add a small test for contrib/check-code.py...
add a small test for contrib/check-code.py
This changeset adds a test file for contrib/check-code.py. This test runs
check-code.py against two small files. The first file should not raise any
check-code.py error while the second should. A line contains multiple errors to
verify the check-code.py behaviour: In the case of multiple errors at the same
line, the context line should only be displayed once.