Fix s plural noun

[george-gca]

Fixes #161

[jaraco]

Looks good. Thanks for the contrib. Can you add a test that captures the known bad cases (fails before and passes after this change)?

[george-gca]

Sure, but some of the failing cases are already there. I gave a quick look at your testing code and couldn't understand it, so I need to do a deep dive. Does your test code test the opposite, and also the same case? I mean, for example:

bass -> basses

Does your testing code tests

singular(bass)
plural(bass)
singular(basses)
plural(basses)

?

[jaraco]

Sure, but some of the failing cases are already there. I gave a quick look at your testing code and couldn't understand it, so I need to do a deep dive. Does your test code test the opposite, and also the same case? I mean, for example:

bass -> basses

Does your testing code tests

singular(bass)
plural(bass)
singular(basses)
plural(basses)

?

I'm not sure, but I'm guessing not. Historically, the project assumes valid inputs, so a call of singular(bass) or plural(basses) is considered invalid. That is, the project doesn't perform general-purpose semantic language comprehension, but instead provides simple inflection given known inputs.

I'm happy to accept more sophistication, but the status quo is somewhat limited.

[george-gca]

Actually some of the failing cases are like you said, singular(bass) or plural(basses). I will give it a thought about how to do some kind of verification before doing singularization/pluralization.

[george-gca]

Added test cases like jeans -> jeans

[jaraco]

Oops. I merged this not double-checking the tests and I see now they're failing, so I've force-pushed without those changes. Please re-submit.