tests/test-ui-color.py

keyword: fix regressions introduced in d87f3ff904ba

- dirstate of overwritten files must be forced to normal
  with kwexpand/kwshrink, not commit.
- recorded files must be weeded before overwriting.
- add test cases.

#!/usr/bin/env python

from hgext import color

# ensure errors aren't buffered
testui = color.colorui()
testui.pushbuffer()
testui.write('buffered\n')
testui.warn('warning\n')
testui.write_err('error\n')
print repr(testui.popbuffer())