ansible-test - Fix various type hinting issues. (#79798)

* ansible-test - Add missing type hints.

* ansible-test - Remove redundant type hints.

* ansible-test - Fix return type annotations.

* ansible-test - Add assert, casts to assist mypy.

* ansible-test - Fix incorrect type hints.

* ansible-test - Remove no-op code.

* ansible-test - Fix incorrect types.

* ansible-test - Fix method signature mismatch.

42 files changed, 121 insertions, 134 deletions

diff --git a/test/lib/ansible_test/_internal/become.py b/test/lib/ansible_test/_internal/become.py
index cabf97e4b3..e653959afc 100644
--- a/test/lib/ansible_test/_internal/become.py
+++ b/test/lib/ansible_test/_internal/become.py
@@ -12,7 +12,7 @@ from .util import (
 class Become(metaclass=abc.ABCMeta):
     """Base class for become implementations."""
     @classmethod
-    def name(cls):
+    def name(cls) -> str:
         """The name of this plugin."""
         return cls.__name__.lower()
 
@@ -48,7 +48,7 @@ class Doas(Become):
 class DoasSudo(Doas):
     """Become using 'doas' in ansible-test and then after bootstrapping use 'sudo' for other ansible commands."""
     @classmethod
-    def name(cls):
+    def name(cls) -> str:
         """The name of this plugin."""
         return 'doas_sudo'
 
@@ -78,7 +78,7 @@ class Su(Become):
 class SuSudo(Su):
     """Become using 'su' in ansible-test and then after bootstrapping use 'sudo' for other ansible commands."""
     @classmethod
-    def name(cls):
+    def name(cls) -> str:
         """The name of this plugin."""
         return 'su_sudo'
 
diff --git a/test/lib/ansible_test/_internal/cgroup.py b/test/lib/ansible_test/_internal/cgroup.py
index b55d878dc3..977e359d63 100644
--- a/test/lib/ansible_test/_internal/cgroup.py
+++ b/test/lib/ansible_test/_internal/cgroup.py
@@ -29,7 +29,7 @@ class CGroupEntry:
     path: pathlib.PurePosixPath
 
     @property
-    def root_path(self):
+    def root_path(self) -> pathlib.PurePosixPath:
         """The root path for this cgroup subsystem."""
         return pathlib.PurePosixPath(CGroupPath.ROOT, self.subsystem)
 
diff --git a/test/lib/ansible_test/_internal/ci/__init__.py b/test/lib/ansible_test/_internal/ci/__init__.py
index 677fafce3e..97e41dae76 100644
--- a/test/lib/ansible_test/_internal/ci/__init__.py
+++ b/test/lib/ansible_test/_internal/ci/__init__.py
@@ -152,6 +152,8 @@ class CryptographyAuthHelper(AuthHelper, metaclass=abc.ABCMeta):
         private_key_pem = self.initialize_private_key()
         private_key = load_pem_private_key(to_bytes(private_key_pem), None, default_backend())
 
+        assert isinstance(private_key, ec.EllipticCurvePrivateKey)
+
         signature_raw_bytes = private_key.sign(payload_bytes, ec.ECDSA(hashes.SHA256()))
 
         return signature_raw_bytes
diff --git a/test/lib/ansible_test/_internal/ci/azp.py b/test/lib/ansible_test/_internal/ci/azp.py
index 557fbacb31..9170dfecc8 100644
--- a/test/lib/ansible_test/_internal/ci/azp.py
+++ b/test/lib/ansible_test/_internal/ci/azp.py
@@ -40,7 +40,7 @@ CODE = 'azp'
 
 class AzurePipelines(CIProvider):
     """CI provider implementation for Azure Pipelines."""
-    def __init__(self):
+    def __init__(self) -> None:
         self.auth = AzurePipelinesAuthHelper()
 
     @staticmethod
diff --git a/test/lib/ansible_test/_internal/classification/python.py b/test/lib/ansible_test/_internal/classification/python.py
index df888738b6..77ffeacfa5 100644
--- a/test/lib/ansible_test/_internal/classification/python.py
+++ b/test/lib/ansible_test/_internal/classification/python.py
@@ -146,10 +146,8 @@ def get_python_module_utils_name(path: str) -> str:
     return name
 
