test nested importable dynamic submodules.

Author: pierreglaser

tests/cloudpickle_test.py

@@ -715,6 +715,13 @@ def test_module_importability(self):
         assert _is_importable(m)
         assert pickle_depickle(m, protocol=self.protocol) is m
 
+        # Do the same for an importable dynamic submodule inside a dynamic
+        # module inside a file-backed module.
+        import _cloudpickle_testpkg.mod.dynamic_submodule.dynamic_subsubmodule as sm  # noqa
+        assert _is_dynamic(sm)
+        assert _is_importable(sm)
+        assert pickle_depickle(sm, protocol=self.protocol) is sm
+
         expected = "cannot check importability of object instances"
         with pytest.raises(TypeError, match=expected):
             _is_importable(object())

tests/cloudpickle_testpkg/_cloudpickle_testpkg/mod.py

@@ -24,6 +24,15 @@
 dynamic_submodule = types.ModuleType(submodule_name)
 sys.modules[submodule_name] = dynamic_submodule
 
+# What about a dynamic submodule inside a dynamic submodule inside an
+# importable module?
+subsubmodule_name = (
+    '_cloudpickle_testpkg.mod.dynamic_submodule.dynamic_subsubmodule'
+)
+dynamic_subsubmodule = types.ModuleType(subsubmodule_name)
+dynamic_submodule.dynamic_subsubmodule = dynamic_subsubmodule
+sys.modules[subsubmodule_name] = dynamic_subsubmodule
+
 
 def module_function():
     return "hello from a module!"