assertInstanceOf doesn't refine type when used with generic class-string

[Jean85]

I want to implement this method in my testcase:

class BaseTestCase extends \PHPUnit\Framework\TestCase
{
    /**
     * @template T of object
     *
     * @param class-string<T> $class
     *
     * @return T
     */
    protected function fetch(string $class): object
    {
        $message = $this->fetch(); // returns object of unknown class

        $this->assertInstanceOf($class, $message, 'Message is not of the expected type');

        return $firstMessage;
    }
}

but this doesn't seem to work.

[Jean85]

I hope to have recreated a correct regression test for this in #186

[ondrejmirtes]

Fixed https://github.com/phpstan/phpstan-phpunit/pull/186

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