public void GivenViewModelWithNrOfEnginesAndThrustPerEngineNotZero_WhenSettingThrustPerEngineNaN_ThenEventsFired()
{
// Given
const int nrOfEngines = 4;
var random = new Random(21);
double thrustPerEngine = random.NextDouble();
var engineData = new EngineData
{
NrOfEngines = nrOfEngines,
ThrustPerEngine = thrustPerEngine
};
var viewModel = new EngineSettingsTabViewModel(engineData);
var eventArgsCollection = new List <PropertyChangedEventArgs>();
viewModel.PropertyChanged += (o, e) =>
{
eventArgsCollection.Add(e);
};
// When
viewModel.ThrustPerEngine = double.NaN;
double totalThrust = viewModel.TotalThrust;
// Then
Assert.That(totalThrust, Is.NaN);
CollectionAssert.AreEquivalent(new[]
{
"ThrustPerEngine",
"TotalThrust"
}, eventArgsCollection.Select(e => e.PropertyName));
}
public void NrOfFailedEngines_SettingNewValue_RaisesOnPropertyChangedEventAndSetsEngineDat()
{
// Setup
var engineData = new EngineData();
var viewModel = new EngineSettingsTabViewModel(engineData);
bool propertyChangedTriggered = false;
PropertyChangedEventArgs eventArgs = null;
viewModel.PropertyChanged += (o, e) =>
{
propertyChangedTriggered = true;
eventArgs = e;
};
var random = new Random(21);
int newValue = random.Next();
// Call
viewModel.NrOfFailedEngines = newValue;
// Assert
Assert.That(engineData.NrOfFailedEngines, Is.EqualTo(newValue));
Assert.That(propertyChangedTriggered, Is.True);
Assert.That(eventArgs.PropertyName, Is.EqualTo(nameof(EngineSettingsTabViewModel.NrOfFailedEngines)));
}
public void GivenViewModelWithNrOfEnginesAndThrustPerEngineNotZero_WhenSettingSameThrustPerEngine_ThenNoEventsFired(double tolerance)
{
// Given
const int nrOfEngines = 4;
var random = new Random(21);
double thrustPerEngine = random.NextDouble();
var engineData = new EngineData
{
NrOfEngines = nrOfEngines,
ThrustPerEngine = thrustPerEngine
};
var viewModel = new EngineSettingsTabViewModel(engineData);
var eventArgsCollection = new List <PropertyChangedEventArgs>();
viewModel.PropertyChanged += (o, e) =>
{
eventArgsCollection.Add(e);
};
// When
viewModel.ThrustPerEngine = thrustPerEngine + tolerance;
// Then
Assert.That(engineData.ThrustPerEngine, Is.EqualTo(thrustPerEngine));
Assert.That(eventArgsCollection, Is.Empty);
}
public void GivenViewModelWithThrustPerEngineNotZero_WhenNrOfEnginesSet_ThenNotifyPropertyChangedEventsFiredAndTotalThrustUpdated()
{
// Given
var random = new Random(21);
double thrustPerEngine = random.NextDouble();
var engineData = new EngineData
{
ThrustPerEngine = thrustPerEngine
};
var viewModel = new EngineSettingsTabViewModel(engineData);
var eventArgsCollection = new List <PropertyChangedEventArgs>();
viewModel.PropertyChanged += (o, e) =>
{
eventArgsCollection.Add(e);
};
const int nrOfEngines = 4;
// When
viewModel.NrOfEngines = nrOfEngines;
double totalThrust = viewModel.TotalThrust;
int maximumNrOfFailedEngines = viewModel.MaximumNrOfFailedEngines;
// Then
Assert.That(maximumNrOfFailedEngines, Is.EqualTo(nrOfEngines - 1));
Assert.That(totalThrust, Is.EqualTo(nrOfEngines * thrustPerEngine).Within(1e-5));
CollectionAssert.AreEquivalent(new[]
{
"NrOfEngines",
"TotalThrust",
"MaximumNrOfFailedEngines"
}, eventArgsCollection.Select(e => e.PropertyName));
}
public void GivenViewModelWithNrOfEnginesNotZero_WhenThrustPerEngineSet_ThenNotifyPropertyChangedEventsFiredAndTotalThrustUpdated()
{
// Given
const int nrOfEngines = 4;
var engineData = new EngineData
{
NrOfEngines = nrOfEngines
};
var viewModel = new EngineSettingsTabViewModel(engineData);
var eventArgsCollection = new List <PropertyChangedEventArgs>();
viewModel.PropertyChanged += (o, e) =>
{
eventArgsCollection.Add(e);
