Code massage for the test fixture class

[antiagainst]

The name of TextToBinaryTest[Base] is outdated; we actually have roundtrip test methods inside it. I'd like to change it to RoundTripTest[Base]. And also, rename the methods inside it to something like {Encode|Decode}...{Succeeded|Failed}....

Opinions?

[dneto0]

I like the CompiledInstructions name. That's very clear.
I don't like the "Encode" because, especially in a round trip sense, it's not clear what the originating format is, text or binary.
I'd rather not make this change.

[antiagainst]

I don't care about the naming that much; I just want to make sure they are consistent (like changing the Encode to Compiled). But since there are objections, I'll not do it.