Extend test_check_package to also check the ignore list functionality.
Check:
- the entries in the ignore list use relative path;
- an entry in the ignore list actually ignores the warning;
- an outdated entry in the ignore list generates a warning by its own,
preventing the ignoring list to grow indefinitely.
For this to work, add 3 test fixtures, listing entries for an
pre-existing file in the br2-external used in the test.
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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