public void ValueUpdatingTest()
{
// prepare
var observableValue = new MutableObservableValue <int>(1);
var observer1 = new Observer <int>();
using var subscription1 = observableValue.Subscribe(observer1);
// check initial notification
Assert.IsTrue(observer1.IsOnNextCalled, "First notification should be sent.");
Assert.AreEqual(1, observer1.LatestValue, "Value of initial notification is unexpected.");
// update different value
observer1.IsOnNextCalled = false;
observableValue.Update(2);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.AreEqual(2, observer1.LatestValue, "Value of notification is unexpected.");
// update same value
observer1.IsOnNextCalled = false;
observableValue.Update(2);
Assert.IsFalse(observer1.IsOnNextCalled, "Notification should not be sent.");
// update value nestedly
var observer2 = new Observer <int>(() =>
{
observableValue.Update(123);
});
var observer3 = new Observer <int>();
using var subscription2 = observableValue.Subscribe(observer2);
using var subscription3 = observableValue.Subscribe(observer3);
observer2.IsOnNextCalled = false;
observer3.IsOnNextCalled = false;
observableValue.Update(3);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsTrue(observer2.IsOnNextCalled, "Notification should be sent.");
Assert.IsTrue(observer3.IsOnNextCalled, "Notification should be sent.");
Assert.AreEqual(123, observer1.LatestValue, "Value of notification is unexpected.");
Assert.AreEqual(123, observer2.LatestValue, "Value of notification is unexpected.");
Assert.AreEqual(123, observer3.LatestValue, "Value of notification is unexpected.");
}
public void ObserverSubscriptionTest()
{
// prepare
var observableValue = new MutableObservableValue <int>(1);
var observer1 = new Observer <int>();
var observer2 = new Observer <int>();
var subscription1 = observableValue.Subscribe(observer1);
var subscription2 = (IDisposable?)observableValue.Subscribe(observer2);
// check initial notification
Assert.IsTrue(observer1.IsOnNextCalled, "First notification should be sent.");
Assert.IsTrue(observer2.IsOnNextCalled, "First notification should be sent.");
Assert.AreEqual(1, observer1.LatestValue, "Value of initial notification is unexpected.");
Assert.AreEqual(1, observer2.LatestValue, "Value of initial notification is unexpected.");
// update value
observer1.IsOnNextCalled = false;
observer2.IsOnNextCalled = false;
observableValue.Update(2);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsTrue(observer2.IsOnNextCalled, "Notification should be sent.");
Assert.AreEqual(2, observer1.LatestValue, "Value of notification is unexpected.");
Assert.AreEqual(2, observer2.LatestValue, "Value of notification is unexpected.");
// unscribe
subscription2 = subscription2.DisposeAndReturnNull();
observer1.IsOnNextCalled = false;
observer2.IsOnNextCalled = false;
observableValue.Update(3);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsFalse(observer2.IsOnNextCalled, "Notification should not be sent.");
Assert.AreEqual(3, observer1.LatestValue, "Value of notification is unexpected.");
// subscribe when updating value
var isFirstOnNext3 = true;
var observer3 = new Observer <int>(() =>
{
if (isFirstOnNext3)
{
isFirstOnNext3 = false;
}
else if (subscription2 == null)
{
subscription2 = observableValue.Subscribe(observer2);
}
else
{
subscription2 = subscription2.DisposeAndReturnNull();
}
});
var subscription3 = observableValue.Subscribe(observer3);
observer1.IsOnNextCalled = false;
observer3.IsOnNextCalled = false;
Assert.IsFalse(observer2.IsOnNextCalled, "Notification should not be sent.");
observableValue.Update(0);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsTrue(observer2.IsOnNextCalled, "Notification should be sent.");
Assert.IsTrue(observer3.IsOnNextCalled, "Notification should be sent.");
// unsubscribe when updating value
observer1.IsOnNextCalled = false;
observer2.IsOnNextCalled = false;
observer3.IsOnNextCalled = false;
observableValue.Update(1);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsFalse(observer2.IsOnNextCalled, "Notification should not be sent.");
Assert.IsTrue(observer3.IsOnNextCalled, "Notification should be sent.");
// subscribe
subscription3.Dispose();
var observer4 = new Observer <int>();
var subscription4 = observableValue.Subscribe(observer4);
observer1.IsOnNextCalled = false;
observer2.IsOnNextCalled = false;
observer3.IsOnNextCalled = false;
observer4.IsOnNextCalled = false;
observableValue.Update(2);
Assert.IsTrue(observer1.IsOnNextCalled, "Notification should be sent.");
Assert.IsFalse(observer2.IsOnNextCalled, "Notification should not be sent.");
Assert.IsFalse(observer3.IsOnNextCalled, "Notification should not be sent.");
Assert.IsTrue(observer4.IsOnNextCalled, "Notification should be sent.");
// complete
subscription1.Dispose();
}