dnspec6.php

<?php

return
[
    'It is initializable' => function ()
    {
        $this->shouldHaveType('StringCalculator');
    },

    'It requires string input' => function ()
    {
        $this->shouldThrow('\InvalidArgumentException')->during('add', [null]);
    },

    'It adds 2 numbers separated by comma' => function ()
    {
        $this->add('1,2')->shouldReturn(3);
    },
];