sbt-tutorial.md

SBT manages your projects dependencies, and provides many tasks for you to run.

You can run a task by providing it as an argument to SBT. (E.g. sbt run)

You can run multiple tasks by providing multiple arguments to SBT. (E.g. sbt clean run)

Useful tasks

• compile will compile all your production code
• clean will delete the compiled code
• test runs all the tests in a project
• run starts the application in development mode
• start starts the application in production mode

Continually running a task

By prefixing any task with a tilde ~, SBT will continually run the task on any source change.

E.g. sbt ~test will run all the tests after every change

Useful test tasks

• test-only lets you restrict the tests:
  • ./sbt "test-only *.HotelsControllerSpec"
• test-only can be combined with ~ and can run multiple tests:
  • ./sbt "~test-only *.HotelsControllerSpec *.HotelsServiceTest"
• test-quick will only run tests that failed in the previous run.
  • sbt ~test-quick This will run all tests, and then only the tests that have failed.