Refactor build-default tests for more explicitness and correctness checks

[agilgur5]

Description

Summary by Commit Message

refactor: move unbundled regenerator test to build-options

• I accidentally put it into build-default before build-options existed, but the test very specifically tests an option, --target node, so it should be in build-options as that's not a zero-config default

refactor: use a less noisy side-effect for async regression test

• the previous console.log statement would actually log out because one of the tests imports (requires) the actual built library in order to ensure correctness

refactor: be more descriptive than "blah", "foo", "bar" in tests

fix/docs: basic README should reference .ts, not .tsx files

• it uses normal .ts files and no JSX (that's what the React template is for after all), so README shouldn't mention .tsx

• woops, this was probably a copy+paste error on my behalf when I was improving the basic template's docs

This one is unrelated to the rest, just found it as I was refactoring for the previous commit

refactor/test: test for correctness of syntax, not just parsing

• have most of the syntax tests export a function that returns true if the syntax is evaluated correctly, and test that it does in fact return true

Tags

• Fixes everything in https://github.com/formium/tsdx/pull/795#pullrequestreview-492994343 that I missed in initial review of #795 it. build-options was only just added with my smoke test in #896, so I must've forgot to split out files before.
• Basic template using ".tsx" in the README was a mistake I made in #706

• 41 and #46 previously removed some swear words, but not all

• Syntax tests are from several PRs over time

Review Notes

Been wanting to do the explicitness for a while. Consistency in the syntax testing I thought would help (for my own use writing tests too) and correctness seemed to make more sense and was something I already did with the generator test (so this makes the others consistent in checking for correctness as well). I didn't actually add correctness tests (i.e. checking the value) until now, maybe because I forgot I already had a place in the test suite to do so.

This doesn't change any actual source code or meaningful template code.

Will rebase these in.

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[agilgur5]

Test passes now, not sure why it failed that one time. First time I've seen that error and it's in a section of the test suite that I didn't change and a not so important test, so going to merge.