<?php

class TestMyModel extends PHPUnit_Framework_TestCase{
    /**
        * @dataProvider myProvider
        */
    public function testMyFunctionOnlyAcceptsPositiveIntegers($a){
        if(!is_int($a) || $a < 0 || is_string($a)){
            $this->setExpectedException('\Exception');
        }

        $val = $this->model->myFunction($a);
        $this->assertEquals(true, $val);
    }

    public function myProvider(){
        return array(
            array(1),
            array(1.1),
            array('a'),
            array(-23)
        );
    }
}

?>