Testing Scala programs with Travis CI on OS X

.travis.yml

language: java
env:
  - SCALA_VERSION=2.11.7
os:
  - osx
script:
  - ./sbt "++$SCALA_VERSION" test
matrix:
  include:
    - env: SCALA_VERSION=2.11.7
      os: linux
      jdk: oraclejdk7
    - env: SCALA_VERSION=2.10.5
      os: linux
      jdk: oraclejdk8

manual.md

Testing Scala programs with Travis CI on OS X

Since a while ago, the fine folks at Travis CI offer OS X builds. Those machines also have Java installed, but just one version (1.7.0_45 at time of writing). The usual jdk_switcher mechanism is unavailable. Futhermore, Scala is not available. Luckily, it is possible to define a cross-platform (Linux and OS X) build within these constraints.

1. Include @paulp's sbt launcher into the root of your repository. You can obtain a copy here. Alternatively, you can add an install step to your .travis.yml which fetches it before the build. (See the instructions in the README of sbt-extras.)
2. Set the language entry in your .travis.yml to java.
3. Remove the jdk and the scala entries.
4. Instead, add a new top-level entry env which contains an item SCALA_VERSION=2.11.7 for each Scala version you want to test on.
5. Add a new top-level entry os with the single item osx. It is important that it only contains osx and not linux.
6. Add a new top-level entry matrix with sub-entry include. See the example file in this Gist for an idea what it should look like.

Real-world examples

• libisabelle

Official documentation

For details on what exactly is available on the OS X boxes, see the official documentation.