FontForge test resources/procedures, for SVG or other areas?

I'm trying to make it possible to import SVG font files that use *stroked*
characters, rather than complete outlined characters.  Once done, I can
then programmatically apply modifications to the imported characters (all
1080+), such as flipping vertically and the excellent expandStroke().

I have this working with only two small changes, but one of these _could_
be a "breaking change", as it alters (corrects according to the argument
I'll make) the way that fontforge/svg.c handles open paths on SVG import.

Having peeked at the testing available with "make check" I rather fear that
nothing good _or_ bad can be proved about my proposed changes.  I face the
problem of how I can _show_ the change won't produce unexpected results for
the general user.

Has there been talk about improving FF testing in general?  Or in
individual areas such as SVG?

In researching the particular topic I came across the test pages at

http://www.w3.org/Graphics/SVG/Test/20110816/harness/htmlSVGWeb/index.html

I note that the Inkscape guy knows about these and has consulted them at

http://tavmjong.free.fr/INKSCAPE/W3C_SVG/htmlInkscapeHarness/full-index.html

These might serve as source material.  But I'd love to hear how people have
considered validating successful imports or successful exports.

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