sebastianbergmann/phpunit-selenium — comment on commit 48576a4fc3c444ae19edce6fe8dd59d63ace1354
File:  line 0
By giorgiosironi:

The .travis.yml file is the only thing needed by Travis CI. Automating the steps from checking out the project to running the test suite is needed by CI.
A side effect of the submodules is allowing reproducible builds of PHPUnit_Selenium against particular versions of PHPUnit and its components.