Separate unit test and type check Tox jobs. Also use the --lock arg to poetry add to reduce the installation churn.

Author: hathawsh

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 min_version = 4.0
-env_list = format, lint, py{39,310,311}-pydantic{1,2}
+env_list = format, lint, py{39,310,311}-pydantic{1,2}-test, py{39,310,311}-pydantic{1,2}-type
 
 [gh-actions]
 python =
@@ -11,17 +11,17 @@ python =
 [testenv]
 labels = core
 allowlist_externals = poetry
-# The "pydanticX:" prefixes are Tox factor-conditional settings.
+# The "pydanticX:", "test:", and "type:" prefixes are Tox factor-conditional settings.
 # https://tox.wiki/en/3.4.0/config.html?highlight=conditional#factors-and-factor-conditional-settings
 # Note that "poetry add" changes pyproject.toml, but at least we
 # change it back when the tests finish.
 commands_pre =
-  pydantic1: poetry add pydantic<2
-  pydantic2: poetry add pydantic>=1.8
+  pydantic1: poetry add --lock pydantic<2
+  pydantic2: poetry add --lock pydantic>=1.8
   poetry install --no-root --all-extras
 commands =
-  poetry run pytest -vv tests
-  poetry run mypy openapi_pydantic tests
+  test: poetry run pytest -vv tests
+  type: poetry run mypy openapi_pydantic tests
 
 [testenv:format]
 allowlist_externals = poetry