public void AsyncValidation_SeveralAsyncRules_AllExecutedBeforeValidationCompleted()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel();
vm.Foo = null;
var validation = new ValidationHelper();
bool rule1Executed = false;
validation.AddAsyncRule(() =>
{
return(Task.Run(() =>
{
rule1Executed = true;
return RuleResult.Valid();
}));
});
bool rule2Executed = false;
validation.AddAsyncRule(() =>
{
return(Task.Run(() =>
{
rule2Executed = true;
return RuleResult.Valid();
}));
});
bool rule3Executed = false;
validation.AddAsyncRule(() =>
{
return(Task.Run(() =>
{
rule3Executed = true;
return RuleResult.Valid();
}));
});
validation.ValidateAllAsync().ContinueWith(r =>
{
Assert.True(rule1Executed);
Assert.True(rule2Executed);
Assert.True(rule3Executed);
Assert.True(r.Result.IsValid);
completedAction();
});
});
}
public void ValidatedAsync_AsyncRuleDoesnotCallCallback_ThrowsAnExceptionAfterTimeout()
{
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
validation.AsyncRuleExecutionTimeout = TimeSpan.FromSeconds(0.1);
var dummy = new DummyViewModel();
validation.AddAsyncRule(() => dummy.Foo,
onCompleted =>
{
// Do nothing
});
// ACT
var ui = TaskScheduler.FromCurrentSynchronizationContext();
validation.ValidateAllAsync().ContinueWith(result =>
{
Assert.True(result.IsFaulted, "Validation task must fail.");
Assert.NotNull(result.Exception);
completedAction();
}, ui);
});
}
public void ValidateAsync_WithCallback_ValidationOccuredAndCallbackIsCalledOnUIThread()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel();
vm.Foo = null;
bool ruleExecuted = false;
var validation = new ValidationHelper();
validation.AddAsyncRule(setResult =>
{
ruleExecuted = true;
setResult(RuleResult.Invalid("Error1"));
});
validation.ValidateAllAsync(result =>
{
Assert.True(ruleExecuted, "Validation rule must be executed before validation callback is called.");
Assert.Equal(dispatcher.Thread.ManagedThreadId, Thread.CurrentThread.ManagedThreadId);
completedAction();
});
});
}
public void AsyncValidation_DependantProperties_IfOneInvalidSecondIsInvalidToo()
{
TestUtils.ExecuteWithDispatcher((dispatcher, testCompleted) =>
{
var vm = new DummyViewModel
{
Foo = "abc",
Bar = "abc"
};
Func <bool> validCondition = () => vm.Foo != vm.Bar;
var validation = new ValidationHelper();
validation.AddAsyncRule(
() => vm.Foo,
() => vm.Bar,
setResult =>
{
ThreadPool.QueueUserWorkItem(_ =>
{
setResult(RuleResult.Assert(validCondition(), "Foo must be different than bar"));
});
});
validation.ValidateAsync(() => vm.Bar).ContinueWith(r =>
{
Assert.False(r.Result.IsValid, "Validation must fail");
Assert.True(r.Result.ErrorList.Count == 2, "There must be 2 errors: one for each dependant property");
testCompleted();
});
});
}
public void AsyncValidation_SeveralAsyncRules_AllExecutedBeforeValidationCompleted()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel();
vm.Foo = null;
var validation = new ValidationHelper();
bool rule1Executed = false;
validation.AddAsyncRule(setResultDelegate => ThreadPool.QueueUserWorkItem(_ =>
{
rule1Executed = true;
setResultDelegate(RuleResult.Valid());
}));
bool rule2Executed = false;
validation.AddAsyncRule(setResultDelegate => ThreadPool.QueueUserWorkItem(_ =>
{
rule2Executed = true;
setResultDelegate(RuleResult.Valid());
}));
bool rule3Executed = false;
validation.AddAsyncRule(setResultDelegate => ThreadPool.QueueUserWorkItem(_ =>
{
rule3Executed = true;
setResultDelegate(RuleResult.Valid());
}));
validation.ValidateAllAsync().ContinueWith(r =>
{
Assert.True(rule1Executed);
Assert.True(rule2Executed);
Assert.True(rule3Executed);
Assert.True(r.Result.IsValid);
completedAction();
});
});
}
public void AsyncValidation_ExecutedInsideUIThreadTask_ValidationRunsInBackgroundThread()
{
// This test checks the situation described here:
// http://stackoverflow.com/questions/6800705/why-is-taskscheduler-current-the-default-taskscheduler
// In short: if a continuation of a task runs on the UI thread, then the tasks that you start using
// Task.Factory.StartNew will run also on the UI thread. This is unexpected an may cause a deadlock, or freezing UI.
