You have to test the changes you want to push. That's the whole basis of CI/CD. The question is at which stage are you ok with seeing your pipeline build.

If you accept that you can block your whole pipeline by merging a bad PR then that's ok.

In the meantime, it is customary to configure pipelines to run unit, integration tests, and sometimes even contract tests when creating a feature branch. Some platforms even provide high-level support for spinning up sandbox environment as part of their pipeline infrastructure.