public function testExport()
{
Artisan::call('ab:install');
Experiment::find('a')->update(['visitors' => 153, 'engagement' => 35]);
Goal::create(['name' => 'foo', 'experiment' => 'a', 'count' => 42]);
$output = new Symfony\Component\Console\Output\BufferedOutput();
Artisan::call('ab:export', [], $output);
$report = $output->fetch();
$this->assertContains('Foo', $report);
$this->assertContains('153', $report);
$this->assertContains('35', $report);
$this->assertContains('42', $report);
$output = new Symfony\Component\Console\Output\BufferedOutput();
Artisan::call('ab:export', ['file' => '/tmp/test.csv'], $output);
$report = $output->fetch();
$this->assertContains('Creating /tmp/test.csv', $report);
}