test: add error case: 'the previous segment must be M/L/C'

[yisibl]

This is a normal error thrown by resvg when parsing Path Command and has been confirmed as fixed in resvg 0.30.0(see commit).

---

Some special svg paths can raise errors, add a test to ensure it is now fixed.

thread '<unnamed>' panicked at 'the previous segment must be M/L/C'

note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5

Test svg

<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Google News</title><path d="M21.267 21.2a.614.614 0 0 1-.613.613H3.344a.614.614 0 0 1-.612-.613V8.115a.614.614 0 0 1 .613-.613h17.309a.614.614 0 0 1 .613.613V21.2zm-3.032-3.42v-1.195a.08.08 0 0 0-.08-.08h-5.373v1.361h5.373a.082.082 0 0 0 .08-.083v-.003zm.817-2.587v-1.201a.08.08 0 0 0-.079-.082h-6.19v1.362h6.189a.079.079 0 0 0 .08-.078v-.004.003zm-.817-2.588V11.4a.08.08 0 0 0-.08-.08h-5.373v1.361h5.373a.082.082 0 0 0 .08-.079v.004zM8.15 14.045v1.226h1.77c-.145.748-.804 1.292-1.77 1.292a1.976 1.976 0 0 1 0-3.95 1.77 1.77 0 0 1 1.253.49l.934-.932a3.14 3.14 0 0 0-2.187-.853 3.268 3.268 0 1 0 0 6.537c1.89 0 3.133-1.328 3.133-3.197a3.941 3.941 0 0 0-.052-.619l-3.08.006zM2.27 7.654a.616.616 0 0 1 .613-.613h12.154l-1.269-3.49a.595.595 0 0 0-.743-.383L.368 7.775a.594.594 0 0 0-.323.775l2.225 6.112V7.654za.616.616 0 0 1 .613-.613h12.154l-1.269-3.49a.595.595 0 0 0-.743-.383L.368 7.775a.594.594 0 0 0-.323.775l2.225 6.112V7.654zm21.312-.31l-8.803-2.37.751 2.067h5.584a.614.614 0 0 1 .613.613v8.794l2.247-8.366a.592.592 0 0 0-.392-.739zm-4.496-1.675V2.795a.61.61 0 0 0-.611-.608H5.524a.61.61 0 0 0-.616.605v2.837l8.39-3.052a.594.594 0 0 1 .743.39l.544 1.497 4.501 1.205z"/></svg>

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Name	Status	Preview	Comments	Updated
resvg-js	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 8, 2023 at 1:46PM (UTC)

[yisibl]

Hi @RazrFalcon, can you help confirm that this is caused by kurbo <= 0.8? https://github.com/RazrFalcon/resvg/blob/f146503f84c48875f39a159a8ca4a41833abd090/usvg/src/pathdata.rs#L219

[RazrFalcon]

No, kurbo shouldn't affect this. Will take a look.

[RazrFalcon]

I cannot reproduce the panic even on older resvg. Can you clarify how did you able to trigger it?

[yisibl]

Wait, I'll submit a test case for resvg.

Test case: linebender/resvg#577