public async Task AsyncThrowsExceptionExactlyOfStaticType()
{
async Task a()
{
await Task.Delay(1); throw new ArgumentNullException("id");
}
Func <Task> action = a;
ArgumentException ae;
// MSTest
ae = await MSTestAssert.ThrowsExceptionAsync <ArgumentException>(action, "Some context");
// Assert.ThrowsException failed. Threw exception ArgumentNullException, but exception ArgumentException was expected. Some context
// Exception Message: Value cannot be null.
// Parameter name: id
// Stack Trace: ...
// NUnit does not support this use case.
// XUnit
ae = await XUnitAssert.ThrowsAsync <ArgumentException>(action);
// Assert.Throws() Failure
// Expected: typeof(System.ArgumentException)
// Actual: typeof(System.ArgumentNullException): Value cannot be null.
// Parameter name: id
// ---- System.ArgumentNullException: Value cannot be null.
// Parameter name: id
// Fluent
ae = action.Should().ThrowExactly <ArgumentException>("SOME REASONS").Which;
// Expected type to be System.ArgumentException because SOME REASONS, but found System.ArgumentNullException.
// Shouldly does not support this case.
}
/// <inheritDoc/>
public static async Task <T> ThrowsExceptionAsync <T>(this Func <Task> action) where T : Exception
{
return(await Assert.ThrowsExceptionAsync <T>(action));
}
