VGirol / JsonApi-Assert-Laravel

src/macro/Response/noContent.php

<?php

use Illuminate\Testing\TestResponse;
use VGirol\JsonApiAssert\Laravel\Assert;

TestResponse::macro(
    'assertJsonApiNoContent',
    /**
     * @return void
     * @throws \PHPUnit\Framework\AssertionFailedError
     */
    function () {
        Assert::assertIsNoContentResponse($this);

The variable $this seems to be never defined.

    }
);