If certain sections of skip_callback method are commented out then no test was failing. Tests have been added to ensure that commenting out the code within if loop would cause test failure.
If certain sections of skip_callback method are commented out then
no test was failing. Tests have been added to ensure that commenting
out the code within if loop would cause test failure.

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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