It will read phpunit.xml which points to the library, test path, bootstrap
strip and set other parameters.
-The database set by `UNIT_TEST_DSN` will be deleted and recreated. Not setting
-it will skip some tests as pending, but not fail the tests.
+It will use (and destroy) a local database 'nominatim_unit_tests'. You can set
+a different connection string with e.g. UNIT_TEST_DSN='pgsql:dbname=foo_unit_tests'.
BDD Functional Tests
====================