public function testDumpTraceOutDir()
{
$process = $this->phpbench('xdebug:trace benchmarks/set1/BenchmarkBench.php --dump --filter=benchDoNothing --outdir=foobar');
$this->assertExitCode(0, $process);
$this->assertContains('<trace', $process->getOutput());
$this->assertFileExists('foobar');
}