how to exclude PHPUnit based functional tests from runnning?

Question

I am trying to run only unit test for my custom module.

./vendor/bin/phpunit -c ./web/core ./web/modules/custom/testing_example --testsuite=unit .
But I keep getting the following error:

There were 2 errors: 1) Drupal\Tests\testing_example\Kernel\ExampleFixtureManagementTest::testNodeCreation Exception: There is no database connection so no tests can be run. You must provide a SIMPLETEST_DB environment variable to run PHPUnit based functional tests outside of run-tests.sh. See https://www.drupal.org/node/2116263#skipped-tests for more information.

I only want to run PhpUnit tests and not functional/browser tests.

Answer 1

Since those tests are grouped by namespace/directory, you can just pass the respective path to phpunit, simply add tests/src/Unit to your existing path.

Answer 2

To run only certain tests in phpunit, append --filter (https://phpunit.de/manual/6.5/en/textui.html) in your phpunit call whether directly in cli or in an IDE phpunit config.

To filter to only Unit tests across all modules but exclude Functional and Kernel tests, you can pass in something that matches the well-structured Drupal tests path like @Berdir was getting at like --filter Unit.

I suspect there's a more specific way to narrow it down like --filter tests/src/Unit but I didn't figure it out. I assume one can also combine filters to pick and chose among Unit and Kernel, for instance, but I also didn't play with that. :)