public static async Task <TException> ThrowsAsync <TException>(Func <Task> action, params string[] possibleMessages)
where TException : Exception
{
try
{
await action();
Assert.Fail("Exception of type {0} expected. No exception thrown.", typeof(TException).Name);
return(null);
}
catch (TException ex)
{
if (possibleMessages == null || possibleMessages.Length == 0)
{
return(ex);
}
foreach (string possibleMessage in possibleMessages)
{
if (StringAssert.Equals(possibleMessage, ex.Message))
{
return(ex);
}
}
throw new Exception("Unexpected exception message." + Environment.NewLine + "Expected one of: " + string.Join(Environment.NewLine, possibleMessages) + Environment.NewLine + "Got: " + ex.Message + Environment.NewLine + Environment.NewLine + ex);
}
catch (Exception ex)
{
throw new Exception(string.Format("Exception of type {0} expected; got exception of type {1}.", typeof(TException).Name, ex.GetType().Name), ex);
}
}