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:
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.