 
-def enumerate_module_utils():
-    """Return a list of available module_utils imports.
-    :rtype: set[str]
-    """
+def enumerate_module_utils() -> set[str]:
+    """Return a list of available module_utils imports."""
     module_utils = []
 
     for path in data_context().content.walk_files(data_context().content.module_utils_path):
diff --git a/test/lib/ansible_test/_internal/cli/argparsing/__init__.py b/test/lib/ansible_test/_internal/cli/argparsing/__init__.py
index 9356442d0d..d1541f00d5 100644
--- a/test/lib/ansible_test/_internal/cli/argparsing/__init__.py
+++ b/test/lib/ansible_test/_internal/cli/argparsing/__init__.py
@@ -34,7 +34,7 @@ class RegisteredCompletionFinder(OptionCompletionFinder):
     These registered completions, if provided, are used to filter the final completion results.
     This works around a known bug: https://github.com/kislyuk/argcomplete/issues/221
     """
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
         self.registered_completions: t.Optional[list[str]] = None
diff --git a/test/lib/ansible_test/_internal/cli/argparsing/argcompletion.py b/test/lib/ansible_test/_internal/cli/argparsing/argcompletion.py
index df19b3382d..cf5776da3f 100644
--- a/test/lib/ansible_test/_internal/cli/argparsing/argcompletion.py
+++ b/test/lib/ansible_test/_internal/cli/argparsing/argcompletion.py
@@ -9,7 +9,7 @@ import typing as t
 
 class Substitute:
     """Substitute for missing class which accepts all arguments."""
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         pass
 
 
@@ -87,7 +87,7 @@ class OptionCompletionFinder(CompletionFinder):
     """
     enabled = bool(argcomplete)
 
-    def __init__(self, *args, validator=None, **kwargs):
+    def __init__(self, *args, validator=None, **kwargs) -> None:
         if validator:
             raise ValueError()
 
diff --git a/test/lib/ansible_test/_internal/cli/argparsing/parsers.py b/test/lib/ansible_test/_internal/cli/argparsing/parsers.py
index 429b9c0cdf..d07e03cbc8 100644
--- a/test/lib/ansible_test/_internal/cli/argparsing/parsers.py
+++ b/test/lib/ansible_test/_internal/cli/argparsing/parsers.py
@@ -341,7 +341,7 @@ class IntegerParser(DynamicChoicesParser):
 
 class BooleanParser(ChoicesParser):
     """Composite argument parser for boolean (yes/no) values."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__(['yes', 'no'])
 
     def parse(self, state: ParserState) -> bool:
diff --git a/test/lib/ansible_test/_internal/cli/compat.py b/test/lib/ansible_test/_internal/cli/compat.py
index c69b54d7d5..4fdad4ba2e 100644
--- a/test/lib/ansible_test/_internal/cli/compat.py
+++ b/test/lib/ansible_test/_internal/cli/compat.py
@@ -84,25 +84,25 @@ def get_option_name(name: str) -> str:
 
 class PythonVersionUnsupportedError(ApplicationError):
     """A Python version was requested for a context which does not support that version."""
-    def __init__(self, context, version, versions):
+    def __init__(self, context: str, version: str, versions: c.Iterable[str]) -> None:
         super().__init__(f'Python {version} is not supported by environment `{context}`. Supported Python version(s) are: {", ".join(versions)}')
 
 
 class PythonVersionUnspecifiedError(ApplicationError):
     """A Python version was not specified for a context which is unknown, thus the Python version is unknown."""
-    def __init__(self, context):
+    def __init__(self, context: str) -> None:
         super().__init__(f'A Python version was not specified for environment `{context}`. Use the `--python` option to specify a Python version.')
 
 
 class ControllerNotSupportedError(ApplicationError):
     """Option(s) were specified which do not provide support for the controller and would be ignored because they are irrelevant for the target."""
-    def __init__(self, context):
+    def __init__(self, context: str) -> None:
         super().__init__(f'Environment `{context}` does not provide a Python version supported by the controller.')
 
 
 class OptionsConflictError(ApplicationError):
     """Option(s) were specified which conflict with other options."""
-    def __init__(self, first, second):
+    def __init__(self, first: c.Iterable[str], second: c.Iterable[str]) -> None:
         super().__init__(f'Options `{" ".join(first)}` cannot be combined with options `{" ".join(second)}`.')
 