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
var dummy = new DummyViewModel();
int uiThreadId = Thread.CurrentThread.ManagedThreadId;
int validationThreadId = uiThreadId;
validation.AddAsyncRule(nameof(dummy.Foo),
() =>
{
return(Task.Run(() =>
{
validationThreadId = Thread.CurrentThread.ManagedThreadId;
return RuleResult.Valid();
}));
});
// ACT
// Execute validation within a continuation of another task that runs on
// current synchronization context, so that the TaskScheduler.Current is set to the
// UI context.
Task.Factory.StartNew(() => { }).ContinueWith(t =>
{
Task <ValidationResult> task = validation.ValidateAllAsync();
task.ContinueWith(result =>
{
// VERIFY
// Schedule the varification code with the dispatcher in order to take it
// out of the ContinueWith continuation. Otherwise the exceptions will be stored inside the task and
// unit testing framework will not know about them.
uiThreadDispatcher.BeginInvoke(new Action(() =>
{
Assert.False(uiThreadId == validationThreadId,
"Validation must be executed in a background thread, so that the UI thread is not blocked.");
completedAction();
}));
});
}, TaskScheduler.FromCurrentSynchronizationContext());
});
}
public void AsyncValidation_GeneralSmokeTest()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel {
Foo = null
};
var validation = new ValidationHelper();
bool ruleExecuted = false;
// OK, this is really strange, but if Action<bool> is not mentioned anywhere in the project, then ReSharter would fail to build and run the test...
// So including the following line to fix it.
Action <RuleResult> dummy = null;
Assert.Null(dummy); // Getting rid of the "unused variable" warning.
validation.AddAsyncRule(async() =>
{
return(await Task.Run(() =>
{
ruleExecuted = true;
return RuleResult.Invalid("Foo cannot be empty string.");
}));
});
validation.ResultChanged += (o, e) =>
{
Assert.True(ruleExecuted,
"Validation rule must be executed before ValidationCompleted event is fired.");
var isUiThread = dispatcher.Thread.ManagedThreadId == Thread.CurrentThread.ManagedThreadId;
Assert.True(isUiThread, "ValidationResultChanged must be executed on UI thread");
};
var ui = TaskScheduler.FromCurrentSynchronizationContext();
validation.ValidateAllAsync().ContinueWith(r =>
{
var isUiThread = dispatcher.Thread.ManagedThreadId == Thread.CurrentThread.ManagedThreadId;
Assert.True(isUiThread, "Validation callback must be executed on UI thread");
Assert.False(r.Result.IsValid, "Validation must fail according to the validaton rule");
Assert.False(validation.GetResult().IsValid, "Validation must fail according to the validaton rule");
Assert.True(ruleExecuted, "Rule must be executed before validation completed callback is executed.");
completedAction();
}, ui);
});
}
public async Task ValidateAsync_AsyncRuleRegisteredWithNewSyntax_RuleIsExecuted()
{
// ARRANGE
var validator = new ValidationHelper();
validator.AddAsyncRule(async() => await Task.Factory.StartNew(() => RuleResult.Invalid("error")));
// ACT
var result = await validator.ValidateAllAsync();
// VERIFY
Assert.False(result.IsValid);
}
public void Validate_ThereAreAsyncRules_ThrowsException()
{
// ARRANGE
var validation = new ValidationHelper();
// Add a simple sync rule
validation.AddRule(RuleResult.Valid);
// Add an async rule
validation.AddAsyncRule(() => Task.Run(() => RuleResult.Invalid("Error")));
// ACT
Assert.Throws <InvalidOperationException>(() => { validation.ValidateAll(); });
}
public void AsyncValidation_GeneralSmokeTest()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel {Foo = null};
var validation = new ValidationHelper();
bool ruleExecuted = false;
// OK, this is really strange, but if Action<bool> is not mentioned anywhere in the project, then ReSharter would fail to build and run the test...
// So including the following line to fix it.
