tests: choose the path separator in PYTHONPATH suitable for platform
Before this patch, test code introduced by
e3a5922e18c3 into
test-extension.t always uses ":" as the path separator in PYTHONPATH.
But ";" should be used on Windows.
This patch chooses the path separator in PYTHONPATH suitable for
platform.
util: warn when adding paths ending with \
Paths ending with \ will fail the verification introduced in
684a977c2ae0 when
checking out on Windows ... and if it didn't fail it would probably not do what
the user expected.