public function setUp()
{
$this->projectRoot = vfsStream::setup('project');
$this->installer = new ComponentInstaller(vfsStream::url('project'));
$this->composer = $this->prophesize(Composer::class);
$this->io = $this->prophesize(IOInterface::class);
$this->installer->activate($this->composer->reveal(), $this->io->reveal());
$this->installationManager = $this->prophesize(InstallationManager::class);
$this->composer->getInstallationManager()->willReturn($this->installationManager->reveal());
}