Update hypb:in-string-p test

[matsl]

What

Update hypb:in-string-p tests.

Why

Create usable tests while working on fixing different edge cases.

[matsl]

@rswgnu Here is the updated tests for hypb:in-string-p. If you need other tests or modifications just comment in the PR and I'll try to update.

[matsl]

@rswgnu I missed to update the "not within" part to "outside" before creating the PR. I'll wait with this until next update or review comment.

[rswgnu]

Please apply update when you have a chance. Instead of 'not within', it should say, 'outside string text'. When inside, 'inside string text'. That way, we know that there is no claim that it is on a delimiter. We're likely going to have to set up to test that as well after we cover the basics.
'

[rswgnu]

Please apply update when you have a chance. Instead of 'not within', it should say, 'outside string text'. When inside, 'inside string text'. That way, we know that there is no claim that it is on a delimiter. We're likely going to have to set up to test that as well after we cover the basics.
'

[rswgnu]

@matsl, I suggest you move all the string tests in one "string-tests.el" file so we can work with them there easily. I really need to see your changes here in one file to work with it easily before we merge.

[rswgnu]

I have started looking at the string issues now and have a test function to add that shows when the in-string check of the Emacs (ppss) function differs from the result of hypb:in-string-p, making it easy to look at any descrepencies.