Wrote a test and fixed getsimplefader()

I honestly don’t know if anyone would ever use this method, but
whatever.
2.1.0
v1.1.0
v2.0.0
v2.1.0
Expanded tests

There’s still a non-passing test, but I wanted to commit this stuff
before I made further changes.
Hacking around async issues with this test.
Shortened this last test by quite a bit.
bump
2.1.1