This is where we store the adapter tests that will be used by plugin repos. It should be included in the dbt-core and plugin repos via git-subrepo or by installing using pip. Changes in this plugin will be stored in a separate dbt-tests-adapter repository at https://github.com/dbt-labs/dbt-tests-adapter.
Tests in this repo will be packaged as classes, with a base class that can be imported by adapter test repositories. Tests that might need to be overridden by a plugin will be separated into separate test methods or test classes as they are discovered.
This plugin is installed in the dbt-core repo by pip install -e tests/adapter, which is included in the editable-requirements.txt file.
The dbt.tests.adapter.basic tests originally came from the earlier dbt-adapter-tests repository. Additional test directories will be added as they are converted from dbt-core integration tests, so that they can be used in adapter test suites without copying and pasting.
Documentation of git-subrepo can be found at https://github.com/ingydotnet/git-subrepo and https://github.com/ingydotnet/git-subrepo/wiki. Using git-subrepo in adapter repositories is not required.
This is packaged as a plugin using a python namespace package so it cannot have an init.py file in the part of the hierarchy to which it needs to be attached.