 
@@ -170,22 +170,22 @@ class TargetMode(enum.Enum):
     NO_TARGETS = enum.auto()  # coverage
 
     @property
-    def one_host(self):
+    def one_host(self) -> bool:
         """Return True if only one host (the controller) should be used, otherwise return False."""
         return self in (TargetMode.SANITY, TargetMode.UNITS, TargetMode.NO_TARGETS)
 
     @property
-    def no_fallback(self):
+    def no_fallback(self) -> bool:
         """Return True if no fallback is acceptable for the controller (due to options not applying to the target), otherwise return False."""
         return self in (TargetMode.WINDOWS_INTEGRATION, TargetMode.NETWORK_INTEGRATION, TargetMode.NO_TARGETS)
 
     @property
-    def multiple_pythons(self):
+    def multiple_pythons(self) -> bool:
         """Return True if multiple Python versions are allowed, otherwise False."""
         return self in (TargetMode.SANITY, TargetMode.UNITS)
 
     @property
-    def has_python(self):
+    def has_python(self) -> bool:
         """Return True if this mode uses Python, otherwise False."""
         return self in (TargetMode.POSIX_INTEGRATION, TargetMode.SANITY, TargetMode.UNITS, TargetMode.SHELL)
 
diff --git a/test/lib/ansible_test/_internal/cli/parsers/base_argument_parsers.py b/test/lib/ansible_test/_internal/cli/parsers/base_argument_parsers.py
index ed933bd535..aac7a69468 100644
--- a/test/lib/ansible_test/_internal/cli/parsers/base_argument_parsers.py
+++ b/test/lib/ansible_test/_internal/cli/parsers/base_argument_parsers.py
@@ -69,5 +69,5 @@ class TargetsNamespaceParser(NamespaceParser, metaclass=abc.ABCMeta):
 
 class ControllerRequiredFirstError(CompletionError):
     """Exception raised when controller and target options are specified out-of-order."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__('The `--controller` option must be specified before `--target` option(s).')
diff --git a/test/lib/ansible_test/_internal/cli/parsers/key_value_parsers.py b/test/lib/ansible_test/_internal/cli/parsers/key_value_parsers.py
index a6af7f803e..049b71ee4c 100644
--- a/test/lib/ansible_test/_internal/cli/parsers/key_value_parsers.py
+++ b/test/lib/ansible_test/_internal/cli/parsers/key_value_parsers.py
@@ -99,7 +99,7 @@ class ControllerKeyValueParser(KeyValueParser):
 
 class DockerKeyValueParser(KeyValueParser):
     """Composite argument parser for docker key/value pairs."""
-    def __init__(self, image, controller):
+    def __init__(self, image: str, controller: bool) -> None:
         self.controller = controller
         self.versions = get_docker_pythons(image, controller, False)
         self.allow_default = bool(get_docker_pythons(image, controller, True))
@@ -135,7 +135,7 @@ class DockerKeyValueParser(KeyValueParser):
 
 class PosixRemoteKeyValueParser(KeyValueParser):
     """Composite argument parser for POSIX remote key/value pairs."""
-    def __init__(self, name, controller):
+    def __init__(self, name: str, controller: bool) -> None:
         self.controller = controller
         self.versions = get_remote_pythons(name, controller, False)
         self.allow_default = bool(get_remote_pythons(name, controller, True))
diff --git a/test/lib/ansible_test/_internal/commands/coverage/__init__.py b/test/lib/ansible_test/_internal/commands/coverage/__init__.py
index 6b063cf65d..5e56433f30 100644
--- a/test/lib/ansible_test/_internal/commands/coverage/__init__.py
+++ b/test/lib/ansible_test/_internal/commands/coverage/__init__.py
@@ -227,7 +227,7 @@ def read_python_coverage_legacy(path: str) -> PythonArcs:
         contents = read_text_file(path)
         contents = re.sub(r'''^!coverage.py: This is a private format, don't read it directly!''', '', contents)
         data = json.loads(contents)
-        arcs: PythonArcs = {filename: [tuple(arc) for arc in arcs] for filename, arcs in data['arcs'].items()}
+        arcs: PythonArcs = {filename: [t.cast(tuple[int, int], tuple(arc)) for arc in arc_list] for filename, arc_list in data['arcs'].items()}
     except Exception as ex:
         raise CoverageError(path, f'Error reading JSON coverage file: {ex}') from ex
 
diff --git a/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/__init__.py b/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/__init__.py
index f16f7b4f0f..2dcb4e847e 100644
--- a/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/__init__.py
+++ b/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/__init__.py
@@ -20,6 +20,7 @@ from .. import (
 )
 
