TestVarDumper.php

<?php

declare (strict_types=1);
namespace Drupal\TestTools;

use Symfony\Component\VarDumper\Cloner\VarCloner;
use Symfony\Component\VarDumper\Dumper\CliDumper;
use Symfony\Component\VarDumper\Dumper\HtmlDumper;

/**
 * Provides handlers for the Symfony VarDumper to work within tests.
 *
 * This allows the dump() function to produce output on the terminal without
 * causing PHPUnit to complain.
 */
class TestVarDumper {
    
    /**
     * A CLI handler for \Symfony\Component\VarDumper\VarDumper.
     */
    public static function cliHandler($var) {
        $cloner = new VarCloner();
        $dumper = new CliDumper();
        fwrite(STDERR, "\n");
        $dumper->setColors(TRUE);
        $dumper->dump($cloner->cloneVar($var), function ($line, $depth, $indent_pad) {
            // A negative depth means "end of dump".
            if ($depth >= 0) {
                // Adds a two spaces indentation to the line.
                fwrite(STDERR, str_repeat($indent_pad, $depth) . $line . "\n");
            }
        });
    }
    
    /**
     * A HTML handler for \Symfony\Component\VarDumper\VarDumper.
     */
    public static function htmlHandler($var) {
        $cloner = new VarCloner();
        $dumper = new HtmlDumper();
        $dumper->dump($cloner->cloneVar($var));
    }

}