public void SafeContinueWith_OnExceptionExceptionSet_HandlesException()
{
SpecificException specificException = new SpecificException();
Action <Exception> onException = new Mock <Action <Exception> >().Object;
SafeExecutionHelpers.Initialize();
var mockHelpers = new Mock <ISafeExecutionHelpers>();
SafeExecutionHelpers.SetImplementation(mockHelpers.Object);
var dts = new DeterministicTaskScheduler(shouldThrowExceptions: false);
var sut = new SafeTask();
sut.SafeContinueWith <Exception>(
Task.Factory.StartNew(
() => throw specificException,
CancellationToken.None,
TaskCreationOptions.None,
dts),
onException, //The crux
dts);
dts.RunTasksUntilIdle();
Assert.Contains(specificException, dts.Exceptions);
mockHelpers.Verify(h => h.HandleException(specificException, onException));
SafeExecutionHelpers.RevertToDefaultImplementation();
}
public void SafeContinueWith_DefaultExceptionHandlerSet_HandlesException()
{
SpecificException specificException = new SpecificException();
Action <Exception> defaultExceptionHandler = new Mock <Action <Exception> >().Object;
SafeExecutionHelpers.Initialize();
var mockHelpers = new Mock <ISafeExecutionHelpers>();
//Crux - DefaultHandler returns non-null delegate
mockHelpers.SetupGet(h => h.DefaultExceptionHandler).Returns(defaultExceptionHandler);
SafeExecutionHelpers.SetImplementation(mockHelpers.Object);
var dts = new DeterministicTaskScheduler(shouldThrowExceptions: false);
var sut = new SafeTask();
sut.SafeContinueWith <Exception>(
Task.Factory.StartNew(
() => throw specificException,
CancellationToken.None,
TaskCreationOptions.None,
dts),
null,
dts);
dts.RunTasksUntilIdle();
Assert.Contains(specificException, dts.Exceptions);
mockHelpers.Verify(h => h.HandleException <Exception>(specificException, null));
SafeExecutionHelpers.RevertToDefaultImplementation();
}
public void Execute_SecondCallAfterException_Executes()
{
SafeExecutionHelpers.Initialize();
var mockHelpers = new Mock <ISafeExecutionHelpers>();
SafeExecutionHelpers.SetImplementation(mockHelpers.Object);
Exception exception = new Exception();
int times = 0;
void MockTask(string text)
{
if (times++ == 0)
{
throw exception; //Throws only on first try
}
}
ICommand command = new SafeCommand <string>(MockTask);
//Assert.Throws<Exception>(()=>command.Execute("test"));
//First run
command.Execute("test");
mockHelpers.Verify(h => h.HandleException <Exception>(exception, null));
//Second run
command.Execute("test");
Assert.Equal(2, times);
SafeExecutionHelpers.RevertToDefaultImplementation();
}
public void HandleException_Exception_SpecificExceptionOnException_NotHandled()
{
SafeExecutionHelpers.Initialize();
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
var exception = new Exception();
var handler = new Mock <Action <SpecificException> >();
SafeExecutionHelpers.HandleException(exception, handler.Object);
Assert.Empty(handler.Invocations);
}
public void HandleException_SpecificException_SpecificExceptionOnException_Handled()
{
SafeExecutionHelpers.Initialize();
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
var exception = new SpecificException();
var handler = new Mock <Action <SpecificException> >();
SafeExecutionHelpers.HandleException(exception, handler.Object);
handler.Verify(h => h.Invoke(exception));
}
public void HandleException_ShouldRethrow_Throws()
{
Xamarin.Forms.Mocks.MockForms.Init(); //For Device.BeginInvokeOnMainThread
SafeExecutionHelpers.Initialize(shouldAlwaysRethrowException: true);
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
var exception = new NullReferenceException();
var handler = new Mock <Action <Exception> >();
Assert.Throws <NullReferenceException>(() => SafeExecutionHelpers.HandleException(exception, handler.Object));
handler.Verify(h => h.Invoke(exception));
}
public void HandleException_DefaultHandlerSet_Exception_ExceptionOnException_DefaultNotInvoked()
{
SafeExecutionHelpers.Initialize();
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
var defaultHandler = new Mock <Action <Exception> >();
SafeExecutionHelpers.SetDefaultExceptionHandler(defaultHandler.Object);
var exception = new Exception();
SafeExecutionHelpers.HandleException(exception, new Mock <Action <Exception> >().Object);
Assert.Empty(defaultHandler.Invocations);
}
public void Execute_TargetThrows_HandlesException()
{
SafeExecutionHelpers.Initialize();
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
var mockHelpers = new Mock <ISafeExecutionHelpers>();
SafeExecutionHelpers.SetImplementation(mockHelpers.Object);
Exception exception = new Exception();
var command = new SafeCommand(executeAction: () => throw exception);
//Assert.Throws<Exception>(() => command.Execute(null));
command.Execute(null);
mockHelpers.Verify(h => h.HandleException <Exception>(exception, null));
SafeExecutionHelpers.RevertToDefaultImplementation();
}
private void AfterEachTest()
{
SafeExecutionHelpers.Initialize(false);
SafeExecutionHelpers.RemoveDefaultExceptionHandler();
}