Add pytest marks for test dependency management

- Register requires_mysql and requires_minio marks in pyproject.toml
- Add pytest_collection_modifyitems hook to auto-mark tests based on
  fixture usage
- Remove autouse=True from configure_datajoint fixture so containers
  only start when needed
- Fix test_drop_unauthorized to use connection_test fixture

Tests can now run without Docker:
  pytest -m "not requires_mysql"  # Run 192 unit tests

Full test suite still works:
  DJ_USE_EXTERNAL_CONTAINERS=1 pytest tests/  # 471 tests

Bump version to 2.0.0a9

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dimitri-yatsenko

pyproject.toml

@@ -158,7 +158,11 @@ skip = ".git,*.pdf,*.svg,*.csv,*.ipynb,*.drawio"
 # astroid -- Python library name (not "asteroid")
 ignore-words-list = "rever,numer,astroid"
 
-# pytest-env removed - testcontainers handles container lifecycle automatically
+[tool.pytest.ini_options]
+markers = [
+    "requires_mysql: marks tests as requiring MySQL database (deselect with '-m \"not requires_mysql\"')",
+    "requires_minio: marks tests as requiring MinIO object storage (deselect with '-m \"not requires_minio\"')",
+]
 
 
 [tool.pixi.workspace]

src/datajoint/version.py

@@ -1,4 +1,4 @@
 # version bump auto managed by Github Actions:
 # label_prs.yaml(prep), release.yaml(bump), post_release.yaml(edit)
 # manually set this version will be eventually overwritten by the above actions
-__version__ = "2.0.0a8"
+__version__ = "2.0.0a9"

tests/conftest.py

@@ -1,12 +1,19 @@
 """
 Pytest configuration for DataJoint tests.
 
-Containers are automatically started via testcontainers - no manual setup required.
+Tests are organized by their dependencies:
+- Unit tests: No external dependencies, run with `pytest -m "not requires_mysql"`
+- Integration tests: Require MySQL/MinIO, marked with @pytest.mark.requires_mysql
+
+Containers are automatically started via testcontainers when needed.
 Just run: pytest tests/
 
 To use external containers instead (e.g., docker-compose), set:
     DJ_USE_EXTERNAL_CONTAINERS=1
     DJ_HOST=localhost DJ_PORT=3306 S3_ENDPOINT=localhost:9000 pytest
+
+To run only unit tests (no Docker required):
+    pytest -m "not requires_mysql"
 """
 
 import logging
@@ -28,6 +35,52 @@
 logger = logging.getLogger(__name__)
 
 
+# =============================================================================
+# Pytest Hooks
+# =============================================================================
+
+
+def pytest_collection_modifyitems(config, items):
+    """Auto-mark integration tests based on their fixtures."""
+    # Tests that use these fixtures require MySQL
+    mysql_fixtures = {
+        "connection_root",
+        "connection_root_bare",
+        "connection_test",
+        "schema_any",
+        "schema_any_fresh",
+        "schema_simp",
+        "schema_adv",
+        "schema_ext",
+        "schema_uuid",
+        "schema_type_aliases",
+        "schema_obj",
+        "db_creds_root",
+        "db_creds_test",
+    }
+    # Tests that use these fixtures require MinIO
+    minio_fixtures = {
+        "minio_client",
+        "s3fs_client",
+        "s3_creds",
+        "stores_config",
+        "mock_stores",
+    }
+
+    for item in items:
+        # Get all fixtures this test uses (directly or indirectly)
+        try:
+            fixturenames = set(item.fixturenames)
+        except AttributeError:
+            continue
+
+        # Auto-add marks based on fixture usage
+        if fixturenames & mysql_fixtures:
+            item.add_marker(pytest.mark.requires_mysql)
+        if fixturenames & minio_fixtures:
+            item.add_marker(pytest.mark.requires_minio)
+
+
 # =============================================================================
 # Container Fixtures - Auto-start MySQL and MinIO via testcontainers
 # =============================================================================
@@ -177,9 +230,13 @@ def s3_creds(minio_container) -> Dict:
 # =============================================================================
 
 
-@pytest.fixture(scope="session", autouse=True)
+@pytest.fixture(scope="session")
 def configure_datajoint(db_creds_root):
-    """Configure DataJoint to use test database."""
+    """Configure DataJoint to use test database.
+
+    This fixture is NOT autouse - it only runs when a test requests
+    a fixture that depends on it (e.g., connection_root_bare).
+    """
     # Parse host:port from credentials
     host_port = db_creds_root["host"]
     if ":" in host_port:
@@ -200,7 +257,7 @@ def configure_datajoint(db_creds_root):
 
 
 @pytest.fixture(scope="session")
-def connection_root_bare(db_creds_root):
+def connection_root_bare(db_creds_root, configure_datajoint):
     """Bare root connection without user setup."""
     connection = dj.Connection(**db_creds_root)
     yield connection

tests/integration/test_schema.py

@@ -66,8 +66,10 @@ def test_schema_list(schema_any):
     assert schema_any.database in schemas
 
 
-def test_drop_unauthorized():
-    info_schema = dj.schema("information_schema")
+@pytest.mark.requires_mysql
+def test_drop_unauthorized(connection_test):
+    """Test that dropping information_schema raises AccessError."""
+    info_schema = dj.schema("information_schema", connection=connection_test)
     with pytest.raises(dj.errors.AccessError):
         info_schema.drop()