Use _import_module_using_spec to import parent modules

Seems this is the right thing to do, as we will then also consider the parent modules for rewriting.

Author: nicoddemus

src/_pytest/pathlib.py

@@ -641,8 +641,24 @@ def _import_module_using_spec(
         parent_module_name, _, name = module_name.rpartition(".")
         parent_module: Optional[ModuleType] = sys.modules.get(parent_module_name)
         if parent_module is None and parent_module_name:
-            with contextlib.suppress(ModuleNotFoundError, ImportWarning):
-                parent_module = importlib.import_module(parent_module_name)
+            # Find the directory of this module's parent.
+            parent_dir = (
+                module_path.parent.parent
+                if module_path.name == "__init__.py"
+                else module_path.parent
+            )
+            # Consider the parent module path as its __init__.py file, if it has one.
+            parent_module_path = (
+                parent_dir / "__init__.py"
+                if (parent_dir / "__init__.py").is_file()
+                else parent_dir
+            )
+            parent_module = _import_module_using_spec(
+                parent_module_name,
+                parent_module_path,
+                parent_dir,
+                insert_modules=insert_modules,
+            )
 
         # Find spec and import this module.
         mod = importlib.util.module_from_spec(spec)