Core htmx internals Tests

• tokenizes correctly1ms ‣

  chai.expect(htmx._('tokenizeString')('a,')).to.be.deep.equal(['a', ','])
  chai.expect(htmx._('tokenizeString')('aa,')).to.be.deep.equal(['aa', ','])
  chai.expect(htmx._('tokenizeString')('aa,aa')).to.be.deep.equal(['aa', ',', 'aa'])
  chai.expect(htmx._('tokenizeString')('aa.aa')).to.be.deep.equal(['aa', '.', 'aa'])