From the looks of it it’s not yet possible to test a pipeline with the CLI?
bitrise run command only seems to like workflows
bitrise run pipeline_1 specified Workflow (pipeline_1) does not exist
Similarly triggering a pipeline via a trigger does not work:
bitrise trigger --push-branch test/pipeline workflow not specified
However I did notice that work was done to add pipelines to the trigger-check which does validate my trigger
bitrise trigger-check --push-branch test/pipeline push-branch: test/pipeline -> pipeline_1