test: declare ops-scenario and ops-tracing test dependencies

testing/pyproject.toml

@@ -38,5 +38,11 @@ classifiers = [
 "Homepage" = "https://github.com/canonical/operator"
 "Bug Tracker" = "https://github.com/canonical/operator/issues"
 
+[dependency-groups]
+unit = [
+    "ops-tracing",
+    "pytest~=9.0",
+]
+
 [tool.hatch.build.targets.wheel]
 packages = ["src/scenario"]  # Hatch looks for 'ops_scenario' by default.

testing/tests/benchmark/test_testing.py

@@ -25,6 +25,8 @@
 import ops
 from ops import testing
 
+pytest.importorskip('pytest_benchmark')  # Provides the 'benchmark' fixture.
+
 
 @pytest.fixture
 def benchmark_charm():

testing/tests/test_e2e/conftest.py

@@ -3,6 +3,7 @@
 
 from __future__ import annotations
 
+import pathlib
 from collections.abc import Generator
 from typing import Any
 
@@ -19,8 +20,8 @@ def secrets_context(secrets_charm_meta: dict[str, Any]):
 
 
 @pytest.fixture
-def secrets_charm_meta(pytestconfig: pytest.Config) -> Generator[dict[str, Any]]:
+def secrets_charm_meta() -> Generator[dict[str, Any]]:
     """Metadata for the secret test charm."""
-    return yaml.safe_load(
-        (pytestconfig.rootpath / 'test/charms/test_secrets/charmcraft.yaml').read_text()
-    )
+    # The repository root, so the path doesn't depend on pytest's rootdir.
+    root = pathlib.Path(__file__).parents[3]
+    return yaml.safe_load((root / 'test/charms/test_secrets/charmcraft.yaml').read_text())

testing/tests/test_e2e/test_trace_data.py

@@ -3,10 +3,13 @@
 
 from __future__ import annotations
 
+import pytest
 from scenario import Context, State
 
 import ops
 
+pytest.importorskip('ops_tracing')
+
 META = {
     'name': 'traced_charm',
     'requires': {'charm-tracing': {'interface': 'tracing', 'limit': 1}},

tracing/pyproject.toml

@@ -49,7 +49,7 @@ lint = [
     "pyright~=1.1",
 ]
 unit = [
-    "ops[testing]",
+    "ops-scenario",
     "pytest~=9.0",
 ]