 TargetKey = t.TypeVar('TargetKey', int, tuple[int, int])
+TFlexKey = t.TypeVar('TFlexKey', int, tuple[int, int], str)
 NamedPoints = dict[str, dict[TargetKey, set[str]]]
 IndexedPoints = dict[str, dict[TargetKey, set[int]]]
 Arcs = dict[str, dict[tuple[int, int], set[int]]]
@@ -120,10 +121,10 @@ def get_target_index(name: str, target_indexes: TargetIndexes) -> int:
 def expand_indexes(
         source_data: IndexedPoints,
         source_index: list[str],
-        format_func: c.Callable[[TargetKey], str],
-) -> NamedPoints:
+        format_func: c.Callable[[TargetKey], TFlexKey],
+) -> dict[str, dict[TFlexKey, set[str]]]:
     """Expand indexes from the source into target names for easier processing of the data (arcs or lines)."""
-    combined_data: dict[str, dict[t.Any, set[str]]] = {}
+    combined_data: dict[str, dict[TFlexKey, set[str]]] = {}
 
     for covered_path, covered_points in source_data.items():
         combined_points = combined_data.setdefault(covered_path, {})
diff --git a/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/filter.py b/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/filter.py
index f1d8551ae0..c305304a9c 100644
--- a/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/filter.py
+++ b/test/lib/ansible_test/_internal/commands/coverage/analyze/targets/filter.py
@@ -24,6 +24,7 @@ from . import (
 
 from . import (
     NamedPoints,
+    TargetKey,
     TargetIndexes,
 )
 
@@ -50,8 +51,12 @@ def command_coverage_analyze_targets_filter(args: CoverageAnalyzeTargetsFilterCo
 
     covered_targets, covered_path_arcs, covered_path_lines = read_report(args.input_file)
 
-    filtered_path_arcs = expand_indexes(covered_path_arcs, covered_targets, lambda v: v)
-    filtered_path_lines = expand_indexes(covered_path_lines, covered_targets, lambda v: v)
+    def pass_target_key(value: TargetKey) -> TargetKey:
+        """Return the given target key unmodified."""
+        return value
+
+    filtered_path_arcs = expand_indexes(covered_path_arcs, covered_targets, pass_target_key)
+    filtered_path_lines = expand_indexes(covered_path_lines, covered_targets, pass_target_key)
 
     include_targets = set(args.include_targets) if args.include_targets else None
     exclude_targets = set(args.exclude_targets) if args.exclude_targets else None
@@ -59,7 +64,7 @@ def command_coverage_analyze_targets_filter(args: CoverageAnalyzeTargetsFilterCo
     include_path = re.compile(args.include_path) if args.include_path else None
     exclude_path = re.compile(args.exclude_path) if args.exclude_path else None
 
-    def path_filter_func(path):
+    def path_filter_func(path: str) -> bool:
         """Return True if the given path should be included, otherwise return False."""
         if include_path and not re.search(include_path, path):
             return False
@@ -69,7 +74,7 @@ def command_coverage_analyze_targets_filter(args: CoverageAnalyzeTargetsFilterCo
 
         return True
 
-    def target_filter_func(targets):
+    def target_filter_func(targets: set[str]) -> set[str]:
         """Filter the given targets and return the result based on the defined includes and excludes."""
         if include_targets:
             targets &= include_targets
diff --git a/test/lib/ansible_test/_internal/commands/coverage/combine.py b/test/lib/ansible_test/_internal/commands/coverage/combine.py
index cb086fd5c3..fc4e37f8af 100644
--- a/test/lib/ansible_test/_internal/commands/coverage/combine.py
+++ b/test/lib/ansible_test/_internal/commands/coverage/combine.py
@@ -101,7 +101,7 @@ def combine_coverage_files(args: CoverageCombineConfig, host_state: HostState) -
 
 class ExportedCoverageDataNotFound(ApplicationError):
     """Exception when no combined coverage data is present yet is required."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__(
             'Coverage data must be exported before processing with the `--docker` or `--remote` option.\n'
             'Export coverage with `ansible-test coverage combine` using the `--export` option.\n'
diff --git a/test/lib/ansible_test/_internal/commands/integration/__init__.py b/test/lib/ansible_test/_internal/commands/integration/__init__.py
index 33bd45f6a0..4cad715e94 100644
--- a/test/lib/ansible_test/_internal/commands/integration/__init__.py
+++ b/test/lib/ansible_test/_internal/commands/integration/__init__.py
@@ -819,7 +819,7 @@ def integration_environment(
 
 class IntegrationEnvironment:
     """Details about the integration environment."""
-    def __init__(self, test_dir, integration_dir, targets_dir, inventory_path, ansible_config, vars_file):
+    def __init__(self, test_dir: str, integration_dir: str, targets_dir: str, inventory_path: str, ansible_config: str, vars_file: str) -> None:
         self.test_dir = test_dir
         self.integration_dir = integration_dir
         self.targets_dir = targets_dir
@@ -831,17 +831,13 @@ class IntegrationEnvironment:
 class IntegrationCache(CommonCache):
     """Integration cache."""
     @property
-    def integration_targets(self):
-        """
-        :rtype: list[IntegrationTarget]
-        """
+    def integration_targets(self) -> list[IntegrationTarget]:
+        """The list of integration test targets."""
         return self.get('integration_targets', lambda: list(walk_integration_targets()))
 
