public void GetValue_CallingGetValueWithinValueInitializer_DoesNotCallValueInitializerAgain()
{
PropertyStub <object> property = null;
Func <IBehaviorContext, object> provideValueFunction = ctx => {
return(new Object());
};
var behavior = new TestBehavior(provideValueFunction);
var valueInitializerWasAlreadyInvoked = false;
Action <IBehaviorContext> initializeValueAction = ctx => {
Assert.IsFalse(valueInitializerWasAlreadyInvoked);
valueInitializerWasAlreadyInvoked = true;
property.Behaviors.GetValueNext <object>(ctx);
};
property = PropertyStub
.WithBehaviors(behavior, new TestValueInitializerBehavior(initializeValueAction))
.Build();
var context = ViewModelStub
.WithProperties(property)
.BuildContext();
behavior.GetValue(context);
Assert.IsTrue(valueInitializerWasAlreadyInvoked);
}
public void GetValue_CallingGetValueWithinProvideValue_ThrowsException()
{
PropertyStub <object> property = null;
var provideValueWasAlreadyCalled = false;
Func <IBehaviorContext, object> provideValueFunction = ctx => {
Assert.IsFalse(provideValueWasAlreadyCalled);
provideValueWasAlreadyCalled = true;
property.Behaviors.GetValueNext <object>(ctx);
return(new Object());
};
var behavior = new TestBehavior(provideValueFunction);
property = PropertyStub
.WithBehaviors(behavior)
.Build();
var context = ViewModelStub
.WithProperties(property)
.BuildContext();
AssertHelper.Throws <InvalidOperationException>(() =>
behavior.GetValue(context)
).WithMessage(EViewModels.ValueAccessedWithinProvideValue);
Assert.IsTrue(provideValueWasAlreadyCalled);
}
