Some more basic testing

secure-access-token-authorizer.nix

src/_secureaccesstokenauthorizer/_plugin.py

src/_secureaccesstokenauthorizer/_storage_server.py

src/_secureaccesstokenauthorizer/tests/matchers.py

src/_secureaccesstokenauthorizer/tests/strategies.py

src/_secureaccesstokenauthorizer/tests/test_plugin.py