public void MajorityWithFailureTask()
{
var timeMachine = new TimeMachine();
// Second task gives a different result
var task1 = timeMachine.AddSuccessTask(1, "x");
var task2 = timeMachine.AddFaultingTask <string>(2, new Exception("Bang!"));
var task3 = timeMachine.AddSuccessTask(3, "x");
var resultTask = MoreTaskEx.WhenMajority(task1, task2, task3);
Assert.IsFalse(resultTask.IsCompleted);
// Only one result so far - no consensus
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
// Second result is a failure
timeMachine.AdvanceTo(2);
Assert.IsFalse(resultTask.IsCompleted);
// Third result gives majority verdict
timeMachine.AdvanceTo(3);
Assert.AreEqual(TaskStatus.RanToCompletion, resultTask.Status);
Assert.AreEqual("x", resultTask.Result);
}
public void MajorityWithSomeDisagreement()
{
var timeMachine = new TimeMachine();
// Second task gives a different result
var task1 = timeMachine.AddSuccessTask(1, "x");
var task2 = timeMachine.AddSuccessTask(2, "y");
var task3 = timeMachine.AddSuccessTask(3, "x");
var resultTask = MoreTaskEx.WhenMajority(task1, task2, task3);
Assert.IsFalse(resultTask.IsCompleted);
// Only one result so far - no consensus
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
// Two results so far disagree
timeMachine.AdvanceTo(2);
Assert.IsFalse(resultTask.IsCompleted);
// Third result gives majority verdict
timeMachine.AdvanceTo(3);
Assert.AreEqual(TaskStatus.RanToCompletion, resultTask.Status);
Assert.AreEqual("x", resultTask.Result);
}
public void NullReferencesWithinSequence()
{
// Create a task just so we'd *otherwise* be valid
var timeMachine = new TimeMachine();
var task = timeMachine.AddSuccessTask(1, "x");
Assert.Throws <ArgumentException>(() => MoreTaskEx.WhenMajority(task, null));
}
public void InputOrderIsIrrelevant()
{
var timeMachine = new TimeMachine();
var task1 = timeMachine.AddSuccessTask(1, "x");
var task2 = timeMachine.AddSuccessTask(2, "x");
var task3 = timeMachine.AddSuccessTask(3, "x");
var resultTask = MoreTaskEx.WhenMajority(task3, task2, task1);
Assert.IsFalse(resultTask.IsCompleted);
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
timeMachine.AdvanceTo(2);
Assert.AreEqual(TaskStatus.RanToCompletion, resultTask.Status);
Assert.AreEqual("x", resultTask.Result);
}
public void EarlyFailure()
{
var timeMachine = new TimeMachine();
// Second task gives a different result
var task1 = timeMachine.AddCancelTask <string>(1);
var task2 = timeMachine.AddFaultingTask <string>(2, new Exception("Bang 2!"));
var task3 = timeMachine.AddSuccessTask(3, "x");
var resultTask = MoreTaskEx.WhenMajority(task1, task2, task3);
Assert.IsFalse(resultTask.IsCompleted);
// First result is a cancellation
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
// Second result is a failure. We now can't have a successful majority
timeMachine.AdvanceTo(2);
Assert.AreEqual(TaskStatus.Faulted, resultTask.Status);
}
public void SimpleSuccess()
{
var timeMachine = new TimeMachine();
// All three tasks return the same value.
var task1 = timeMachine.AddSuccessTask(1, "x");
var task2 = timeMachine.AddSuccessTask(2, "x");
var task3 = timeMachine.AddSuccessTask(3, "x");
var resultTask = MoreTaskEx.WhenMajority(task1, task2, task3);
Assert.IsFalse(resultTask.IsCompleted);
// Only one result so far - no consensus
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
// Second result gives a majority
timeMachine.AdvanceTo(2);
Assert.AreEqual(TaskStatus.RanToCompletion, resultTask.Status);
Assert.AreEqual("x", resultTask.Result);
}
public void NoMajority()
{
var timeMachine = new TimeMachine();
// Second task gives a different result
var task1 = timeMachine.AddSuccessTask(1, "x");
var task2 = timeMachine.AddSuccessTask(2, "y");
var task3 = timeMachine.AddSuccessTask(3, "z");
var resultTask = MoreTaskEx.WhenMajority(task1, task2, task3);
Assert.IsFalse(resultTask.IsCompleted);
// Only one result so far - no consensus
timeMachine.AdvanceTo(1);
Assert.IsFalse(resultTask.IsCompleted);
// Two results so far disagree
timeMachine.AdvanceTo(2);
Assert.IsFalse(resultTask.IsCompleted);
// Third result is different again
timeMachine.AdvanceTo(3);
Assert.AreEqual(TaskStatus.Faulted, resultTask.Status);
}
