Tests can be run through the test running script: npm test.
View its options with: npm test -- --help.
Options are default on or off depending on whether they need a specific environment setup to run. E.g. the e2e tests don't run by default because you need to run a rari and fred server.
To run only unit tests:
npm test -- --lint false
To run e2e tests against already running fred and rari servers:
npm test -- --e2e
To only run e2e tests and bring up a fred dev server and rari server:
npm test -- --lint false --unit false --e2e --fred dev --rari