     @property
-    def dependency_map(self):
-        """
-        :rtype: dict[str, set[IntegrationTarget]]
-        """
+    def dependency_map(self) -> dict[str, set[IntegrationTarget]]:
+        """The dependency map of integration test targets."""
         return self.get('dependency_map', lambda: generate_dependency_map(self.integration_targets))
 
 
diff --git a/test/lib/ansible_test/_internal/commands/integration/cloud/cs.py b/test/lib/ansible_test/_internal/commands/integration/cloud/cs.py
index 25a02ff5b0..ca454503e4 100644
--- a/test/lib/ansible_test/_internal/commands/integration/cloud/cs.py
+++ b/test/lib/ansible_test/_internal/commands/integration/cloud/cs.py
@@ -131,7 +131,7 @@ class CsCloudProvider(CloudProvider):
 
     def _get_credentials(self, container_name: str) -> dict[str, t.Any]:
         """Wait for the CloudStack simulator to return credentials."""
-        def check(value):
+        def check(value) -> bool:
             """Return True if the given configuration is valid JSON, otherwise return False."""
             # noinspection PyBroadException
             try:
diff --git a/test/lib/ansible_test/_internal/commands/integration/coverage.py b/test/lib/ansible_test/_internal/commands/integration/coverage.py
index e9917692b1..5a486e93b8 100644
--- a/test/lib/ansible_test/_internal/commands/integration/coverage.py
+++ b/test/lib/ansible_test/_internal/commands/integration/coverage.py
@@ -158,7 +158,7 @@ class PosixCoverageHandler(CoverageHandler[PosixConfig]):
         self.teardown_controller()
         self.teardown_target()
 
-    def setup_controller(self):
+    def setup_controller(self) -> None:
         """Perform setup for code coverage on the controller."""
         coverage_config_path = os.path.join(self.common_temp_path, COVERAGE_CONFIG_NAME)
         coverage_output_path = os.path.join(self.common_temp_path, ResultType.COVERAGE.name)
@@ -171,7 +171,7 @@ class PosixCoverageHandler(CoverageHandler[PosixConfig]):
         os.mkdir(coverage_output_path)
         verified_chmod(coverage_output_path, MODE_DIRECTORY_WRITE)
 
-    def setup_target(self):
+    def setup_target(self) -> None:
         """Perform setup for code coverage on the target."""
         if not self.target_profile:
             return
diff --git a/test/lib/ansible_test/_internal/commands/sanity/__init__.py b/test/lib/ansible_test/_internal/commands/sanity/__init__.py
index cde3060397..1b062fef32 100644
--- a/test/lib/ansible_test/_internal/commands/sanity/__init__.py
+++ b/test/lib/ansible_test/_internal/commands/sanity/__init__.py
@@ -831,7 +831,7 @@ class SanitySingleVersion(SanityTest, metaclass=abc.ABCMeta):
 
 class SanityCodeSmellTest(SanitySingleVersion):
     """Sanity test script."""
-    def __init__(self, path):
+    def __init__(self, path) -> None:
         name = os.path.splitext(os.path.basename(path))[0]
         config_path = os.path.splitext(path)[0] + '.json'
 
@@ -866,10 +866,10 @@ class SanityCodeSmellTest(SanitySingleVersion):
             self.extensions = []
             self.prefixes = []
             self.files = []
-            self.text: t.Optional[bool] = None
+            self.text = None
             self.ignore_self = False
-            self.minimum_python_version: t.Optional[str] = None
-            self.maximum_python_version: t.Optional[str] = None
+            self.minimum_python_version = None
+            self.maximum_python_version = None
 
             self.__all_targets = False
             self.__no_targets = True
diff --git a/test/lib/ansible_test/_internal/commands/sanity/integration_aliases.py b/test/lib/ansible_test/_internal/commands/sanity/integration_aliases.py
index 5811dedd24..3fcab1c763 100644
--- a/test/lib/ansible_test/_internal/commands/sanity/integration_aliases.py
+++ b/test/lib/ansible_test/_internal/commands/sanity/integration_aliases.py
@@ -104,7 +104,7 @@ class IntegrationAliasesTest(SanitySingleVersion):
 
     ansible_only = True
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
 
         self._ci_config: dict[str, t.Any] = {}
@@ -307,10 +307,8 @@ class IntegrationAliasesTest(SanitySingleVersion):
 
         return messages
 
-    def check_windows_targets(self):
-        """
-        :rtype: list[SanityMessage]
-        """
+    def check_windows_targets(self) -> list[SanityMessage]:
+        """Check Windows integration test targets and return messages with any issues found."""
         windows_targets = tuple(walk_windows_integration_targets())
 
