function testTrackByReference() { $result = Postmaster_Tracking::track('1ZW470V80310800043'); $this->assertTrue($result instanceof Postmaster_Tracking); $resultArray = $result->__toArray(); $this->assertArrayHasKey('status', $resultArray); $this->assertArrayHasKey('history', $resultArray); $this->assertNotEmpty($result->history); $this->assertTrue($result->history[0] instanceof Postmaster_TrackingHistory); }