From c9396b96303cda5bb8960d189a8320a14663332b Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 18:06:34 -0400
Subject: [PATCH 1/6] Add unit tests for iis7_rewrite_rule_exists() in
 src/wp-admin/includes/misc.php

---
 .../includes/misc/iis7RewriteRuleExists.php   | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php

diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
new file mode 100644
index 0000000000000..6989769298855
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -0,0 +1,99 @@
+<?php
+
+/**
+ * Tests for the iis7_rewrite_rule_exists() function.
+ *
+ * @group admin
+ *
+ * @covers ::iis7_rewrite_rule_exists
+ */
+class Tests_iis7_rewrite_rule_exists extends WP_UnitTestCase {
+
+	/**
+	 * Path to the temporary file.
+	 *
+	 * @var string
+	 */
+	private $temp_file;
+
+	public function set_up() {
+		parent::set_up();
+
+		require_once ABSPATH . 'wp-admin/includes/misc.php';
+
+		$this->temp_file = wp_tempnam( 'web.config' );
+	}
+
+	public function tear_down() {
+		if ( file_exists( $this->temp_file ) ) {
+			unlink( $this->temp_file );
+		}
+
+		parent::tear_down();
+	}
+
+	/**
+	 * Tests that iis7_rewrite_rule_exists() correctly identifies the existence of rules.
+	 *
+	 * @ticket 65148
+	 *
+	 * @dataProvider data_iis7_rewrite_rule_exists
+	 *
+	 * @phpstan-return array<string, array{expected: bool, content: string}>
+	 *
+	 * @param bool   $expected Whether the rule is expected to exist.
+	 * @param string $content  The XML content of the file.
+	 */
+	public function test_iis7_rewrite_rule_exists( $expected, $content ) {
+		if ( 'Not XML' === $content ) {
+			@file_put_contents( $this->temp_file, $content );
+			$this->assertSame( $expected, @iis7_rewrite_rule_exists( $this->temp_file ) );
+		} else {
+			file_put_contents( $this->temp_file, $content );
+			$this->assertSame( $expected, iis7_rewrite_rule_exists( $this->temp_file ) );
+		}
+	}
+
+	/**
+	 * Data provider for test_iis7_rewrite_rule_exists.
+	 *
+	 * @return array<string, array{expected: bool, content: string}>
+	 */
+	public function data_iis7_rewrite_rule_exists() {
+		return array(
+			'Rule with name "wordpress" exists' => array(
+				'expected' => true,
+				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress" /></rules></rewrite></system.webServer></configuration>',
+			),
+			'Rule with name "WordPress" exists' => array(
+				'expected' => true,
+				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="WordPress" /></rules></rewrite></system.webServer></configuration>',
+			),
+			'Rule with name starting with "wordpress" exists' => array(
+				'expected' => true,
+				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress-rules" /></rules></rewrite></system.webServer></configuration>',
+			),
+			'Rule does not exist' => array(
+				'expected' => false,
+				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="other-rule" /></rules></rewrite></system.webServer></configuration>',
+			),
+			'Empty configuration' => array(
+				'expected' => false,
+				'content'  => '<configuration />',
+			),
+			'Invalid XML' => array(
+				'expected' => false,
+				'content'  => 'Not XML',
+			),
+		);
+	}
+
+	/**
+	 * Tests that iis7_rewrite_rule_exists() returns false if the file does not exist.
+	 *
+	 * @ticket 65148
+	 */
+	public function test_iis7_rewrite_rule_exists_non_existent_file() {
+		$this->assertFalse( iis7_rewrite_rule_exists( '/non/existent/file' ) );
+	}
+}

From 0764cb9e70af70e490d02ddc7a86d4c17e3e5e6c Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 18:10:16 -0400
Subject: [PATCH 2/6] Add return type declaration for
 data_iis7_rewrite_rule_exists() test method

---
 .../phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index 6989769298855..f69a36ae5a2e0 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -59,7 +59,7 @@ public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 	 *
 	 * @return array<string, array{expected: bool, content: string}>
 	 */
-	public function data_iis7_rewrite_rule_exists() {
+	public function data_iis7_rewrite_rule_exists(): array {
 		return array(
 			'Rule with name "wordpress" exists' => array(
 				'expected' => true,

From bacdfcfc12c437a3b10cfb3ec985d5e8a2dfd49d Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 18:14:30 -0400
Subject: [PATCH 3/6] Remove error suppression from iis7_rewrite_rule_exists()
 tests and align array keys

