I started to write a test script for "Boolean Operators" with and w/o "Short-Circuit" in Perl.
And quickly found me needing to define and test "Truthiness" in Perl.
(Wait ... "0 but true" is false? Remembered it differently ;-)
And now I find myself obliged to also define "Contexts", because an empty list is also false.
And "Data Types", because internally it's more difficult, than just Scalar, Array and Hash.
It's a lot of work, but in the end it could help in many corners when done correctly:
- Regression testing between Perl versions
- Leading to a proper language definition
- Bottom up documenting the language in POD
- Helping to test cross implementations in other languages like in JS
Properly done means that it needs to be axiomatic, i.e. higher level tests need to only use features proven in lower levels.
Like so often, after a first success I find myself a bit stuck in the big picture.
I'll throw in my first approach as is for meditation.
There is a lot to be criticized, but my normal perfectionism is too risky and might lead to a never release cycle.
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