         messages = []
diff --git a/test/lib/ansible_test/_internal/commands/sanity/pylint.py b/test/lib/ansible_test/_internal/commands/sanity/pylint.py
index cd5a83506a..4db8d7f0c6 100644
--- a/test/lib/ansible_test/_internal/commands/sanity/pylint.py
+++ b/test/lib/ansible_test/_internal/commands/sanity/pylint.py
@@ -58,7 +58,7 @@ from ...host_configs import (
 
 class PylintTest(SanitySingleVersion):
     """Sanity test using pylint."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.optional_error_codes.update([
             'ansible-deprecated-date',
diff --git a/test/lib/ansible_test/_internal/commands/sanity/validate_modules.py b/test/lib/ansible_test/_internal/commands/sanity/validate_modules.py
index 2caa803e33..ddb31b5988 100644
--- a/test/lib/ansible_test/_internal/commands/sanity/validate_modules.py
+++ b/test/lib/ansible_test/_internal/commands/sanity/validate_modules.py
@@ -60,7 +60,7 @@ from ...host_configs import (
 class ValidateModulesTest(SanitySingleVersion):
     """Sanity test using validate-modules."""
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
 
         self.optional_error_codes.update([
diff --git a/test/lib/ansible_test/_internal/completion.py b/test/lib/ansible_test/_internal/completion.py
index ee096772fa..2df5a67627 100644
--- a/test/lib/ansible_test/_internal/completion.py
+++ b/test/lib/ansible_test/_internal/completion.py
@@ -54,7 +54,7 @@ class CompletionConfig(metaclass=abc.ABCMeta):
 
     @property
     @abc.abstractmethod
-    def is_default(self):
+    def is_default(self) -> bool:
         """True if the completion entry is only used for defaults, otherwise False."""
 
 
@@ -107,17 +107,17 @@ class RemoteCompletionConfig(CompletionConfig):
     arch: t.Optional[str] = None
 
     @property
-    def platform(self):
+    def platform(self) -> str:
         """The name of the platform."""
         return self.name.partition('/')[0]
 
     @property
-    def version(self):
+    def version(self) -> str:
         """The version of the platform."""
         return self.name.partition('/')[2]
 
     @property
-    def is_default(self):
+    def is_default(self) -> bool:
         """True if the completion entry is only used for defaults, otherwise False."""
         return not self.version
 
@@ -166,7 +166,7 @@ class DockerCompletionConfig(PythonCompletionConfig):
     placeholder: bool = False
 
     @property
-    def is_default(self):
+    def is_default(self) -> bool:
         """True if the completion entry is only used for defaults, otherwise False."""
         return False
 
@@ -276,7 +276,9 @@ def filter_completion(
 ) -> dict[str, TCompletionConfig]:
     """Return the given completion dictionary, filtering out configs which do not support the controller if controller_only is specified."""
     if controller_only:
-        completion = {name: config for name, config in completion.items() if isinstance(config, PosixCompletionConfig) and config.controller_supported}
+        # The cast is needed because mypy gets confused here and forgets that completion values are TCompletionConfig.
+        completion = {name: t.cast(TCompletionConfig, config) for name, config in completion.items() if
+                      isinstance(config, PosixCompletionConfig) and config.controller_supported}
 
     if not include_defaults:
         completion = {name: config for name, config in completion.items() if not config.is_default}
diff --git a/test/lib/ansible_test/_internal/containers.py b/test/lib/ansible_test/_internal/containers.py
index de4a380c47..fad1f48ad6 100644
--- a/test/lib/ansible_test/_internal/containers.py
+++ b/test/lib/ansible_test/_internal/containers.py
@@ -844,12 +844,12 @@ def create_container_hooks(
         control_state: dict[str, tuple[list[str], list[SshProcess]]] = {}
         managed_state: dict[str, tuple[list[str], list[SshProcess]]] = {}
 
-        def pre_target(target):
+        def pre_target(target: IntegrationTarget) -> None:
             """Configure hosts for SSH port forwarding required by the specified target."""
             forward_ssh_ports(args, control_connections, '%s_hosts_prepare.yml' % control_type, control_state, target, HostType.control, control_contexts)
             forward_ssh_ports(args, managed_connections, '%s_hosts_prepare.yml' % managed_type, managed_state, target, HostType.managed, managed_contexts)
 
