public function testFieldMappings($class)
{
$this->assertEquals(4, count($class->fieldMappings));
$this->assertTrue(isset($class->fieldMappings['id']));
$this->assertTrue(isset($class->fieldMappings['name']));
$this->assertTrue(isset($class->fieldMappings['comments']));
$this->assertTrue(isset($class->fieldMappings['roles']));
return $class;
}