phpunitHow to use PHPUnit assert to check for exceptions?

PHPUnit provides a convenient way to check for exceptions using the assertThrow() method. This method takes two parameters: the expected exception class and a callable that should throw the exception.

<?php

use PHPUnit\Framework\TestCase;

class ExceptionTest extends TestCase
{
    public function testException()
    {
        $this->expectException(\InvalidArgumentException::class);
        throw new \InvalidArgumentException('Exception message');
    }
}

The above example will throw an \InvalidArgumentException and the test will pass.

Code explanation

1. use PHPUnit\Framework\TestCase; - imports the TestCase class from the PHPUnit framework.
2. $this->expectException(\InvalidArgumentException::class); - sets the expected exception class.
3. throw new \InvalidArgumentException('Exception message'); - throws the exception.

Helpful links

• PHPUnit Documentation - Assertions

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