-        def post_target(target):
+        def post_target(target: IntegrationTarget) -> None:
             """Clean up previously configured SSH port forwarding which was required by the specified target."""
             cleanup_ssh_ports(args, control_connections, '%s_hosts_restore.yml' % control_type, control_state, target, HostType.control)
             cleanup_ssh_ports(args, managed_connections, '%s_hosts_restore.yml' % managed_type, managed_state, target, HostType.managed)
diff --git a/test/lib/ansible_test/_internal/core_ci.py b/test/lib/ansible_test/_internal/core_ci.py
index 15898ef8bf..26e141655e 100644
--- a/test/lib/ansible_test/_internal/core_ci.py
+++ b/test/lib/ansible_test/_internal/core_ci.py
@@ -173,11 +173,11 @@ class AnsibleCoreCI:
             self.endpoint = self.default_endpoint
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return True if Ansible Core CI is supported."""
         return self.ci_provider.supports_core_ci_auth()
 
-    def start(self):
+    def start(self) -> t.Optional[dict[str, t.Any]]:
         """Start instance."""
         if self.started:
             display.info(f'Skipping started {self.label} instance.', verbosity=1)
@@ -185,7 +185,7 @@ class AnsibleCoreCI:
 
         return self._start(self.ci_provider.prepare_core_ci_auth())
 
-    def stop(self):
+    def stop(self) -> None:
         """Stop instance."""
         if not self.started:
             display.info(f'Skipping invalid {self.label} instance.', verbosity=1)
@@ -279,10 +279,10 @@ class AnsibleCoreCI:
         raise ApplicationError(f'Timeout waiting for {self.label} instance.')
 
     @property
-    def _uri(self):
+    def _uri(self) -> str:
         return f'{self.endpoint}/{self.stage}/{self.provider}/{self.instance_id}'
 
-    def _start(self, auth):
+    def _start(self, auth) -> dict[str, t.Any]:
         """Start instance."""
         display.info(f'Initializing new {self.label} instance using: {self._uri}', verbosity=1)
 
@@ -341,7 +341,7 @@ class AnsibleCoreCI:
             display.warning(f'{error}. Trying again after {sleep} seconds.')
             time.sleep(sleep)
 
-    def _clear(self):
+    def _clear(self) -> None:
         """Clear instance information."""
         try:
             self.connection = None
@@ -349,7 +349,7 @@ class AnsibleCoreCI:
         except FileNotFoundError:
             pass
 
-    def _load(self):
+    def _load(self) -> bool:
         """Load instance information."""
         try:
             data = read_text_file(self.path)
diff --git a/test/lib/ansible_test/_internal/data.py b/test/lib/ansible_test/_internal/data.py
index 66e21543c1..635b0c328c 100644
--- a/test/lib/ansible_test/_internal/data.py
+++ b/test/lib/ansible_test/_internal/data.py
@@ -52,7 +52,7 @@ from .provider.layout.unsupported import (
 
 class DataContext:
     """Data context providing details about the current execution environment for ansible-test."""
-    def __init__(self):
+    def __init__(self) -> None:
         content_path = os.environ.get('ANSIBLE_TEST_CONTENT_ROOT')
         current_path = os.getcwd()
 
@@ -245,7 +245,7 @@ class PluginInfo:
 
 
 @cache
-def content_plugins():
+def content_plugins() -> dict[str, dict[str, PluginInfo]]:
     """
     Analyze content.
     The primary purpose of this analysis is to facilitate mapping of integration tests to the plugin(s) they are intended to test.
@@ -256,7 +256,7 @@ def content_plugins():
         plugin_paths = sorted(data_context().content.walk_files(plugin_directory))
         plugin_directory_offset = len(plugin_directory.split(os.path.sep))
 
-        plugin_files = {}
+        plugin_files: dict[str, list[str]] = {}
 
         for plugin_path in plugin_paths:
             plugin_filename = os.path.basename(plugin_path)
diff --git a/test/lib/ansible_test/_internal/delegation.py b/test/lib/ansible_test/_internal/delegation.py
index 8c6879d213..e5f889ab57 100644
--- a/test/lib/ansible_test/_internal/delegation.py
+++ b/test/lib/ansible_test/_internal/delegation.py
@@ -226,7 +226,7 @@ def delegate_command(args: EnvironmentConfig, host_state: HostState, exclude: li
                     target.on_target_failure()  # when the controller is delegated, report failures after delegation fails
 