Action<RuleResult> dummy = null;
Assert.Null(dummy); // Getting rid of the "unused variable" warning.
validation.AddAsyncRule(setResult => ThreadPool.QueueUserWorkItem(_ =>
{
ruleExecuted = true;
setResult(RuleResult.Invalid("Foo cannot be empty string."));
}));
validation.ResultChanged += (o, e) =>
{
Assert.True(ruleExecuted, "Validation rule must be executed before ValidationCompleted event is fired.");
var isUiThread = dispatcher.Thread.ManagedThreadId == Thread.CurrentThread.ManagedThreadId;
Assert.True(isUiThread, "ValidationResultChanged must be executed on UI thread");
};
var ui = TaskScheduler.FromCurrentSynchronizationContext();
validation.ValidateAllAsync().ContinueWith(r =>
{
var isUiThread = dispatcher.Thread.ManagedThreadId == Thread.CurrentThread.ManagedThreadId;
Assert.True(isUiThread, "Validation callback must be executed on UI thread");
Assert.False(r.Result.IsValid, "Validation must fail according to the validaton rule");
Assert.False(validation.GetResult().IsValid, "Validation must fail according to the validaton rule");
Assert.True(ruleExecuted, "Rule must be executed before validation completed callback is executed.");
completedAction();
}, ui);
});
}
public async void AsyncValidation_RuleThrowsException_ExceptionIsPropogated()
{
// ARRANGE
var validator = new ValidationHelper();
validator.AddAsyncRule(async() =>
{
await
Task.Factory.StartNew(() => { throw new InvalidOperationException("Test"); }, CancellationToken.None,
TaskCreationOptions.None, TaskScheduler.Default);
return(RuleResult.Valid());
});
// ACT & VERIFY
await Assert.ThrowsAsync <ValidationException>(() => validator.ValidateAllAsync());
}
public void AsyncValidation_MultipleRulesForSameTarget_DoesNotExecuteRulesIfPerviousFailed()
{
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
var dummy = new DummyViewModel();
bool firstRuleExecuted = false;
bool secondRuleExecuted = false;
validation.AddRule(nameof(dummy.Foo),
() =>
{
firstRuleExecuted = true;
return(RuleResult.Invalid("Error1"));
});
validation.AddAsyncRule(nameof(dummy.Foo),
() =>
{
return(Task.Run(() =>
{
secondRuleExecuted = true;
return RuleResult.Invalid("Error2");
}));
});
// ACT
validation.ValidateAllAsync().ContinueWith(result =>
{
// VERIFY
Assert.True(firstRuleExecuted, "First rule must have been executed");
Assert.False(secondRuleExecuted,
"Second rule should not have been executed because first rule failed.");
completedAction();
});
});
}
public async void MixedValidation_SyncRuleThrowsExceptionAfterSuccesfullAsyncRule_ExceptionIsPropogated()
{
// ARRANGE
var validator = new ValidationHelper();
validator.AddAsyncRule(async() =>
{
return(await Task.Run(() => RuleResult.Valid()));
});
validator.AddRule(() => { throw new InvalidOperationException("Test"); });
// ACT & VERIFY
var task = Assert.ThrowsAsync <ValidationException>(() => validator.ValidateAllAsync());
if (task != await Task.WhenAny(task, Task.Delay(TimeSpan.FromSeconds(5))))
{
Assert.True(false, "Looks like the validation is stuck (didn't complete in a timeout), which means it didn't handle the exception properly.");
}
}
public void AsyncValidation_RuleThrowsException_ExceptionIsPropogated()
{
// ARRANGE
var validator = new ValidationHelper();
validator.AddAsyncRule(async () =>
{
await Task.Factory.StartNew(() =>
{
throw new InvalidOperationException("Test");
}, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default);
return RuleResult.Valid();
});
// ACT & VERIFY
Assert.Throws<ValidationException>(validator.ValidateAllAsync());
}
public void ValidateAllAsync_SimilteniousCalls_DoesNotFail()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
const int numThreadsPerIternation = 4;
const int iterationCount = 10;
const int numThreads = numThreadsPerIternation * iterationCount;
var resetEvent = new ManualResetEvent(false);
int toProcess = numThreads;
var validation = new ValidationHelper();
for (int i = 0; i < iterationCount; i++)
{
var target1 = new object();
var target2 = new object();
validation.AddAsyncRule(setResult =>
{
setResult(RuleResult.Invalid("Error1"));
});
validation.AddAsyncRule(target1, setResult =>
{
setResult(RuleResult.Valid());
});
validation.AddRule(target2, () =>
{
return(RuleResult.Invalid("Error2"));
});
validation.AddRule(target2, RuleResult.Valid);
Action <Action> testThreadBody = exercise =>
{
try
{
exercise();
