Replace failing test_invalid_subconfig subtest

test_invalid_subconfig began failing due to changes in the environment.

Test happened to verify that a validation error is thrown when all
directories on the path are unwritable.
1. this is difficult to reproduce in controlled test setup.
2. intuitively one would expect that it is enough for provided directory
to be writable, yet check is implemented to verify all directories along
the path. Reason for this is unclear.
3. it is unclear if test on purpose used a path with all directories
unwritable  or if it was an accident.

As expected behavior is unknown, create a x-failing replacement test for
behavior to be verified in the future.

Author: achaikou

tests/everest/test_everlint.py

@@ -135,10 +135,6 @@ def test_extra_key(min_config):
             {"forward_model": ["not_a_job"]},
             "unknown job not_a_job",
         ),
-        (
-            {"environment": {"simulation_folder": "/usr/bin/unwriteable"}},
-            "User does not have write access to",
-        ),
         (
             {"environment": {"output_folder": ("super long path" * 300)}},
             "output_folder\n.* File name too long",
@@ -168,6 +164,28 @@ def test_invalid_subconfig(extra_config, min_config, expected):
         EverestConfig(**min_config)
 
 
+@pytest.mark.xfail(
+    reason=(
+        "behavior must be looked at. Current code requires all directories on path"
+        "to be unwritable to raise validation error."
+    )
+)
+def test_that_simulation_folder_without_write_access_raises_validation_error(
+    min_config, tmp_path
+):
+    unwritable = tmp_path / "unwritable"
+    unwritable.mkdir()
+    original_mode = unwritable.stat().st_mode
+    unwritable.chmod(0o555)
+
+    try:
+        min_config["environment"] = {"simulation_folder": str(unwritable)}
+        with pytest.raises(ValidationError, match="User does not have write access to"):
+            EverestConfig(**min_config)
+    finally:
+        unwritable.chmod(original_mode)
+
+
 @pytest.mark.parametrize(
     ("link", "source", "target"),
     [