Could not open input file: vendor/bin/../../utils/make-phar.php

Where is that script located now?

Or should that test be removed?

That script is now part of the wp-cli/wp-cli-bundle package and located at utils/make-phar.php in that package.

@schlessera Sounds like wp-cli/wp-cli-tests needs wp-cli/wp-cli-bundle as a dependency then:

https://github.com/wp-cli/wp-cli-tests/blob/2d996e8a136e863718070f5bb07fe861430530c0/features/bootstrap/FeatureContext.php#L541-L547

@swissspidy No, I moved tests that create new Phars into the wp-cli/wp-cli-bundle repository. We should move this one too.