Change test order to run unit tests first. (#3533)

Co-authored-by: Paul Romano <paul.k.romano@gmail.com>

Author: GuySten

openmc/cell.py

@@ -567,10 +567,10 @@ def plot(self, *args, **kwargs):
         .. versionadded:: 0.14.0
         """
         # Create dummy universe but preserve used_ids
-        next_id = openmc.Universe.next_id
+        next_id = openmc.UniverseBase.next_id
         u = openmc.Universe(cells=[self])
-        openmc.Universe.used_ids.remove(u.id)
-        openmc.Universe.next_id = next_id
+        openmc.UniverseBase.used_ids.remove(u.id)
+        openmc.UniverseBase.next_id = next_id
         return u.plot(*args, **kwargs)
 
     def create_xml_subelement(self, xml_element, memo=None):

openmc/config.py

@@ -178,7 +178,7 @@ def patch(self, key: str, value: Any):
                 self[key] = previous_value
 
 
-def _default_config() -> _Config:
+def _default_config(**kwargs) -> _Config:
     """Create a configuration initialized from environment variables.
 
     This function checks for OPENMC_CROSS_SECTIONS, OPENMC_MG_CROSS_SECTIONS,
@@ -192,11 +192,11 @@ def _default_config() -> _Config:
         A new configuration object.
 
     """
-    config = _Config()
+    config = _Config(kwargs)
     for key,var in _Config._PATH_KEYS.items():
         if var in os.environ:
             config[key] = os.environ[var]
-    
+
     chain_file = config.get("chain_file")
     xs_path = config.get("cross_sections")
     if chain_file is None and xs_path is not None and xs_path.exists():

tests/unit_tests/test_config.py

@@ -13,6 +13,7 @@ def reset_config_and_env():
     """A fixture to ensure each test has a clean config, env, and CWD."""
     original_env = dict(os.environ)
     original_cwd = os.getcwd()
+    original_resolve_paths = openmc.config["resolve_paths"]
 
     # Reset environment variables that affect config
     for key in ['OPENMC_CROSS_SECTIONS', 'OPENMC_MG_CROSS_SECTIONS', 'OPENMC_CHAIN_FILE']:
@@ -25,13 +26,13 @@ def reset_config_and_env():
     try:
         yield
     finally:
-        # Restore environment and CWD
+        # Restore environment, CWD and resolve_paths
         os.environ.clear()
         os.environ.update(original_env)
         os.chdir(original_cwd)
 
         # Restore config one last time for safety between modules
-        openmc.config = _default_config()
+        openmc.config = _default_config(resolve_paths=original_resolve_paths)
 
 
 def test_config_basics():

tools/ci/gha-script.sh

@@ -14,5 +14,5 @@ if [[ $EVENT == 'y' ]]; then
   args="${args} --event "
 fi
 
-# Run regression and unit tests
-pytest --cov=openmc -v $args tests
+# Run unit tests and then regression tests
+pytest --cov=openmc -v $args tests/unit_tests tests/regression_tests