public void ChangePropertyAndNotify_ChangeHasAffectedObjects_AffectedObjectsNotified()
{
// Setup
SetObservablePropertyValueDelegate setAction = () => {};
var mocks = new MockRepository();
var observableA = mocks.StrictMock <IObservable>();
observableA.Expect(o => o.NotifyObservers());
var observableB = mocks.StrictMock <IObservable>();
observableB.Expect(o => o.NotifyObservers());
IObservable[] affectedObjects =
{
observableA,
observableB
};
var handler = mocks.StrictMock <IObservablePropertyChangeHandler>();
handler.Expect(h => h.SetPropertyValueAfterConfirmation(setAction)).Return(affectedObjects);
mocks.ReplayAll();
// Call
PropertyChangeHelper.ChangePropertyAndNotify(setAction, handler);
// Assert
mocks.VerifyAll();
}
public void ChangePropertyAndNotify_WithoutChangeHandler_ThrowsArgumentNullException()
{
// Call
TestDelegate test = () => PropertyChangeHelper.ChangePropertyAndNotify(() => {}, null);
// Assert
var exception = Assert.Throws <ArgumentNullException>(test);
Assert.AreEqual("changeHandler", exception.ParamName);
}
public void When_PropertyChanged_Suppressed_Then_NotifyPropertyChanged_Does_Not_Fire_PropertyChanged()
{
// Arrange
var eventCount = 0;
var sut = new PropertyChangeHelper(this);
sut.PropertyChanged += (sender, args) => ++eventCount;
// Act
using (sut.SuppressPropertyChanged())
sut.NotifyPropertyChanged("Age", "UserData-1");
// Assert
Assert.AreEqual(0, eventCount);
}
public void When_NotifyPropertyValueChanged_Then_Fires_PropertyChange_On_Event_With_Correct_Values()
{
// Arrange
var propertyChanges = new List<PropertyChangedEventArgsEx>();
var sut = new PropertyChangeHelper(this);
sut.PropertyChanged += (sender, args) => propertyChanges.Add((PropertyChangedEventArgsEx) args);
var expectedPropertyChange = new PropertyChangedEventArgsEx("Age", "UserData-2");
// Act
sut.NotifyPropertyChanged("Age", "UserData-2");
// Assert
Assert.AreEqual(1, propertyChanges.Count);
Assert.AreEqual(expectedPropertyChange, propertyChanges[0]);
}
public void When_SetPropertyValue_New_Value_Then_Fires_PropertyChanged()
{
// Arrange
var propertyChanges = new List<PropertyChangedEventArgsEx>();
var sut = new PropertyChangeHelper(this);
sut.PropertyChanged += (sender, args) => propertyChanges.Add((PropertyChangedEventArgsEx) args);
var age = 10;
var expectedPropertyChange = new PropertyChangedEventArgsEx("Age", "UserData-1");
// Act
sut.SetPropertyValue(ref age, 17, "Age", "UserData-1");
// Assert
Assert.AreEqual(1, propertyChanges.Count);
Assert.AreEqual(expectedPropertyChange, propertyChanges[0]);
}
public void ChangePropertyAndNotify_ChangeHasNoAffectedObjects_HandlerUsedForSetAction()
{
// Setup
SetObservablePropertyValueDelegate setAction = () => {};
var mocks = new MockRepository();
var handler = mocks.StrictMock <IObservablePropertyChangeHandler>();
handler.Expect(h => h.SetPropertyValueAfterConfirmation(setAction)).Return(Enumerable.Empty <IObservable>());
mocks.ReplayAll();
// Call
PropertyChangeHelper.ChangePropertyAndNotify(setAction, handler);
// Assert
mocks.VerifyAll();
}
public void ChangePropertyAndNotify_WithoutPropertySetDelegate_ThrowsArgumentNullException()
{
// Setup
var mocks = new MockRepository();
var handler = mocks.Stub <IObservablePropertyChangeHandler>();
mocks.ReplayAll();
// Call
TestDelegate test = () => PropertyChangeHelper.ChangePropertyAndNotify(null, handler);
// Assert
var exception = Assert.Throws <ArgumentNullException>(test);
Assert.AreEqual("setPropertyDelegate", exception.ParamName);
mocks.VerifyAll();
}
public void When_SetPropertyValue_Same_Value_Then_Does_Not_Fire_PropertyChanged()
{
// Arrange
var eventCount = 0;
var sut = new PropertyChangeHelper(this);
sut.PropertyChanged += (sender, args) => ++eventCount;
;
var age = 10;
// Act
sut.SetPropertyValue(ref age, 10, "Age", "UserData-1");
// Assert
Assert.AreEqual(0, eventCount);
}
/// <summary>
/// Handles the property change.
/// </summary>
/// <param name="setPropertyDelegate">The property change action.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="setPropertyDelegate"/>
/// is <c>null</c>.</exception>
protected void HandleChangeProperty(SetObservablePropertyValueDelegate setPropertyDelegate)
{
PropertyChangeHelper.ChangePropertyAndNotify(setPropertyDelegate, propertyChangeHandler);
}
