How can I test multiple possible valid values in phpunit?

Question

I have a simple method get_db_password() which can return a string or under some circumstances it could return null, either case should be considered a valid response.
What I am really testing for is that the script doesnt blow up if the getter is called.
How can I write a test/assertion - which either calls get_db_password() and asserts that the script didnt die, or that can test whether the response was either null or a string. e.g something like

$this->assertInternalType( "string || null", $this->config->get_db_password() );

Source code

<?php

class Config {

    /** @var string $db_password stored the database password */
    private $db_password;

    public function __construct() {

        $this->db_password = require(PROJ_DIR . "config/productions.php");
    }

    /**  @return string 
     */
    public function get_db_password() {
        return $this->db_password;
    }
}

test code

<?php

class ConfigTest extends PHPUnit\Framework\TestCase {

    public $config;

    public function test_get_db_password_returns_a_string_or_null() {

        $this->config = new Config;

        // how can I write this test?
        $this->assertInternalType('string || null', $this->config->get_db_password());
    }
}

the_velour_fog · Accepted Answer · 2017-05-25 04:18:13Z

1

I found this as a satisfactory solution

$this->assertTrue(is_string($pass) || $pass === null);

answered May 25, 2017 at 4:18

the_velour_fog

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1 Comment

Steve Moretz Over a year ago

It's creative but when your test fails you won't be able to tell, which condition was failed.

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