update pytest dist value to loadgroup

This option is much faster and easier to control the group of tests for same worker.

pyproject.toml

@@ -87,8 +87,10 @@ namespaces = true # enable data directory to be identified
 
 [tool.pytest.ini_options]
 minversion = "6.0"
-# pytest options: -ra: show summary info for all test outcomes; -n auto: run tests in parallel; --dist loadscope: distribute tests by loading scope
-addopts = "-ra -n auto --dist loadscope"    
+# -ra: show summary info for all test outcomes; 
+# -n auto: run tests in parallel; 
+# --dist loadgroup: sends tests marked with 'xdist_group' to the same worker
+addopts = "-ra -n auto --dist loadgroup"    
 testpaths = ["tests/unit"]
 
 [tool.coverage.run]