Fix special case in pylint type hint plugin (#118454)

* Fix special case in pylint type hint plugin

* Simplify

* Simplify

* Simplify

* Apply

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

---------

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

pylint/plugins/hass_enforce_type_hints.py

@@ -69,7 +69,7 @@ class ClassTypeHintMatch:
     matches: list[TypeHintMatch]
 
 
-_INNER_MATCH = r"((?:[\w\| ]+)|(?:\.{3})|(?:\w+\[.+\]))"
+_INNER_MATCH = r"((?:[\w\| ]+)|(?:\.{3})|(?:\w+\[.+\])|(?:\[\]))"
 _TYPE_HINT_MATCHERS: dict[str, re.Pattern[str]] = {
     # a_or_b matches items such as "DiscoveryInfoType | None"
     # or "dict | list | None"
@@ -2914,6 +2914,10 @@ def _is_valid_type(
     if expected_type == "...":
         return isinstance(node, nodes.Const) and node.value == Ellipsis
 
+    # Special case for an empty list, such as Callable[[], TestServer]
+    if expected_type == "[]":
+        return isinstance(node, nodes.List) and not node.elts
+
     # Special case for `xxx | yyy`
     if match := _TYPE_HINT_MATCHERS["a_or_b"].match(expected_type):
         return (

tests/pylint/test_enforce_type_hints.py

@@ -54,6 +54,7 @@ def test_regex_get_module_platform(
         ("list[dict[str, str]]", 1, ("list", "dict[str, str]")),
         ("list[dict[str, Any]]", 1, ("list", "dict[str, Any]")),
         ("tuple[bytes | None, str | None]", 2, ("tuple", "bytes | None", "str | None")),
+        ("Callable[[], TestServer]", 2, ("Callable", "[]", "TestServer")),
     ],
 )
 def test_regex_x_of_y_i(
@@ -1130,12 +1131,14 @@ def test_notify_get_service(
 def test_pytest_function(
     linter: UnittestLinter, type_hint_checker: BaseChecker
 ) -> None:
-    """Ensure valid hints are accepted for async_get_service."""
+    """Ensure valid hints are accepted for a test function."""
     func_node = astroid.extract_node(
         """
     async def test_sample( #@
         hass: HomeAssistant,
         caplog: pytest.LogCaptureFixture,
+        aiohttp_server: Callable[[], TestServer],
+        unused_tcp_port_factory: Callable[[], int],
     ) -> None:
         pass
     """,