How do I pass parameters in PHP unit testing - php

Question

I am trying to learn how to create unit tests for my custom "framework" and here is a method that verifies the email address when user is registering.
private function verifyEmail()
{
if(empty($this->email) || empty($this->email_repeat)) {
throw new \Exception('please enter email');
}
if($this->email != $this->email_repeat) {
throw new \Exception('emails don\'t match');
}
if(!filter_var($this->email, FILTER_VALIDATE_EMAIL)) {
throw new \Exception('E-mail is invalid');
}
$isTaken = $this->db->getRow("SELECT COUNT(*) as count FROM users WHERE email = ?", [$this->email]);
if($isTaken->count > 0){
throw new \Exception('E-mail is taken');
}
}
And here is the unit test
class RegisterTest extends \PHPUnit\Framework\TestCase
{
public function testVerifyEmail() {
// what do i type here?
}
}
So, what do I type in the testVerifyEmail() method to pass an email to be tested? I am going through the documentation but as a newbie the information is overwhelming and I can't find a solution.

Answer 1

You can use PhpUnit DataProvider to provide parameters for your test methods.
https://phpunit.de/manual/6.5/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.data-providers
The example here will execute testMethod 4 times (one for each $data item).
<?php
use PHPUnit\Framework\TestCase;
class DataTest extends TestCase
{
/**
* #dataProvider myProvider
*/
public function testMethod($a, $b, $expected)
{
var_dump($a,$b,$expected);
//... your assertions here
}
public function myProvider()
{
$data = [
//each item represents the related method parameter
//the first time $a = 'valueOfA-0', $b='valueOfB-0',$expected='valueOfExpected-0'
//and so on, for each array
['valueOfA-0', 'valueOfB-0', 'valueOfExpected-0'],
['valueOfA-1', 'valueOfB-1', 'valueOfExpected-1'],
['valueOfA-2', 'valueOfB-2', 'valueOfExpected-2'],
['valueOfA-3', 'valueOfB-3', 'valueOfExpected-3'],
];
return $data;
}
}
//values of testMethod parameters each time
//$a = 'valueOfA-0', $b='valueOfB-0', $expected='valueOfExpected-0'
//$a = 'valueOfA-1', $b='valueOfB-1', $expected='valueOfExpected-1'
//$a = 'valueOfA-2', $b='valueOfB-2', $expected='valueOfExpected-2'
//$a = 'valueOfA-3', $b='valueOfB-3', $expected='valueOfExpected-3'