Lithium API

				public function testUpdateWithSingleKey() {
		$doc = new Document(array(
			'model' => 'lithium\tests\mocks\data\model\MockDocumentPost',
		));
		$expected = 'id';
		$result = MockDocumentPost::meta('key');
		$this->assertEqual($expected, $result);

		$doc->id = 3;
		$this->assertFalse($doc->exists());

		$doc->update(12);
		$this->assertTrue($doc->exists());

		$expected = 12;
		$result = $doc->id;
		$this->assertEqual($expected, $result);
	}