TST: Add test for deprecated import path

FIX

Author: mattwthompson

openff/interchange/_tests/unit_tests/components/test_packmol.py

@@ -0,0 +1,13 @@
+"""Unit test(s) for old PACKMOL wrapper import path."""
+
+import pytest
+
+from openff.interchange.warnings import InterchangeDeprecationWarning
+
+
+def test_deprecation_warning_thrown():
+    with pytest.warns(
+        InterchangeDeprecationWarning,
+        match="openff.interchange.packmol` instead",
+    ):
+        from openff.interchange.components._packmol import UNIT_CUBE  # noqa: F401

openff/interchange/components/_packmol.py

@@ -10,6 +10,7 @@
     solvate_topology,
     solvate_topology_nonwater,
 )
+from openff.interchange.warnings import InterchangeDeprecationWarning
 
 __all__ = (
     "RHOMBIC_DODECAHEDRON",
@@ -23,5 +24,6 @@
 import warnings
 
 warnings.warn(
-    "This submodule is now part of the public API. Import from `openff.interchange.packmol instead.",
+    "This submodule is now part of the public API. Import from `openff.interchange.packmol` instead.",
+    InterchangeDeprecationWarning,
 )