lgtm,

Did you get any chance improving the cv_bridge tests ? they are still hanging on my machine so this will likely cause hangs or at least multiple-minute slow down on the builds (I'm going to merge this as is regardless but it would be great to fix the tests in the next version)

@gaoethan we usually don't release test packages as debians as they are not meant to be used by other packages but only for testing.

You can use a bouncy.ignore file in the release repository to skip this package when releasing

cv_bridge fails to build because it is missing a dependency on opencv: http://build.ros2.org/view/Bbin_uB64/job/Bbin_uB64__cv_bridge__ubuntu_bionic_amd64__binary/1/console

python_bindings.py test is failing because it depends on nose but doesn't declare a dependency on it.
It should either be converted to pytest (or unittest) or a test dependency on python3-nose should be added

The nose function assert_equal in question can be replaced with a plain assert. No need to depend on pytest / unittest / nose for that, e.g. assert x == y.

okay. thanks for your comments and I'll optimize accordingly.