Error Identifier: phpunit.assertNull

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

use PHPUnit\Framework\TestCase;

class MyTest extends TestCase
{
	public function testFoo(): void
	{
		$value = null;
		$this->assertSame(null, $value);
	}
}

Why is it reported? #

This rule is part of phpstan-phpunit.

When asserting that a value is null, assertNull() should be used instead of assertSame(null, $value). The dedicated method is more readable and provides clearer failure messages.

How to fix it #

Replace assertSame(null, ...) with assertNull():

 <?php declare(strict_types = 1);
 
 use PHPUnit\Framework\TestCase;

 class MyTest extends TestCase
 {
 	public function testFoo(): void
 	{
 		$value = null;
-		$this->assertSame(null, $value);
+		$this->assertNull($value);
 	}
 }

How to ignore this error #

You can use the identifier phpunit.assertNull to ignore this error using a comment:

// @phpstan-ignore phpunit.assertNull
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: phpunit.assertNull

Rules that report this error #

PHPStan\Rules\PHPUnit\AssertSameNullExpectedRule [1] phpstan/phpstan-phpunit

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