public function testWithinMiles()
{
$query = new Query("TestObject");
$query->withinMiles('location', new GeoPoint(39.9, 116.4), 0.5);
$out = $query->encode();
$expect = json_encode(array('location' => array('$nearSphere' => array('__type' => 'GeoPoint', 'latitude' => 39.9, 'longitude' => 116.4), '$maxDistanceInMiles' => 0.5)));
$this->assertEquals($expect, $out['where']);
}