tests/f2: allow string lists as config values

not all values are sets. the search path for example is definitely ordered.

Change-Id: Ice94fe324319731ae3a83c757768c48576ba8b36

tests/functional2/testlib/fixtures/nix.py

@@ -62,12 +62,12 @@ class NixSettings:
 
         def serialise(value: Any) -> str:
             # TODO(Commentator2.0): why exactly are ints supported?
-            if is_value_of_type(value, set[str | int]):
+            if is_value_of_type(value, set[str | int] | list[str | int]):
                 return " ".join(serialise(e) for e in value)
             if is_value_of_type(value, str | int):
                 return str(value)
 
-            msg = f"Value is unsupported in nix config: {value!r}, must bei either `str|int` or `set[str|int]`"
+            msg = f"Value is unsupported in nix config: {value!r}, must bei either `str|int` or `set[str|int]` or `list[str|int]`"
             raise ValueError(msg)
 
         def field_may(name: str, value: Any, serializer: Callable[[Any], str] = serialise):

tests/functional2/testlib/test_utils.py

@@ -11,6 +11,7 @@ def test_list_type_valid():
 
 def test_list_type_valid_multi_type():
     assert is_value_of_type([1, "a", 2], list[int | str])
+    assert is_value_of_type([1, "a", 2], set[str | int] | list[int | str])
 
 
 def test_list_type_invalid_single_fail():

tests/functional2/testlib/utils.py

@@ -120,8 +120,10 @@ def is_value_of_type(value: Any, expected_type: type[Any] | UnionType) -> bool:
     if expected_type is Any:
         return True
     match origin:
-        case None | types.UnionType:
+        case None:
             return isinstance(value, expected_type)
+        case types.UnionType:
+            return any(is_value_of_type(value, t) for t in get_args(expected_type))
         case typing.Literal:
             return value in get_args(expected_type)
         case builtins.type: