public async Task When_composed_via_state()
{
Task <object> Base(object message)
{
events.Add("base");
return(TaskResult.Unhandled);
}
Task <object> XTrait(object message)
{
events.Add("x");
return(TaskResult.Unhandled);
}
Task <object> YTrait(object message)
{
events.Add("y");
return(TaskResult.From("y"));
}
Receive[] Cast(params Receive[] args) => args;
Behavior behavior = new BehaviorTester(events)
.State(Base, trait: Cast(XTrait, YTrait))
.Initial(Base);
var result = await behavior.Receive("foo");
AssertEqual(new[] { "base", "x", "y" }, events);
Assert.AreEqual("y", result);
}
public async Task When_become_stacked()
{
Behavior behavior = new BehaviorTester(events)
.Initial("Initial")
.State("Initial")
.State("A")
.State("B")
.State("C");
await behavior.BecomeStacked("A");
await behavior.BecomeStacked("B");
await behavior.BecomeStacked("C");
Assert.That(behavior.Current.Name, Is.EqualTo("C"));
await behavior.Unbecome();
Assert.That(behavior.Current.Name, Is.EqualTo("B"));
await behavior.Unbecome();
Assert.That(behavior.Current.Name, Is.EqualTo("A"));
await behavior.Unbecome();
Assert.That(behavior.Current.Name, Is.EqualTo("Initial"));
Assert.ThrowsAsync <InvalidOperationException>(() => behavior.Unbecome());
}
public async Task When_transitioning_different_super()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial")
.State("A", super: "S")
.State("B", super: "SS")
.State("S", super: "SS")
.State("SS", super: "SSS")
.State("C", super: "SSSS")
.State("SSS")
.State("SSSS")
.Initial("A");
await behavior.Become("C");
Assert.That(behavior.Current.Name, Is.EqualTo("C"));
AssertEvents(
"OnDeactivate_A",
"OnDeactivate_S",
"OnDeactivate_SS",
"OnDeactivate_SSS",
"OnUnbecome_A",
"OnUnbecome_S",
"OnUnbecome_SS",
"OnUnbecome_SSS",
"OnBecome_SSSS",
"OnBecome_C",
"OnActivate_SSSS",
"OnActivate_C"
);
}
public async Task When_transitioning()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial")
.State("A");
behavior.Initial("Initial");
var etag = behavior.Etag;
await behavior.Become("A");
Assert.That(behavior.Current.Name, Is.EqualTo("A"));
Assert.That(behavior.Etag, Is.Not.Null);
Assert.That(behavior.Etag, Is.Not.EqualTo(etag));
var expected = new[]
{
"OnDeactivate_Initial",
"OnUnbecome_Initial",
"OnBecome_A",
"OnActivate_A"
};
AssertEvents(expected);
}
public async Task When_transitioning_within_same_super()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial")
.State("A", super: "S")
.State("B", super: "SS")
.State("S", super: "SS")
.State("SS")
.Initial("A");
await behavior.Become("B");
Assert.That(behavior.Current, Is.EqualTo("B"));
AssertEvents(
"OnTransitioning_A_B",
"OnDeactivate_A",
"OnDeactivate_S",
"OnUnbecome_A",
"OnUnbecome_S",
"OnBecome_B",
"OnActivate_B",
"OnTransitioned_B_A"
);
}
public async Task When_become_with_arguments()
{
string passedArg = null;
Task <object> Receive(object message)
{
if (message is Become <string> m)
{
passedArg = m.Argument;
}
return(TaskResult.Done);
};
Behavior behavior = new BehaviorTester(events)
.State("A", Receive)
.State("B", Receive)
.Initial("A");
await behavior.Become("B", "arg1");
Assert.That(passedArg, Is.EqualTo("arg1"));
await behavior.BecomeStacked("A", "arg2");
Assert.That(passedArg, Is.EqualTo("arg2"));
}
public void When_returns_null_task()
{
Behavior behavior = new BehaviorTester(events)
.State("A", x => null)
.Initial("A");
var exception = Assert.ThrowsAsync <InvalidOperationException>(async() => await behavior.Receive("foo"));
Assert.That(exception.Message, Is.EqualTo("Behavior returns null task on handling 'foo' message"));
}
public void When_setting_initial()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial");
behavior.Initial("Initial");
Assert.That(behavior.Current.Name, Is.EqualTo("Initial"));
