public void Store_ItShouldCallReducersReduceMethodWithGivenAction()
{
// given
var reducer = new Mock <IReducer <string> >();
var action = new ChangeStringAction(InitialState);
reducer
.Setup(_ => _.Reduce(InitialState, action))
.Returns(NewState);
IStore <string> store = new Store <string>(InitialState, reducer.Object);
// when
store.Dispatch(action);
// then
reducer.VerifyAll();
}
public void Store_Select_SubstoresShouldOnlyReactToChangesOfSubstate()
{
// STORY
// Subscribed actions are called at least once - for the initial state.
// After dispatch (WHEN), the reducer only changes the Name property of
// the CompositeState. Therefore, stringSubStore subscribers should be
// called twice while dateTimeSubStore subscribers only once.
// given
var dt = DateTime.Now;
var state = new CompositeState("john", dt);
var updateNameAction = new ChangeStringAction("mike");
var reducer = new Mock <IReducer <CompositeState> >();
reducer
.Setup(_ => _.Reduce(state, updateNameAction))
.Returns((CompositeState oldState, ChangeStringAction action) =>
{
oldState.Name = action.NewString;
return(oldState);
});
IStore <CompositeState> store = new Store <CompositeState>(state, reducer.Object);
var numCallsStringSubStore = 0;
var numCallsDateTimeSubStore = 0;
IStore <string> stringSubStore = store.Select(_ => _.Name);
IStore <DateTime> dateTimeSubStore = store.Select(_ => _.UpdatedAt);
stringSubStore.Subscribe(_ =>
{
numCallsStringSubStore++;
});
dateTimeSubStore.Subscribe(_ =>
{
numCallsDateTimeSubStore++;
});
// when
store.Dispatch(updateNameAction);
// then
Assert.AreEqual(2, numCallsStringSubStore);
Assert.AreEqual(1, numCallsDateTimeSubStore);
}
public void Store_ItShouldNotifySubscribersWhenReducerReturnsUpdatedState()
{
// given
var reducer = new Mock <IReducer <string> >();
var action = new ChangeStringAction(InitialState);
var newState = "";
reducer
.Setup(_ => _.Reduce(InitialState, action))
.Returns(NewState);
IStore <string> store = new Store <string>(InitialState, reducer.Object);
// when
store.Subscribe(_ => newState = _);
store.Dispatch(action);
// then
Assert.AreEqual(NewState, newState);
reducer.VerifyAll();
}