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Change PHPUnit command used in HOWTO-TESTS
We now have more than one test case, which means lots of failing
tests, whereas the HelloWorldTest case has one failing, and one
passing. This means less command line noise, so easier understanding.
Set up infrastructure for automated tests
Please note that phpunit.xml is configured so that test reports
are generated in the tests/reports directory. This is why I had
to add this directory to .gitignore. We don't want test reports
tracked by Git.