};
var random = new Random(21);
double thrustPerEngine = random.NextDouble();
// When
viewModel.ThrustPerEngine = thrustPerEngine;
double totalThrust = viewModel.TotalThrust;
// Then
double expectedTotalThrust = nrOfEngines * thrustPerEngine;
Assert.That(totalThrust, Is.EqualTo(expectedTotalThrust).Within(1e-5));
CollectionAssert.AreEquivalent(new[]
{
"ThrustPerEngine",
"TotalThrust"
}, eventArgsCollection.Select(e => e.PropertyName));
}
private static void AssertEngineData(EngineSettingsTabViewModel expected,
EngineData actual)
{
Assert.That(actual.ThrustPerEngine, Is.EqualTo(expected.ThrustPerEngine));
Assert.That(actual.NrOfEngines, Is.EqualTo(expected.NrOfEngines));
Assert.That(actual.NrOfFailedEngines, Is.EqualTo(expected.NrOfFailedEngines));
}
private static void SetEngineData(EngineSettingsTabViewModel viewModel, int seed)
{
var random = new Random(seed);
viewModel.ThrustPerEngine = random.Next();
viewModel.NrOfEngines = random.Next();
viewModel.NrOfFailedEngines = viewModel.NrOfEngines - 1;
// Precondition
var defaultSettings = new EngineData();
Assert.That(viewModel.NrOfEngines, Is.Not.EqualTo(defaultSettings.NrOfEngines));
Assert.That(viewModel.NrOfFailedEngines, Is.Not.EqualTo(defaultSettings.NrOfFailedEngines));
}
public void ThrustPerEngine_SettingNewValue_SetsEngineData()
{
// Setup
var engineData = new EngineData();
var viewModel = new EngineSettingsTabViewModel(engineData);
var random = new Random(21);
double newValue = random.NextDouble();
// Call
viewModel.ThrustPerEngine = newValue;
// Assert
Assert.That(engineData.ThrustPerEngine, Is.EqualTo(newValue));
}
public void NrOfEngines_SettingNewValue_SetsEngineData()
{
// Setup
var engineData = new EngineData();
var viewModel = new EngineSettingsTabViewModel(engineData);
var random = new Random(21);
int newValue = random.Next();
// Call
viewModel.NrOfEngines = newValue;
// Assert
Assert.That(engineData.NrOfEngines, Is.EqualTo(newValue));
}
public static void Constructor_ExpectedValues()
{
// Setup
var engineData = new EngineData();
// Call
var viewModel = new EngineSettingsTabViewModel(engineData);
// Assert
Assert.That(viewModel, Is.InstanceOf <ViewModelBase>());
Assert.That(viewModel, Is.InstanceOf <ITabViewModel>());
Assert.That(viewModel.TabName, Is.EqualTo("Engine data"));
Assert.That(viewModel.ThrustPerEngine, Is.EqualTo(engineData.ThrustPerEngine));
Assert.That(viewModel.NrOfEngines, Is.EqualTo(engineData.NrOfEngines));
Assert.That(viewModel.NrOfFailedEngines, Is.EqualTo(engineData.NrOfFailedEngines));
}
public void GivenViewModelWithMaximumNrOfFailedEngines_WhenNrOfEnginesDecreasesBelowMaximumAllowed_ThenMaximumNrOfEnginesCappedAndEventsFired()
{
// Given
const int nrOfEngines = 4;
var engineData = new EngineData
{
NrOfEngines = nrOfEngines,
NrOfFailedEngines = nrOfEngines - 1
};
var viewModel = new EngineSettingsTabViewModel(engineData);
var eventArgsCollection = new List <PropertyChangedEventArgs>();
viewModel.PropertyChanged += (o, e) =>
{
eventArgsCollection.Add(e);
};
// When
const int updatedNrOfEngines = 3;
viewModel.NrOfEngines = updatedNrOfEngines;
int updatedNrOfFailedEngines = viewModel.NrOfFailedEngines;
// Then
Assert.That(engineData.NrOfEngines, Is.EqualTo(updatedNrOfEngines));
const int expectedNrOfFailedEngines = updatedNrOfEngines - 1;
Assert.That(engineData.NrOfFailedEngines, Is.EqualTo(expectedNrOfFailedEngines));
Assert.That(updatedNrOfFailedEngines, Is.EqualTo(expectedNrOfFailedEngines));
CollectionAssert.AreEquivalent(new[]
{
"NrOfEngines",
"TotalThrust",
"MaximumNrOfFailedEngines",
"NrOfFailedEngines"
}, eventArgsCollection.Select(e => e.PropertyName));
}