---
 .../admin/includes/misc/iis7RewriteRuleExists.php  | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index f69a36ae5a2e0..bc938a30dd64d 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -46,8 +46,8 @@ public function tear_down() {
 	 */
 	public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 		if ( 'Not XML' === $content ) {
-			@file_put_contents( $this->temp_file, $content );
-			$this->assertSame( $expected, @iis7_rewrite_rule_exists( $this->temp_file ) );
+			file_put_contents( $this->temp_file, $content );
+			$this->assertSame( $expected, iis7_rewrite_rule_exists( $this->temp_file ) );
 		} else {
 			file_put_contents( $this->temp_file, $content );
 			$this->assertSame( $expected, iis7_rewrite_rule_exists( $this->temp_file ) );
@@ -61,11 +61,11 @@ public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 	 */
 	public function data_iis7_rewrite_rule_exists(): array {
 		return array(
-			'Rule with name "wordpress" exists' => array(
+			'Rule with name "wordpress" exists'               => array(
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule with name "WordPress" exists' => array(
+			'Rule with name "WordPress" exists'               => array(
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="WordPress" /></rules></rewrite></system.webServer></configuration>',
 			),
@@ -73,15 +73,15 @@ public function data_iis7_rewrite_rule_exists(): array {
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress-rules" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule does not exist' => array(
+			'Rule does not exist'                             => array(
 				'expected' => false,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="other-rule" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Empty configuration' => array(
+			'Empty configuration'                             => array(
 				'expected' => false,
 				'content'  => '<configuration />',
 			),
-			'Invalid XML' => array(
+			'Invalid XML'                                     => array(
 				'expected' => false,
 				'content'  => 'Not XML',
 			),

From 29d33fd0f61b7b79860f40733b68a6e1cff15ca5 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 18:20:12 -0400
Subject: [PATCH 4/6] Reorder and update test data array in
 data_iis7_rewrite_rule_exists() for consistency

---
 .../tests/admin/includes/misc/iis7RewriteRuleExists.php   | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index bc938a30dd64d..78b798fa8661e 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -61,6 +61,10 @@ public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 	 */
 	public function data_iis7_rewrite_rule_exists(): array {
 		return array(
+			'Rule with name starting with "wordpress" exists' => array(
+				'expected' => true,
+				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress-rules" /></rules></rewrite></system.webServer></configuration>',
+			),
 			'Rule with name "wordpress" exists'               => array(
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress" /></rules></rewrite></system.webServer></configuration>',
@@ -69,10 +73,6 @@ public function data_iis7_rewrite_rule_exists(): array {
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="WordPress" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule with name starting with "wordpress" exists' => array(
-				'expected' => true,
-				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress-rules" /></rules></rewrite></system.webServer></configuration>',
-			),
 			'Rule does not exist'                             => array(
 				'expected' => false,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="other-rule" /></rules></rewrite></system.webServer></configuration>',

From 5f3dddefe1ce8b4264e6577b8887461777913ac1 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 19:17:00 -0400
Subject: [PATCH 5/6] Suppress errors in iis7_rewrite_rule_exists() test method
 to prevent warnings

---
 src/wp-admin/includes/misc.php                                 | 1 -
 .../tests/admin/includes/misc/iis7RewriteRuleExists.php        | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/wp-admin/includes/misc.php b/src/wp-admin/includes/misc.php
index 3724684ffd428..61e9a09e2b799 100644
--- a/src/wp-admin/includes/misc.php
+++ b/src/wp-admin/includes/misc.php
@@ -833,7 +833,6 @@ function iis7_rewrite_rule_exists( $filename ) {
 	}
 
 	$doc = new DOMDocument();
-
 	if ( $doc->load( $filename ) === false ) {
 		return false;
 	}
diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index 78b798fa8661e..44cd0412ec75f 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -47,7 +47,8 @@ public function tear_down() {
 	public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 		if ( 'Not XML' === $content ) {
 			file_put_contents( $this->temp_file, $content );
-			$this->assertSame( $expected, iis7_rewrite_rule_exists( $this->temp_file ) );
+			// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
+			$this->assertSame( $expected, @iis7_rewrite_rule_exists( $this->temp_file ) );
 		} else {
 			file_put_contents( $this->temp_file, $content );
 			$this->assertSame( $expected, iis7_rewrite_rule_exists( $this->temp_file ) );

From 6abc172cd53ca11710d2475f8870fd4016d947c5 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 28 Apr 2026 19:34:51 -0400
Subject: [PATCH 6/6] Align spacing in test data array for
 data_iis7_rewrite_rule_exists()

---
 .../admin/includes/misc/iis7RewriteRuleExists.php      | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index 44cd0412ec75f..83532b1f51983 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -66,23 +66,23 @@ public function data_iis7_rewrite_rule_exists(): array {
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress-rules" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule with name "wordpress" exists'               => array(
+			'Rule with name "wordpress" exists' => array(
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="wordpress" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule with name "WordPress" exists'               => array(
+			'Rule with name "WordPress" exists' => array(
 				'expected' => true,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="WordPress" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Rule does not exist'                             => array(
+			'Rule does not exist'               => array(
 				'expected' => false,
 				'content'  => '<configuration><system.webServer><rewrite><rules><rule name="other-rule" /></rules></rewrite></system.webServer></configuration>',
 			),
-			'Empty configuration'                             => array(
+			'Empty configuration'               => array(
 				'expected' => false,
 				'content'  => '<configuration />',
 			),
-			'Invalid XML'                                     => array(
+			'Invalid XML'                       => array(
 				'expected' => false,
 				'content'  => 'Not XML',
 			),