Advantage of async/await over blocking in unit tests

Modern unit tests frameworks support awaiting the results of an asychronous unit test, like this:

public async Task SomeTest()
{
    var result = await SomeMethodAsync();
    // ... Verify the result ...
}

Is there any advantage of using this async approach over simply blocking?

public void SomeTest()
{
    var result = SomeMethodAsync().Result;
    // ... Verify the result ...
}

Does the async only provide a benefit when running tests in parallel?