add CTS parse tests

[k2d222]

No description provided.

[mighdoll]

for readability, it'd be nice to have the src in multiline strings rather than with inline \n chars.
i.e use src: `` . I can do that as a separate commit if you'd like though!

[k2d222]

yup! well ideally in the ts files the test cases should be parametric too. But I think it would be too much hassle to extract from cts.

[k2d222]

yup! well ideally in the ts files the test cases should be parametric too. But I think it would be too much hassle to extract from cts.