public function test_ms_files_logs_but_doesnt_display_errors() {
    /*
		 * Global constants can't be mocked in PHPUnit, so this can only run with the expected
		 * values already set in `wp-tests-config.php`. Unfortunately, that means it won't run in
		 * automated workflows, but it's still useful when testing locally.
		 *
		 * It may be possible to enable automated workflows by mocking `define()`, or by setting up
		 * addition automated flows that initialize the tests with different values for the constants.
		 * At the moment, though, neither of those seem to provide enough benefit to justify the time
		 * investment.
		 *
		 * @link https://theaveragedev.com/mocking-constants-in-tests/
		 */
    if ( true !== WP_DEBUG || true !== WP_DEBUG_DISPLAY || true !== WP_DEBUG_LOG ) {
      $this->markTestSkipped( 'Test requires setting `WP_DEBUG_*` constants in `wp-tests-config.php` to expected values.' );
    }

    // `display_errors` should be _on_ because of `WP_DEBUG_DISPLAY`.
    wp_debug_mode();

    $this->assertSame( E_ALL, (int) ini_get( 'error_reporting' ) );
    $this->assertSame( '1', ini_get( 'display_errors' ) );
    $this->assertSame( '1', ini_get( 'log_errors' ) );
    $this->assertStringContainsString( 'debug.log', ini_get( 'error_log' ) );

    // `display_errors` should be _off_ now, because of `MS_FILES_REQUEST`.
    define( 'MS_FILES_REQUEST', true );
    wp_debug_mode();

    $this->assertSame( E_ALL, (int) ini_get( 'error_reporting' ) );
    $this->assertSame( '0', ini_get( 'display_errors' ) );
    $this->assertSame( '1', ini_get( 'log_errors' ) );
    $this->assertStringContainsString( 'debug.log', ini_get( 'error_log' ) );
  }