chore: configure independent pytest settings per subpackage (#278)

* chore: configure independent pytest settings per subpackage

- Add [tool.pytest.ini_options] to each package's pyproject.toml
- Update conftest.py in each package to declare pytest_plugins directly
- Remove root-level conftest.py (no longer needed)
- Remove testpaths from root pyproject.toml

This enables running tests independently per package without relying
on root-level configuration.

* update out of date comments

Author: johnnygreco

conftest.py

@@ -48,5 +48,10 @@ packages = ["src/data_designer"]
 [tool.ruff]
 extend = "../../pyproject.toml"
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_default_fixture_loop_scope = "session"
+env = ["DISABLE_DATA_DESIGNER_PLUGINS=true"]
+
 [tool.uv]
 package = true

packages/data-designer-config/pyproject.toml

@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-# Fixtures are loaded via root conftest.py's pytest_plugins declaration
+pytest_plugins = ["data_designer.config.testing.fixtures"]

packages/data-designer-config/tests/conftest.py

@@ -58,6 +58,11 @@ packages = ["src/data_designer"]
 [tool.ruff]
 extend = "../../pyproject.toml"
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_default_fixture_loop_scope = "session"
+env = ["DISABLE_DATA_DESIGNER_PLUGINS=true"]
+
 [tool.uv]
 package = true
 

packages/data-designer-engine/pyproject.toml

@@ -3,8 +3,7 @@
 
 """Pytest fixtures for engine testing.
 
-This module is registered as a pytest plugin in the root conftest.py per pytest best practices.
-https://docs.pytest.org/en/stable/deprecations.html#pytest-plugins-in-non-top-level-conftest-files
+Located in src/ so it can be packaged and shared across subpackages via pytest_plugins.
 """
 
 from __future__ import annotations

packages/data-designer-engine/src/data_designer/engine/testing/fixtures.py

@@ -1,4 +1,7 @@
 # SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-# Fixtures are loaded via root conftest.py's pytest_plugins declaration
+pytest_plugins = [
+    "data_designer.config.testing.fixtures",
+    "data_designer.engine.testing.fixtures",
+]

packages/data-designer-engine/tests/conftest.py

@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-# Fixtures are loaded via root conftest.py's pytest_plugins declaration
+# Fixtures are loaded via pytest_plugins in this package's top-level tests/conftest.py.

packages/data-designer-engine/tests/engine/mcp/conftest.py

@@ -50,6 +50,11 @@ packages = ["src/data_designer"]
 [tool.ruff]
 extend = "../../pyproject.toml"
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_default_fixture_loop_scope = "session"
+env = ["DISABLE_DATA_DESIGNER_PLUGINS=true"]
+
 [tool.uv]
 package = true
 

packages/data-designer/pyproject.toml

@@ -1,4 +1,7 @@
 # SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-# Fixtures are loaded via root conftest.py's pytest_plugins declaration
+pytest_plugins = [
+    "data_designer.config.testing.fixtures",
+    "data_designer.engine.testing.fixtures",
+]

packages/data-designer/tests/conftest.py

@@ -68,11 +68,6 @@ recipes = [
 ]
 
 [tool.pytest.ini_options]
-testpaths = [
-    "packages/data-designer-config/tests",
-    "packages/data-designer-engine/tests",
-    "packages/data-designer/tests",
-]
 asyncio_default_fixture_loop_scope = "session"
 env = ["DISABLE_DATA_DESIGNER_PLUGINS=true"]