I suggest you ...

Add an async-compatible Assert.ThrowsException

Win8 replaced ExpectedExceptionAttribute with Assert.ThrowsException. This is good, but there isn't an equivalent Assert.ThrowsExceptionAsync for async delegates.

Something like this would be fine:

public static async Task ThrowsExceptionAsync<TException>(Func<Task> action, bool allowDerivedTypes = true)
{
try
{
await action();
Assert.Fail("Delegate did not throw expected exception " + typeof(TException).Name + ".");
}
catch (Exception ex)
{
if (allowDerivedTypes && !(ex is TException))
Assert.Fail("Delegate threw exception of type " + ex.GetType().Name + ", but " + typeof(TException).Name + " or a derived type was expected.");
if (!allowDerivedTypes && ex.GetType() != typeof(TException))
Assert.Fail("Delegate threw exception of type " + ex.GetType().Name + ", but " + typeof(TException).Name + " was expected.");
}
}

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    Stephen ClearyStephen Cleary shared this idea  ·   ·  Flag idea as inappropriate…  ·  Admin →

    Thanks for taking the time to share this suggestion. This item has been around for a couple of versions of Visual Studio and we haven’t acted on it. Looking at the VS “15” plans, we’re not going to take action on this item, so we’re going to close it. If the suggestion is still relevant, please either take a look to see if there’s another suggestion that’s similar that you can vote on, or open a new suggestion.

    - The Visual Studio Team

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