run_sys_tests: Check that FUNITFATES dependencies are available.

Author: samsrabin

python/ctsm/path_utils.py

@@ -105,6 +105,23 @@ def add_ctsm_systests_to_path(standalone_only=False):
     sys.path.insert(1, ctsm_systest_dir)
 
 
+def add_fates_testing_to_path():
+    """Adds the FATES testing dir to the python path, to allow importing Python modules from there
+    """
+    fates_testing_path = os.path.join(
+        os.path.dirname(__file__),
+        os.pardir,
+        os.pardir,
+        "src",
+        "fates",
+        "testing",
+    )
+    if not os.path.exists(fates_testing_path):
+        raise RuntimeError(f"src_path not found: '{fates_testing_path}'")
+    prepend_to_python_path(fates_testing_path)
+    sys.path.insert(1, fates_testing_path)
+
+
 # ========================================================================
 # Private functions
 # ========================================================================

python/ctsm/run_sys_tests.py

@@ -24,7 +24,7 @@
 )
 from ctsm.machine_defaults import MACHINE_DEFAULTS
 from ctsm.os_utils import make_link
-from ctsm.path_utils import path_to_ctsm_root
+from ctsm.path_utils import path_to_ctsm_root, add_fates_testing_to_path
 from ctsm.joblauncher.job_launcher_factory import JOB_LAUNCHER_NOBATCH
 
 logger = logging.getLogger(__name__)
@@ -749,6 +749,14 @@ def _check_py_env(test_attributes):
         except ModuleNotFoundError as err:
             raise ModuleNotFoundError("modify_fsurdat" + err_msg) from err
 
+    # Check requirements for FUNITFATES, if needed
+    if any("FUNITFATES" in t for t in test_attributes):
+        add_fates_testing_to_path()
+        try:
+            import run_unit_tests
+        except ModuleNotFoundError as err:
+            raise ModuleNotFoundError("FATES run_unit_tests" + err_msg) from err
+
     # Check requirements for RXCROPMATURITY, if needed
     if any("RXCROPMATURITY" in t for t in test_attributes):
         try: