From dd59b9ad4f81c96f20b6d4cf683730750e091a9c Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@git.wordpress.org>
Date: Tue, 5 May 2026 17:30:34 -0400
Subject: [PATCH 1/2] Add unit tests for saveDomDocument() in
 wp-admin/includes/misc.php

---
 .../admin/includes/misc/saveDomDocument.php   | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 tests/phpunit/tests/admin/includes/misc/saveDomDocument.php

diff --git a/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php b/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php
new file mode 100644
index 0000000000000..74d9103f437ab
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * Tests for the saveDomDocument() function.
+ *
+ * @group admin
+ *
+ * @covers ::saveDomDocument
+ */
+class Tests_saveDomDocument extends WP_UnitTestCase {
+	/**
+	 * Path to the temporary file.
+	 *
+	 * @var string
+	 */
+	private $temp_file;
+
+	/**
+	 * Set up the test environment.
+	 */
+	public function set_up() {
+		parent::set_up();
+		require_once ABSPATH . 'wp-admin/includes/misc.php';
+		$this->temp_file = wp_tempnam( 'saveDomDocument' );
+	}
+
+	/**
+	 * Clean up the test environment.
+	 */
+	public function tear_down() {
+		if ( file_exists( $this->temp_file ) ) {
+			unlink( $this->temp_file );
+		}
+		parent::tear_down();
+	}
+
+	/**
+	 * Tests that saveDomDocument() correctly saves a DOMDocument to a file.
+	 *
+	 * @ticket 65173
+	 */
+	public function test_saveDomDocument_saves_file() {
+		$doc  = new DOMDocument();
+		$root = $doc->createElement( 'root' );
+		$doc->appendChild( $root );
+
+		saveDomDocument( $doc, $this->temp_file );
+
+		$this->assertFileExists( $this->temp_file, 'The file should be saved.' );
+		$this->assertXmlStringEqualsXmlFile( $this->temp_file, $doc->saveXML(), 'The saved file content should match the XML.' );
+	}
+
+	/**
+	 * Tests that saveDomDocument() converts LF to CRLF.
+	 *
+	 * @ticket 65173
+	 */
+	public function test_saveDomDocument_converts_line_endings() {
+		$doc = new DOMDocument();
+		// Create a multi-line XML.
+		$root = $doc->createElement( 'root' );
+		$child1 = $doc->createElement( 'child', 'one' );
+		$child2 = $doc->createElement( 'child', 'two' );
+		$root->appendChild( $child1 );
+		$root->appendChild( $child2 );
+		$doc->appendChild( $root );
+		$doc->formatOutput = true;
+
+		saveDomDocument( $doc, $this->temp_file );
+
+		$content = file_get_contents( $this->temp_file );
+
+		// The function replaces [^\r]\n with \r\n.
+		// Note: DOMDocument::saveXML() usually outputs LF on Linux environments where these tests run in Docker.
+
+		$this->assertStringContainsString( "\r\n", $content, 'The output should contain CRLF line endings.' );
+		$this->assertStringNotContainsString( "(?<!\r)\n", $content, 'The output should not contain bare LF line endings.' );
+	}
+}

From c571c267257cda0b60488c974a202071b0e1b8c5 Mon Sep 17 00:00:00 2001
From: Paul Bearne <pbearne@gmail.com>
Date: Tue, 5 May 2026 18:03:49 -0400
Subject: [PATCH 2/2] Fix formatting of root element creation in test

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

diff --git a/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php b/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php
index 74d9103f437ab..ccb5038c65951 100644
--- a/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php
+++ b/tests/phpunit/tests/admin/includes/misc/saveDomDocument.php
@@ -57,7 +57,7 @@ public function test_saveDomDocument_saves_file() {
 	public function test_saveDomDocument_converts_line_endings() {
 		$doc = new DOMDocument();
 		// Create a multi-line XML.
-		$root = $doc->createElement( 'root' );
+		$root   = $doc->createElement( 'root' );
 		$child1 = $doc->createElement( 'child', 'one' );
 		$child2 = $doc->createElement( 'child', 'two' );
 		$root->appendChild( $child1 );