' => 'plugin/src/components/button/index.js',
+							),
+						),
+					),
+				),
+			),
+			'multiple_base_names' => array(
+				'plugin_editable_files' => array(
+					'plugin-a/plugin.php',
+					'plugin-b/plugin.php',
+				),
+				'expected'              => array(
+					'plugin.php' => 'plugin-b/plugin.php', // Note: wp_make_plugin_file_tree replaces the file name if multiple base paths exist but result in same relative path.
+				),
+			),
+		);
+	}
+}