public async Task TestWithoutInitialValue()
{
var updatable = new BackgroundUpdatable <string>(
TimeSpan.FromMinutes(1),
() => Task.FromResult("updated value"));
updatable.Value().ShouldBe("updated value");
await Task.Delay(10);
updatable.Value().ShouldBe("updated value");
}
public async Task TestInitializesOnlyOnce()
{
var spy = Spy.On(() => Delay("updated value"));
var updatable = new BackgroundUpdatable <string>(
TimeSpan.FromMinutes(10),
spy.Func);
var results = await Simultaneously.Run(5, updatable.Value);
results.ShouldAllBe(x => x == "updated value");
spy.Called.ShouldBe(1);
}
public async Task TestUpdatesOnlyOnce()
{
var spy = Spy.On(() => Delay("updated value"));
var updatable = new BackgroundUpdatable <string>(
"initial value",
TimeSpan.FromMilliseconds(100),
spy.Func);
updatable.Value();
await Task.Delay(120);
await Simultaneously.Run(50, updatable.Value);
spy.Called.ShouldBe(1);
}
public async Task TestUpdatesAfterDelay()
{
var updatable = new BackgroundUpdatable <string>(
"initial value",
TimeSpan.FromMilliseconds(30),
() => Task.FromResult("updated value"));
updatable.Value().ShouldBe("initial value");
await Task.Delay(50);
updatable.Value().ShouldBe("initial value");
await Task.Delay(10);
updatable.Value().ShouldBe("updated value");
}
public async Task TestTriggersEventsWhenUpdateFailsTests()
{
var backgroundUpdateFailed = Substitute.For <BackgroundUpdateFailedHandler>();
var updatable = new BackgroundUpdatable <string>(
"initial value",
TimeSpan.FromMilliseconds(30),
() => Task.FromException <string>(new Exception("oh noes")));
updatable.BackgroundUpdateFailed += backgroundUpdateFailed;
updatable.Value().ShouldBe("initial value");
await Task.Delay(50);
updatable.Value().ShouldBe("initial value");
await Task.Delay(50);
backgroundUpdateFailed.Received(1)(Arg.Is <Exception>(e => e.Message == "oh noes"));
}
public async Task TestTriggersEventsDuringUpdateTests()
{
var backgroundUpdateStarted = Substitute.For <BackgroundUpdateStartedHandler>();
var backgroundUpdateSucceeded = Substitute.For <BackgroundUpdateSucceededHandler>();
var updatable = new BackgroundUpdatable <string>(
"initial value",
TimeSpan.FromMilliseconds(30),
() => Task.FromResult("updated value"));
updatable.BackgroundUpdateStarted += backgroundUpdateStarted;
updatable.BackgroundUpdateSucceeded += backgroundUpdateSucceeded;
updatable.Value().ShouldBe("initial value");
await Task.Delay(50);
updatable.Value().ShouldBe("initial value");
await Task.Delay(50);
backgroundUpdateStarted.Received(1)();
backgroundUpdateSucceeded.Received(1)("updated value");
}
