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6f8257e437
This change is only verifiable in configure builds; cmake only executes the basic test. The previous version of tests/pngtest-all only returned the status code of the final test. Apparently it could never fail. This adds checking of all return status codes. The change also adds a basic approach for regression testing with PNGs that should fail a test; --strict ensures that PNGs which are valid do not start to be reported as erroneous, this is the inverse. At present the code (minimal traditional Bourne shell) only tests the palette index checking code, a potentially important check if apps rely on it. The changes have been tested using the configure build both with a regression which causes the libpng checking to cease to work and with a corrected (reverted regression). The regression test verifies that the intended check works as expected. Signed-off-by: John Bowler <jbowler@acm.org>