public function testExecuteInvokesTestersExecuteMethod()
 {
     $input = $this->getMock('Symfony\\Component\\Console\\Input\\InputInterface');
     $output = $this->getMock('Symfony\\Component\\Console\\Output\\OutputInterface');
     $tester = $this->getMock('ParaTest\\Console\\Testers\\Tester');
     $tester->expects($this->once())->method('execute')->with($this->equalTo($input), $this->equalTo($output));
     $command = new ParaTestCommand($tester);
     $command->execute($input, $output);
 }