Improve coverage for various core modules (#10663)

tests/unit_tests/conftest.py

@@ -36,3 +36,10 @@ def fixture_path() -> Path:
     Location of all fixture files.
     """
     return here / "fixtures"
+
+
+@pytest.fixture
+def setup_core(tmp_path: Path) -> Path:
+    """Set up CORE with test paths."""
+    CORE.config_path = str(tmp_path / "test.yaml")
+    return tmp_path