xunit Assert.ThrowsAsync() does not work properly?
Just in case anyone wants to separate Act and Assert part, below code can be used:
//Act
Task result() => systemUnderTest.AsyncMethodThatThrows();
//Assert
await Assert.ThrowsAsync<Exception>(result);
You're supposed to await
the result (see xunit's acceptance tests for examples and alternate forms).
[Fact]
async void Test1()
{
await Assert.ThrowsAsync<ArgumentNullException>(() => MethodThatThrows());
}
In this specific degenerate case, you could just return
the Task
that Assert.ThrowsAsync
yields without using await
; but in that case, the key thing is to yield the Task
back to the xUnit framework, i.e.
[Fact]
Task Test1() =>
Assert.ThrowsAsync<ArgumentNullException>(MethodThatThrows);