Assert.That(events, Has.Count.EqualTo(0),
"OnBecome should not be called when setting initial");
}
public void When_receiving_behavior_messages_directly()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial");
behavior.Initial("Initial");
Assert.ThrowsAsync <InvalidOperationException>(() => behavior.Receive(Become.Message));
Assert.ThrowsAsync <InvalidOperationException>(() => behavior.Receive(Unbecome.Message));
Assert.That(behavior.Current.Name, Is.EqualTo("Initial"));
Assert.That(events, Has.Count.EqualTo(0));
}
public async Task When_receiving_deactivate_message_initial()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial");
behavior.Initial("Initial");
var result = await behavior.Receive(Deactivate.Message);
Assert.That(result, Is.SameAs(Done.Result));
Assert.That(behavior.Current.Name, Is.EqualTo("Initial"));
AssertEvents("OnDeactivate_Initial");
}
public async Task When_receiving_message()
{
Task <object> Receive(object x) => x is string
?Task.FromResult <object>("foo")
: Task.FromResult <object>("bar");
Behavior behavior = new BehaviorTester(events)
.State("A", Receive);
behavior.Initial("A");
Assert.That(await behavior.Receive("1"), Is.EqualTo("foo"));
Assert.That(await behavior.Receive(1), Is.EqualTo("bar"));
}
public async Task When_using_fluent_dsl()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial")
.State("S1")
.Substate("S1A")
.Substate("S1B")
.State("S2")
.Substate("S2A")
.Initial("Initial");
await behavior.Become("S1A");
Assert.That(behavior.Current.Name, Is.EqualTo("S1A"));
await behavior.Become("S1B");
Assert.That(behavior.Current.Name, Is.EqualTo("S1B"));
await behavior.Become("S2A");
Assert.That(behavior.Current.Name, Is.EqualTo("S2A"));
Debug.WriteLine(string.Join(",\r\n", events.Select(x => $"\"{x}\"")));
AssertEvents(
"OnDeactivate_Initial",
"OnUnbecome_Initial",
"OnBecome_S1",
"OnBecome_S1A",
"OnActivate_S1",
"OnActivate_S1A",
"OnDeactivate_S1A",
"OnUnbecome_S1A",
"OnBecome_S1B",
"OnActivate_S1B",
"OnDeactivate_S1B",
"OnDeactivate_S1",
"OnUnbecome_S1B",
"OnUnbecome_S1",
"OnBecome_S2",
"OnBecome_S2A",
"OnActivate_S2",
"OnActivate_S2A"
);
}
public void When_becoming_other_during_transition()
{
async Task <object> AttemptBecomeDuring <T>(Behavior b, string other, object message)
{
if (message is T)
{
await b.Become(other);
}
return(null);
}
Behavior behavior = null;
behavior = new BehaviorTester(events)
.State("A", x => AttemptBecomeDuring <Deactivate>(behavior, "C", x))
.State("B")
.State("C")
.Initial("A");
Assert.ThrowsAsync <InvalidOperationException>(async() => await behavior.Become("B"));
behavior = new BehaviorTester(events)
.State("A", x => AttemptBecomeDuring <Unbecome>(behavior, "C", x))
.State("B")
.State("C")
.Initial("A");
Assert.ThrowsAsync <InvalidOperationException>(async() => await behavior.Become("B"));
behavior = new BehaviorTester(events)
.State("A")
.State("B", x => AttemptBecomeDuring <Activate>(behavior, "C", x))
.State("C")
.Initial("A");
Assert.ThrowsAsync <InvalidOperationException>(async() => await behavior.Become("B"));
behavior = new BehaviorTester(events)
.State("A")
.State("B", x => AttemptBecomeDuring <Become>(behavior, "C", x))
.State("C")
.Initial("A");
Assert.ThrowsAsync <InvalidOperationException>(async() => await behavior.Become("B"));
}
public async Task When_transitioning()
{
Behavior behavior = new BehaviorTester(events)
.State("Initial")
.State("A");
behavior.Initial("Initial");
await behavior.Become("A");
Assert.That(behavior.Current, Is.EqualTo("A"));
var expected = new[]
{
"OnTransitioning_Initial_A",
"OnDeactivate_Initial",
"OnUnbecome_Initial",
"OnBecome_A",
"OnActivate_A",
"OnTransitioned_A_Initial"
};
AssertEvents(expected);
}