qa: lib/tests += test_mntpt

After moving WCFS mountpoint calculation to a dedicated module, we can
now test this module for correctness. It's important that different
clients which point to the same storage always result in the same
mountpoint, even if their used zodburi slightly differs (e.g. due to
different client-side parameters or different paths of encryption).

lib/tests/test_mntpt.py

+# -*- coding: utf-8 -*-
+# Copyright (C) 2023  Nexedi SA and Contributors.
+#
+# This program is free software: you can Use, Study, Modify and Redistribute
+# it under the terms of the GNU General Public License version 3, or (at your
+# option) any later version, as published by the Free Software Foundation.
+#
+# You can also Link and Combine this program with other software covered by
+# the terms of any of the Free Software licenses or any of the Open Source
+# Initiative approved licenses and Convey the resulting work. Corresponding
+# source of such a combination shall include the source code for all other
+# software used.
+#
+# This program is distributed WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See COPYING file for full licensing terms.
+# See https://www.nexedi.com/licensing for rationale and options.
+
+import pytest
+
+from wendelin.lib.mntpt import mntpt_4zurl
+
+
+@pytest.mark.parametrize(
+    "uri_tuple",
+    [
+        # FileStorage
+        ("file://Data.fs", "file://Data.fs"),
+        # ZEO
+        ("zeo://localhost:9001", "zeo://localhost:9001"),
+        # NEO
+        ("neo://127.0.0.1:1234/cluster", "neo://127.0.0.1:1234/cluster"),
+        #   > 1 master nodes \w different order
+        (
+            "neo://127.0.0.1:1234,127.0.0.2:1234/cluster",
+            "neo://127.0.0.2:1234,127.0.0.1:1234/cluster",
+        ),
+        #   Different SSL paths
+        (
+            "neos://ca=ca.cert&key=neo.key&cert=neo.cert@127.0.0.1:1234/cluster",
+            "neos://ca=a&key=b&cert=c@127.0.0.1:1234/cluster",
+        ),
+    ],
+)
+def test_stable_mntpt(uri_tuple):
+    mntpt = None
+    for uri in uri_tuple:
+        nmntpt = mntpt_4zurl(uri)
+        if mntpt is not None:
+            assert nmntpt == mntpt
+        mntpt = nmntpt
+
+
+# lib/mntpt must explicitly raise an exception if an unsupported
+# zodburi scheme is used.
+def test_mntpt_4zurl_invalid_scheme():
+    for uri in "https://test postgres://a:b@c:5432/d".split(" "):
+        with pytest.raises(NotImplementedError):
+            mntpt_4zurl(uri)