diff --git a/tests/phpunit/tests/admin/includes/misc/wpAdminCanonicalUrl.php b/tests/phpunit/tests/admin/includes/misc/wpAdminCanonicalUrl.php
new file mode 100644
index 0000000000000..b5113bbd0b3e3
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/misc/wpAdminCanonicalUrl.php
@@ -0,0 +1,134 @@
+<?php
+/**
+ * Test wp_admin_canonical_url().
+ *
+ * @group admin
+ * @group misc
+ *
+ * @covers ::wp_admin_canonical_url
+ */
+class Tests_Admin_Includes_Misc_WpAdminCanonicalUrl extends WP_UnitTestCase {
+
+	/**
+	 * Original $_SERVER values.
+	 *
+	 * @var array
+	 */
+	private $server_orig;
+
+	public function set_up() {
+		parent::set_up();
+		$this->server_orig = $_SERVER;
+	}
+
+	public function tear_down() {
+		$_SERVER = $this->server_orig;
+		parent::tear_down();
+	}
+
+	/**
+	 * Tests wp_admin_canonical_url().
+	 *
+	 * @ticket 65192
+	 *
+	 * @dataProvider data_wp_admin_canonical_url
+	 *
+	 * @param array  $server_vars $_SERVER variables to set.
+	 * @param string $expected    Expected output substring.
+	 */
+	public function test_wp_admin_canonical_url( array $server_vars, $expected ) {
+		foreach ( $server_vars as $key => $value ) {
+			$_SERVER[ $key ] = $value;
+		}
+
+		ob_start();
+		wp_admin_canonical_url();
+		$output = ob_get_clean();
+
+		$this->assertStringContainsString( $expected, $output );
+		$this->assertStringContainsString( '<script>', $output );
+	}
+
+	/**
+	 * Data provider for test_wp_admin_canonical_url.
+	 *
+	 * @return array<string, array{
+	 *     server_vars: array<string, string>,
+	 *     expected:    string
+	 * }>
+	 */
+	public function data_wp_admin_canonical_url(): array {
+		return array(
+			'no removable query args'            => array(
+				'server_vars' => array(
+					'HTTP_HOST'   => 'example.org',
+					'REQUEST_URI' => '/wp-admin/index.php',
+				),
+				'expected'    => 'href="http://example.org/wp-admin/index.php"',
+			),
+			'with removable query args'          => array(
+				'server_vars' => array(
+					'HTTP_HOST'   => 'example.org',
+					'REQUEST_URI' => '/wp-admin/index.php?settings-updated=true&other=arg',
+				),
+				'expected'    => 'href="http://example.org/wp-admin/index.php?other=arg"',
+			),
+			'with multiple removable query args' => array(
+				'server_vars' => array(
+					'HTTP_HOST'   => 'example.org',
+					'REQUEST_URI' => '/wp-admin/edit.php?trashed=1&locked=1&paged=2',
+				),
+				'expected'    => 'href="http://example.org/wp-admin/edit.php?paged=2"',
+			),
+			'with https'                         => array(
+				'server_vars' => array(
+					'HTTP_HOST'   => 'example.org',
+					'REQUEST_URI' => '/wp-admin/index.php',
+					'HTTPS'       => 'on',
+				),
+				'expected'    => 'href="https://example.org/wp-admin/index.php"',
+			),
+		);
+	}
+
+	/**
+	 * Tests wp_admin_canonical_url() when removable query args are filtered to be empty.
+	 *
+	 * @ticket 65192
+	 */
+	public function test_wp_admin_canonical_url_empty_removable_args() {
+		add_filter( 'removable_query_args', '__return_empty_array' );
+
+		ob_start();
+		wp_admin_canonical_url();
+		$output = ob_get_clean();
+
+		remove_filter( 'removable_query_args', '__return_empty_array' );
+
+		$this->assertEmpty( $output, 'Output should be empty when removable query args are filtered to be empty.' );
+	}
+
+	/**
+	 * Tests the wp_admin_canonical_url filter.
+	 *
+	 * @ticket 65192
+	 */
+	public function test_wp_admin_canonical_url_filter() {
+		$_SERVER['HTTP_HOST']   = 'example.org';
+		$_SERVER['REQUEST_URI'] = '/wp-admin/index.php?settings-updated=true';
+
+		add_filter( 'wp_admin_canonical_url', array( $this, 'filter_canonical_url' ) );
+
+		ob_start();
+		wp_admin_canonical_url();
+		$output = ob_get_clean();
+
+		remove_filter( 'wp_admin_canonical_url', array( $this, 'filter_canonical_url' ) );
+
+		$this->assertStringContainsString( 'href="https://custom.example.org/canonical"', $output );
+	}
+
+	public function filter_canonical_url() {
+		return 'https://custom.example.org/canonical';
+	}
+}