This should have a test in https://github.com/wp-cli/wp-cli/blob/master/features/wp-config.feature to make sure we don't introduce a regression later on.

@schlessera I am developing behat tests for it.

@schlessera I have added all behat tests for --config-file param in the https://github.com/wp-cli/config-command/pull/104/files

I am not understanding which tests I should write for this PR.

@pmbaldha My bad, I don't think we need a test here. This is not externally accessible, and the Behat test from the other package already tests it in terms of safeguarding it against a regression.

Note: GitHub allows you to directly commit suggestions like the one I made above via the Commit suggestion button below the comment. That is generally less error-prone.