In the next commit Pierre will start adding tests for the docker build, and this
lays out the structure for doing that.
No functional changes.
The relevant TravisCI docs that motivates moving under a jobs section is
https://docs.travis-ci.com/user/build-matrix/
> There are two ways to specify multiple parallel jobs (what we call the build
> matrix) with a single .travis.yml configuration file:
>
> * combine a language-and-environment dependent set of configuration options to
> automatically create a matrix of all possible combinations. This is called
> matrix expansion. For example, the following configuration produces a build
> matrix that expands to 8 individual (2 * 2 * 2) jobs
> [...]
>
> * specify the exact combination of configurations you want in jobs.include.
> For example, if not all of those combinations are interesting, you can
> specify just the combinations you want
The dependency on java was introduced in 2012 (c021cf52d8) to start
Sauce-Connect from sauce labs.
Probably at the time it was a runtime dependency, but it is no longer the case
today. It is possible that java was already not needed when db003a1460 changed
from downloading Sauce-Connect-latest.zip to sc-latest-linux.tar.gz.
Moreover, I am quite sure tests/frontend/travis/sauce_tunnel.sh no longer works
today, because tests/frontend/travis/sauce_tunnel.sh downloads from an url that
gives HTTP/404 now: sc-latest-linux.tar.gz if no longer a valid file name, we
would need to explicitly download a specific version.
This plugin allows us to test code related to plugins, like testing
issues that only happen when we have plugins using line attribs, for
example (see #3118).
Pierre Prinetti