public void WrapTimedOut()
{
// Arrange
ManualResetEvent waitHandle = new ManualResetEvent(false /* initialState */);
AsyncCallback callback = ar => {
waitHandle.Set();
};
// Act & assert
IAsyncResult asyncResult = AsyncResultWrapper.WrapWithTimeout(callback, null,
(innerCallback, innerState) => new MockAsyncResult(),
ar => {
Assert.Fail("This callback should never execute since we timed out.");
},
0);
// wait for the timeout
waitHandle.WaitOne();
ExceptionHelper.ExpectException <TimeoutException>(
delegate {
AsyncResultWrapper.UnwrapAndContinue(asyncResult);
});
}
public void UnwrapAndContinueThrowsIfAsyncResultIsNull()
{
// Act & assert
ExceptionHelper.ExpectArgumentNullException(
delegate {
AsyncResultWrapper.UnwrapAndContinue(null);
}, "asyncResult");
}
public void UnwrapAndContinueExecutesStoredDelegateAndReturnsValue()
{
// Arrange
IAsyncResult result = AsyncResultWrapper.Wrap(null, null,
(callback, state) => new MockAsyncResult(),
ar => 42);
// Act
int returned = AsyncResultWrapper.UnwrapAndContinue <int>(result);
// Assert
Assert.AreEqual(42, returned);
}
public void UnwrapAndContinueThrowsIfAsyncResultIsIncorrectType()
{
// Arrange
IAsyncResult result = AsyncResultWrapper.Wrap(null, null,
(callback, state) => new MockAsyncResult(),
ar => { });
// Act & assert
ExceptionHelper.ExpectArgumentException(
delegate {
AsyncResultWrapper.UnwrapAndContinue <int>(result);
},
@"The provided IAsyncResult is not valid for this method.
Parameter name: asyncResult");
}
public void UnwrapAndContinueThrowsIfCalledTwiceOnSameAsyncResult()
{
// Arrange
IAsyncResult result = AsyncResultWrapper.Wrap(null, null,
(callback, state) => new MockAsyncResult(),
ar => { });
// Act & assert
AsyncResultWrapper.UnwrapAndContinue(result);
ExceptionHelper.ExpectArgumentException(
delegate {
AsyncResultWrapper.UnwrapAndContinue(result);
},
@"The provided IAsyncResult has already been consumed.
Parameter name: asyncResult");
}
public void UnwrapAndContinueThrowsIfAsyncResultTagMismatch()
{
// Arrange
IAsyncResult result = AsyncResultWrapper.Wrap(null, null,
(callback, state) => new MockAsyncResult(),
ar => { },
"some tag");
// Act & assert
ExceptionHelper.ExpectArgumentException(
delegate {
AsyncResultWrapper.UnwrapAndContinue(result, "some other tag");
},
@"The provided IAsyncResult is not valid for this method.
Parameter name: asyncResult");
}