public void Implement()
{
Console.WriteLine("\nLearning Observer Pattern\n");
WeatherData weatherData = new WeatherData(temperature: 40, pressure: 120, humidity: 20);
Console.WriteLine(weatherData.ToString());
IObserver sObserver = new StatisticsDisplay();
weatherData.RegisterObserver(sObserver);
IObserver fObserver = new ForecastDisplay();
weatherData.RegisterObserver(fObserver);
IObserver gObserver = new GeneralDisplay();
weatherData.RegisterObserver(gObserver);
weatherData.NotifyObserver();
sObserver.Display();
fObserver.Display();
gObserver.Display();
weatherData.DataChanged(temperature: 20, pressure: 80, humidity: 10); //Just a dummy method which updates the weather data
Console.WriteLine($"\nWeather changed {weatherData.ToString()}");
sObserver.Display();
fObserver.Display();
gObserver.Display();
Console.WriteLine("\nObserver Removed: General Display");
weatherData.RemoveObserver(gObserver);
weatherData.DataChanged(temperature: -20, pressure: 20, humidity: 0); //Just a dummy method which updates the weather data
sObserver.Display();
fObserver.Display();
gObserver.Display();
}
public void weather_data_updates_statistics_correctly()
{
var wd = new WeatherData();
var display = new StatisticsDisplay(wd);
wd.SetMeasurements(20, 15, 73);
Assert.AreEqual("Avg/Max/Min Temperature: 20/20/20", display.Display());
wd.SetMeasurements(40, 15, 73);
Assert.AreEqual("Avg/Max/Min Temperature: 30/40/20", display.Display());
wd.SetMeasurements(0, 15, 73);
Assert.AreEqual("Avg/Max/Min Temperature: 20/40/0", display.Display());
}
private static void TestObserverPattern()
{
WeatherData weatherData = new WeatherData();
TemperatureReporter temperatureReporter = new TemperatureReporter();
CurrentConditionsDisplay currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
CurrentTemperatureDisplay currentTemperatureDisplay = new CurrentTemperatureDisplay(temperatureReporter);
Temperature t = new Temperature {
Temp = 80
};
temperatureReporter.TemperatureChanged(t);
t.Temp = 82;
temperatureReporter.TemperatureChanged(t);
Console.WriteLine(currentTemperatureDisplay.Display());
t.Temp = 78;
temperatureReporter.TemperatureChanged(t);
Console.WriteLine(currentTemperatureDisplay.Display());
weatherData.SetMeasurements(80, 65, 30.4);
weatherData.SetMeasurements(82, 70, 29.2);
weatherData.SetMeasurements(78, 90, 29.2);
Console.WriteLine(currentConditionsDisplay.Display());
Console.WriteLine(statisticsDisplay.Display());
Console.WriteLine(forecastDisplay.Display());
Console.WriteLine(heatIndexDisplay.Display());
}
public void WhenCreateStatisticsDisplayAndCallSetMeasurementsMethodOnceExpectDisplayMethodReturnStatisticsMessageAvg80Max80Min80()
{
var weatherData = new WeatherData();
var statisticsDisplay = new StatisticsDisplay(weatherData);
weatherData.SetMeasurements(80, 50, 80);
Assert.AreEqual("Avg/Max/Min temperature = 80 / 80 / 80", statisticsDisplay.Display());
}
public void weather_data_updates_observers_correctly()
{
var wd = new WeatherData();
var conditions = new CurrentConditionsDisplay(wd);
var heat = new HeatIndexDisplay(wd);
var stats = new StatisticsDisplay(wd);
var forecast = new ForecastDisplay(wd);
wd.SetMeasurements(80, 65, 30.4f);
Assert.AreEqual("Current Conditions: 80 celsius and humidity 65", conditions.Display());
Assert.AreEqual("Heat index is 82.95535", heat.Display());
Assert.AreEqual("Avg/Max/Min Temperature: 80/80/80", stats.Display());
Assert.AreEqual("Improving weather on the way!", forecast.Display());
wd.SetMeasurements(78, 90, 29.2f);
Assert.AreEqual("Current Conditions: 78 celsius and humidity 90", conditions.Display());
Assert.AreEqual("Heat index is 83.64967", heat.Display());
Assert.AreEqual("Avg/Max/Min Temperature: 79/80/78", stats.Display());
Assert.AreEqual("Weather is getting bad!", forecast.Display());
}
public void StatisticsDisplay_ShouldDisplay_WhenMeasurementsChanged()
{
//Act
_weatherData.SetMeasurements(80, 63, 31.2f);
_weatherData.SetMeasurements(81, 63, 29.92f);
_weatherData.SetMeasurements(84, 63, 29.92f);
var display = _statisticsDisplay.Display();
//Assert
display.Should().Be("Avg/Max/Min temperature = 81.67F/84F/80F");
_statisticsDisplay.NumberOfReadings.Should().Be(3);
}
public void Test_WeatherStationHeatIndex()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
var result = statisticsDisplay.Display();
}
public void WeatherStationTest()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
currentDisplay.Display();
statisticsDisplay.Display();
forecastDisplay.Display();
}