public void CanObserveStateOfMultipleEventViews()
{
// Arrange
var eventSubject = new Subject <SimpleEvent>();
var totalCostCartEventView = new TotalCostCartEventView(eventSubject.AsObservable());
var ordersCartEventView = new OrdersCartEventView(eventSubject.AsObservable());
// Act
TotalCostCartState lastTotalCostCartState = null;
OrdersCartState lastOrdersCartState = null;
totalCostCartEventView.ObserveState()
.Subscribe(state =>
{
lastTotalCostCartState = state;
});
ordersCartEventView.ObserveState()
.Subscribe(state =>
{
lastOrdersCartState = state;
});
eventSubject.OnNext(new SimpleEvent
{
EventName = nameof(AddItemInCartCommand),
Data = new AddItemInCartCommand
{
ItemName = "Book",
UnitCost = 45
}
});
eventSubject.OnNext(new SimpleEvent
{
EventName = nameof(AddItemInCartCommand),
Data = new AddItemInCartCommand
{
ItemName = "Book",
UnitCost = 20
}
});
// Assert
Assert.NotNull(lastTotalCostCartState);
Assert.Equal(65, lastTotalCostCartState.TotalCost);
Assert.NotNull(lastOrdersCartState);
Assert.Equal(2, lastOrdersCartState.NumberOfItems);
Assert.Single(lastOrdersCartState.Items);
Assert.True(lastOrdersCartState.Items.ContainsKey("Book"));
Assert.Equal(2, lastOrdersCartState.Items["Book"]);
}
public void CanObserveStatePartially()
{
// Arrange
var eventSubject = new Subject <SimpleEvent>();
var ordersCartEventView = new OrdersCartEventView(eventSubject.AsObservable());
// Act
int lastNumberOfItems = 0;
ordersCartEventView.ObserveState(state => state.NumberOfItems)
.Subscribe(numberOfItems =>
{
lastNumberOfItems = numberOfItems;
});
eventSubject.OnNext(new SimpleEvent
{
EventName = nameof(AddItemInCartCommand),
Data = new AddItemInCartCommand
{
ItemName = "Book",
UnitCost = 45
}
});
eventSubject.OnNext(new SimpleEvent
{
EventName = nameof(AddItemInCartCommand),
Data = new AddItemInCartCommand
{
ItemName = "Book",
UnitCost = 20,
NumberOfUnits = 2
}
});
// Assert
Assert.Equal(3, lastNumberOfItems);
}
