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());
}
public function testDisable()
{
$subject = new WeatherData();
$display = new ThirdPartyDisplay($subject);
$expected = "ThirdPartyDisplay: some data for temperature(0), pressure(0) and humidity(0).";
$this->assertEquals($expected, $display->display());
$subject->setMeasurements(80, 65, 35);
$expected = "ThirdPartyDisplay: some data for temperature(80), pressure(65) and humidity(35).";
$this->assertEquals($expected, $display->display());
$display->disable();
$subject->setMeasurements(10, 10, 10);
$expected = "ThirdPartyDisplay: some data for temperature(80), pressure(65) and humidity(35).";
$this->assertEquals($expected, $display->display());
}