@bcardarella @nhocki correct, by default teaspoon mounts on http://localhost:3000/teaspoon, you can also have the option to run test with the command line, which are by default run on development, from Teaspoon's  page:

> stay consistent with what you might see in the browser (since that's likely running in development)."

https://github.com/modeset/teaspoon#command-line-interface