tests: run check-code.py on working directory files
If we insist on Mercurial sources to pass check-code.py, let automate the
process and make it part of the tests.
Objections?
#!/bin/sh
# test dirstate._dirs refcounting
hg init t
cd t
mkdir -p a/b/c/d
touch a/b/c/d/x
touch a/b/c/d/y
touch a/b/c/d/z
hg ci -Am m
hg mv a z