if (Interlocked.Decrement(ref toProcess) == 0)
{
resetEvent.Set();
}
}
catch (Exception ex)
{
dispatcher.BeginInvoke(new Action(() =>
{
throw new AggregateException(ex);
}));
}
};
var thread1 = new Thread(() =>
{
testThreadBody(() =>
{
validation.ValidateAllAsync().Wait();
});
});
var thread2 = new Thread(() =>
{
testThreadBody(() =>
{
validation.ValidateAllAsync().Wait();
});
});
var thread3 = new Thread(() =>
{
testThreadBody(() =>
{
validation.Validate(target2);
});
});
var thread4 = new Thread(() =>
{
testThreadBody(() =>
{
validation.Validate(target2);
});
});
thread1.Start();
thread2.Start();
thread3.Start();
thread4.Start();
}
ThreadPool.QueueUserWorkItem(_ =>
{
resetEvent.WaitOne();
completedAction();
});
});
}
public void AsyncValidation_MixedAsyncAndNotAsyncRules_AllExecutedBeforeValidationCompleted()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel();
var validation = new ValidationHelper();
bool rule1Executed = false;
validation.AddAsyncRule(vm, setResultDelegate => ThreadPool.QueueUserWorkItem(_ =>
{
rule1Executed = true;
setResultDelegate(RuleResult.Valid());
}));
bool rule2Executed = false;
validation.AddRule(vm, () =>
{
rule2Executed = true;
return RuleResult.Valid();
});
bool rule3Executed = false;
validation.AddAsyncRule(vm, setResultDelegate => ThreadPool.QueueUserWorkItem(_ =>
{
rule3Executed = true;
setResultDelegate(RuleResult.Valid());
}));
validation.ValidateAllAsync().ContinueWith(r =>
{
Assert.True(rule1Executed);
Assert.True(rule2Executed);
Assert.True(rule3Executed);
Assert.True(r.Result.IsValid);
completedAction();
});
});
}
public void ValidateAsync_MultipleRulesForSameTarget_DoesNotExecuteRulesIfPerviousFailed()
{
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
var dummy = new DummyViewModel();
bool firstRuleExecuted = false;
bool secondRuleExecuted = false;
validation.AddRule(() => dummy.Foo,
() =>
{
firstRuleExecuted = true;
return RuleResult.Invalid("Error1");
});
validation.AddAsyncRule(() => dummy.Foo,
onCompleted =>
{
secondRuleExecuted = true;
onCompleted(RuleResult.Invalid("Error2"));
});
// ACT
validation.ValidateAllAsync().ContinueWith(result =>
{
// VERIFY
Assert.True(firstRuleExecuted, "First rule must have been executed");
Assert.False(secondRuleExecuted, "Second rule should not have been executed because first rule failed.");
completedAction();
});
});
}
public void ValidatedAsync_AsyncRuleDoesnotCallCallback_ThrowsAnExceptionAfterTimeout()
{
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
validation.AsyncRuleExecutionTimeout = TimeSpan.FromSeconds(0.1);
var dummy = new DummyViewModel();
validation.AddAsyncRule(() => dummy.Foo,
onCompleted =>
{
// Do nothing
});
// ACT
var ui = TaskScheduler.FromCurrentSynchronizationContext();
validation.ValidateAllAsync().ContinueWith(result =>
{
Assert.True(result.IsFaulted, "Validation task must fail.");
Assert.NotNull(result.Exception);
completedAction();
}, ui);
});
}
public void Validate_ThereAreAsyncRules_ThrowsException()
{
// ARRANGE
var validation = new ValidationHelper();
// Add a simple sync rule
validation.AddRule(RuleResult.Valid);
// Add an async rule
validation.AddAsyncRule(onCompleted => onCompleted(RuleResult.Invalid("Error")));
// ACT
Assert.Throws<InvalidOperationException>(() =>
{
validation.ValidateAll();
});
}
public void ValidatedAsync_ExecutedInsideUIThreadTask_ValidationRunsInBackgroundThread()
{
// This test checks the situation described here:
// http://stackoverflow.com/questions/6800705/why-is-taskscheduler-current-the-default-taskscheduler
// In short: if a continuation of a task runs on the UI thread, then the tasks that you start using
// Task.Factory.StartNew will run also on the UI thread. This is unexpected an may cause a deadlock, or freezing UI.
TestUtils.ExecuteWithDispatcher((uiThreadDispatcher, completedAction) =>
{
// ARRANGE
var validation = new ValidationHelper();
var dummy = new DummyViewModel();
int uiThreadId = Thread.CurrentThread.ManagedThreadId;
int validationThreadId = uiThreadId;
validation.AddAsyncRule(() => dummy.Foo,
onCompleted =>
{
validationThreadId = Thread.CurrentThread.ManagedThreadId;
onCompleted(RuleResult.Valid());
});
// ACT
// Execute validation within a continuation of another task that runs on
// current synchronization context, so that the TaskScheduler.Current is set to the
// UI context.
