    public function it_makes_input_checkbox_tag()
    {
        $this->checkbox('name', 'value')
            ->make()
            ->shouldBe('<input type="checkbox" name="name" value="value" />');
        
        // checked
        $this->checkbox('name', 'value', true)
            ->make()
            ->shouldBe('<input type="checkbox" name="name" value="value" checked="checked" />');
    }