public function testImplode()
{
$data = new Collection([['name' => 'taylor', 'email' => 'foo'], ['name' => 'dayle', 'email' => 'bar']]);
$this->assertEquals('foobar', $data->implode('email'));
$this->assertEquals('foo,bar', $data->implode('email', ','));
$data = new Collection(['taylor', 'dayle']);
$this->assertEquals('taylordayle', $data->implode(''));
$this->assertEquals('taylor,dayle', $data->implode(','));
}