Fall back to synthetic test data for SSPUpdate

message_ix_models/project/ssp/data.py

@@ -1,9 +1,14 @@
+import logging
+from copy import copy
+
 from message_ix_models.tools.exo_data import (
     ExoDataSource,
     iamc_like_data_for_query,
     register_source,
 )
-from message_ix_models.util import private_data_path
+from message_ix_models.util import package_data_path, private_data_path
+
+log = logging.getLogger(__name__)
 
 
 @register_source
@@ -20,16 +25,17 @@ def __init__(self, source, source_kw):
         *parts, self.ssp_number = source.partition(s)
 
         # Map the `measure` keyword to a string appearing in the data
+        _kw = copy(source_kw)
         self.measure = {
             "GDP": "GDP|PPP",
             "POP": "Population",
-        }[source_kw.pop("measure")]
+        }[_kw.pop("measure")]
 
         # Store the model ID, if any
-        self.model = source_kw.pop("model", None)
+        self.model = _kw.pop("model", None)
 
-        if len(source_kw):
-            raise ValueError(source_kw)
+        if len(_kw):
+            raise ValueError(_kw)
 
     def __call__(self):
         # Assemble a query string
@@ -42,6 +48,8 @@ def __call__(self):
         )
 
         path = private_data_path("ssp", "SSP-Review-Phase-1.csv.gz")
-        assert path.exists(), "TODO handle the case where message_data is not insalled"
+        if not path.exists():
+            log.warning(f"Cannot find (private) path {path}; reading random data")
+            path = package_data_path("test", *path.parts[-2:])
 
         return iamc_like_data_for_query(path, query)