Task.Factory.StartNew(() => { }).ContinueWith(t =>
{
Task<ValidationResult> task = validation.ValidateAllAsync();
task.ContinueWith(result =>
{
// VERIFY
// Schedule the varification code with the dispatcher in order to take it
// out of the ContinueWith continuation. Otherwise the exceptions will be stored inside the task and
// unit testing framework will not know about them.
uiThreadDispatcher.BeginInvoke(new Action(() =>
{
Assert.False(uiThreadId == validationThreadId, "Validation must be executed in a background thread, so that the UI thread is not blocked.");
completedAction();
}));
});
}, TaskScheduler.FromCurrentSynchronizationContext());
});
}
public void ValidateAsync_WithCallback_ValidationOccuredAndCallbackIsCalledOnUIThread()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
var vm = new DummyViewModel();
vm.Foo = null;
bool ruleExecuted = false;
var validation = new ValidationHelper();
validation.AddAsyncRule(setResult =>
{
ruleExecuted = true;
setResult(RuleResult.Invalid("Error1"));
});
validation.ValidateAllAsync(result =>
{
Assert.True(ruleExecuted, "Validation rule must be executed before validation callback is called.");
Assert.Equal(dispatcher.Thread.ManagedThreadId, Thread.CurrentThread.ManagedThreadId);
completedAction();
});
});
}
public async Task ValidateAsync_AsyncRuleRegisteredWithNewSyntax_RuleIsExecuted()
{
// ARRANGE
var validator = new ValidationHelper();
validator.AddAsyncRule(async () => await Task.Factory.StartNew(() => RuleResult.Invalid("error")));
// ACT
var result = await validator.ValidateAllAsync();
// VERIFY
Assert.False(result.IsValid);
}
public void ValidateAllAsync_SimilteniousCalls_DoesNotFail()
{
TestUtils.ExecuteWithDispatcher((dispatcher, completedAction) =>
{
const int numThreadsPerIternation = 4;
const int iterationCount = 10;
const int numThreads = numThreadsPerIternation * iterationCount;
var resetEvent = new ManualResetEvent(false);
int toProcess = numThreads;
var validation = new ValidationHelper();
for (int i = 0; i < iterationCount; i++)
{
var target1 = new object();
var target2 = new object();
validation.AddAsyncRule(setResult =>
{
setResult(RuleResult.Invalid("Error1"));
});
validation.AddAsyncRule(target1, setResult =>
{
setResult(RuleResult.Valid());
});
validation.AddRule(target2, () =>
{
return RuleResult.Invalid("Error2");
});
validation.AddRule(target2, RuleResult.Valid);
Action<Action> testThreadBody = exercise =>
{
try
{
exercise();
if (Interlocked.Decrement(ref toProcess) == 0)
resetEvent.Set();
}
catch (Exception ex)
{
dispatcher.BeginInvoke(new Action(() =>
{
throw new AggregateException(ex);
}));
}
};
var thread1 = new Thread(() =>
{
testThreadBody(() =>
{
validation.ValidateAllAsync().Wait();
});
});
var thread2 = new Thread(() =>
{
testThreadBody(() =>
{
validation.ValidateAllAsync().Wait();
});
});
var thread3 = new Thread(() =>
{
testThreadBody(() =>
{
validation.Validate(target2);
});
});
var thread4 = new Thread(() =>
{
testThreadBody(() =>
{
validation.Validate(target2);
});
});
thread1.Start();
thread2.Start();
thread3.Start();
thread4.Start();
}
ThreadPool.QueueUserWorkItem(_ =>
{
resetEvent.WaitOne();
completedAction();
});
});
}
public void AsyncValidation_DependantProperties_IfOneInvalidSecondIsInvalidToo()
{
TestUtils.ExecuteWithDispatcher((dispatcher, testCompleted) =>
{
var vm = new DummyViewModel
{
Foo = "abc",
Bar = "abc"
};
Func<bool> validCondition = () => vm.Foo != vm.Bar;
var validation = new ValidationHelper();
validation.AddAsyncRule(
() => vm.Foo,
() => vm.Bar,
setResult =>
{
ThreadPool.QueueUserWorkItem(_ =>
{
setResult(RuleResult.Assert(validCondition(), "Foo must be different than bar"));
});
});
validation.ValidateAsync(() => vm.Bar).ContinueWith(r =>
{
Assert.False(r.Result.IsValid, "Validation must fail");
Assert.True(r.Result.ErrorList.Count == 2, "There must be 2 errors: one for each dependant property");
testCompleted();
});
});
}
