How do I view CI test output?
CI results are visible via the Heroku Dashboard in the "Tests" tab. For this to work you need to make your tests use the TAP output format, printing to
stdout https://devcenter.heroku.com/articles/testpack-api#output The TAP format is described here: http://testanything.org/
When using the CLI, test results are available via the
heroku ci commands https://devcenter.heroku.com/articles/heroku-cli-commands#ci