fix Package.from_parent, UNTESTED

Author: RonnyPfannschmidt

src/_pytest/python.py

@@ -621,6 +621,27 @@ def _importtestmodule(self):
 
 
 class Package(Module):
+    @classmethod
+    def from_parent(
+        cls,
+        parent,
+        *,
+        name=None,
+        fs_path: Optional[Path] = None,
+        fspath: Optional[py.path.local] = None,
+        **kw,
+    ):
+        if name is None:
+            if fs_path is not None:
+                name = fs_path.parent.name
+            elif fspath is not None:
+                fs_path = Path(fspath)
+                name = fs_path.parent.name
+            else:
+                raise TypeError("name required")
+
+        return super().from_parent(parent=parent, name=name, fs_path=fs_path, **kw)
+
     def setup(self) -> None:
         # Not using fixtures to call setup_module here because autouse fixtures
         # from packages are not called automatically (#4085).