private function getFixturesConfig($fixtures)
    {
        $config = [];

        foreach ($fixtures as $fixture) {
            $isNamespaced = (strpos($fixture, '\\') !== false);
            // replace linux' path slashes to namespace backslashes, in case if $fixture is non-namespaced relative path
            $fixture = str_replace('/', '\\', $fixture);
            $fullClassName = $isNamespaced ? $fixture : $this->namespace . '\\' . $fixture;

            if (class_exists($fullClassName)) {
                $config[] = $fullClassName;
            } elseif (class_exists($fullClassName . 'Fixture')) {
                $config[] = $fullClassName . 'Fixture';
            }
        }

        return $config;
    }