Tobscure\JsonApi\Parameters::getFields PHP Method

    public function getFields()
    {
        $fields = $this->getInput('fields');
        if (!is_array($fields)) {
            return [];
        }
        return array_map(function ($fields) {
            return explode(',', $fields);
        }, $fields);
    }

 public function testGetFieldsReturnsEmptyArray()
 {
     $parameters = new Parameters([]);
     $this->assertEquals([], $parameters->getFields());
     $parameters = new Parameters(['fields' => 'string']);
     $this->assertEquals([], $parameters->getFields());
 }