public function testKeys()
{
$fieldDescription1 = $this->getFieldDescriptionMock('fooName1', 'fooLabel1');
$fieldDescription2 = $this->getFieldDescriptionMock('fooName2', 'fooLabel2');
$this->datagridMapper->add($fieldDescription1, null, array('field_name' => 'fooFilterName1'));
$this->datagridMapper->add($fieldDescription2, null, array('field_name' => 'fooFilterName2'));
$this->assertSame(array('fooName1', 'fooName2'), $this->datagridMapper->keys());
}
