public function testChildMapping($class)
{
$this->assertTrue(isset($class->childMappings));
$this->assertCount(2, $class->childMappings);
$this->assertTrue(isset($class->mappings['child1']));
$this->assertEquals('first', $class->mappings['child1']['nodeName']);
$this->assertTrue(isset($class->mappings['child2']));
$this->assertEquals('second', $class->mappings['child2']['nodeName']);
}