Discovered via https://github.com/barryvdh/laravel-ide-helper/pull/1017#issuecomment-679318764
This only happens if you run an artisan command _before_ `runCommand`,
but since every of these tests performs migrations, using artisan,
the mocked output instance is left behind and also affected us.
The call added in `runCommand` explicitly unregisters
`\Illuminate\Console\OutputStyle` and thus also throwing away possibly
mocked versions.
* phpcs: enable also for config, resources and tests
* composer fix-style
* vendor/bin/phpunit -d --update-snapshots
* gha: instead of checking the style, fix and auto-commit it 💪
* phpunit: use dedicate `Tests` namespace for tests
* tests: replace phpunit with orchestra/testbench
* phpunit: ignore result cache file
* phpunit: adapt test for newer version
* tests: add base testcase class with a helper to run/assert commands
* tests: add test for ide-helper:eloquent
* travis: add global default variables
* travis: disable xdebug, speeds up running tests
* travis: convert php versions to build matrix for environment vars
* travis: only run phpcs/phpunit when the env vars signal it
However phpcs only runs with one test combination from the matrix,
not necessary to execute it every time.
Markus Podar
