public function testRemoveObserver()
{
$weatherData = new WeatherData();
$curCondDisplay = new CurrentConditionsDisplay($weatherData);
// before any update from weatherData
$expected = "CurrentConditionsDisplay: 0 F degrees and 0% humidity.";
$this->assertEquals($expected, $curCondDisplay->display());
// remove currentConditionsDisplay from Observers
$weatherData->removeObserver($curCondDisplay);
// change weatherData, so current conditions should change as well
$weatherData->setMeasurements(5, 5, 5);
// same message observer was not notified
$this->assertEquals($expected, $curCondDisplay->display());
}