 
-def insert_options(command, options):
+def insert_options(command: list[str], options: list[str]) -> list[str]:
     """Insert addition command line options into the given command and return the result."""
     result = []
 
diff --git a/test/lib/ansible_test/_internal/dev/container_probe.py b/test/lib/ansible_test/_internal/dev/container_probe.py
index 84b88f4bb6..be22e01c60 100644
--- a/test/lib/ansible_test/_internal/dev/container_probe.py
+++ b/test/lib/ansible_test/_internal/dev/container_probe.py
@@ -184,7 +184,7 @@ def check_container_cgroup_status(args: EnvironmentConfig, config: DockerConfig,
         write_text_file(os.path.join(args.dev_probe_cgroups, f'{identity}.log'), message)
 
 
-def get_identity(args: EnvironmentConfig, config: DockerConfig, container_name: str):
+def get_identity(args: EnvironmentConfig, config: DockerConfig, container_name: str) -> str:
     """Generate and return an identity string to use when logging test results."""
     engine = require_docker().command
 
diff --git a/test/lib/ansible_test/_internal/docker_util.py b/test/lib/ansible_test/_internal/docker_util.py
index 77cdd4ee0f..8bea430047 100644
--- a/test/lib/ansible_test/_internal/docker_util.py
+++ b/test/lib/ansible_test/_internal/docker_util.py
@@ -720,7 +720,7 @@ class DockerError(Exception):
 
 class ContainerNotFoundError(DockerError):
     """The container identified by `identifier` was not found."""
-    def __init__(self, identifier):
+    def __init__(self, identifier: str) -> None:
         super().__init__('The container "%s" was not found.' % identifier)
 
         self.identifier = identifier
diff --git a/test/lib/ansible_test/_internal/executor.py b/test/lib/ansible_test/_internal/executor.py
index b079df9f56..0c94cf3ba9 100644
--- a/test/lib/ansible_test/_internal/executor.py
+++ b/test/lib/ansible_test/_internal/executor.py
@@ -81,13 +81,13 @@ def detect_changes(args: TestConfig) -> t.Optional[list[str]]:
 
 class NoChangesDetected(ApplicationWarning):
     """Exception when change detection was performed, but no changes were found."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__('No changes detected.')
 
 
 class NoTestsForChanges(ApplicationWarning):
     """Exception when changes detected, but no tests trigger as a result."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__('No tests found for detected changes.')
 
 
@@ -111,5 +111,5 @@ class ListTargets(Exception):
 
 class AllTargetsSkipped(ApplicationWarning):
     """All targets skipped."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__('All targets skipped.')
diff --git a/test/lib/ansible_test/_internal/host_configs.py b/test/lib/ansible_test/_internal/host_configs.py
index d7671c7f1f..48d5fd31a0 100644
--- a/test/lib/ansible_test/_internal/host_configs.py
+++ b/test/lib/ansible_test/_internal/host_configs.py
@@ -48,7 +48,7 @@ from .util import (
 @dataclasses.dataclass(frozen=True)
 class OriginCompletionConfig(PosixCompletionConfig):
     """Pseudo completion config for the origin."""
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__(name='origin')
 
     @property
@@ -65,7 +65,7 @@ class OriginCompletionConfig(PosixCompletionConfig):
         return version
 
     @property
-    def is_default(self):
+    def is_default(self) -> bool:
         """True if the completion entry is only used for defaults, otherwise False."""
         return False
 
@@ -513,7 +513,7 @@ class HostSettings:
         with open_binary_file(path) as settings_file:
             return pickle.load(settings_file)
 
-    def apply_defaults(self):
+    def apply_defaults(self) -> None:
         """Apply defaults to the host settings."""
         context = HostContext(controller_config=None)
         self.controller.apply_defaults(context, self.controller.get_defaults(context))
diff --git a/test/lib/ansible_test/_internal/host_profiles.py b/test/lib/ansible_test/_internal/host_profiles.py
index 6575e7c1ca..3cb0c6acac 100644
--- a/test/lib/ansible_test/_internal/host_profiles.py
+++ b/test/lib/ansible_test/_internal/host_profiles.py
@@ -351,7 +351,7 @@ class RemoteProfile(SshTargetHostProfile[TRemoteConfig], metaclass=abc.ABCMeta):
 
         return self.core_ci
 
-    def delete_instance(self):
+    def delete_instance(self) -> None:
         """Delete the AnsibleCoreCI VM instance."""
         core_ci = self.get_instance()
 
@@ -892,7 +892,7 @@ class DockerProfile(ControllerHostProfile[DockerConfig], SshTargetHostProfile[Do
 
         return message
 
-    def check_cgroup_requirements(self):
+    def check_cgroup_requirements(self) -> None:
         """Check cgroup requirements for the container."""
         cgroup_version = get_docker_info(self.args).cgroup_version
 
diff --git a/test/lib/ansible_test/_internal/io.py b/test/lib/ansible_test/_internal/io.py
index 41f2ec03df..80d4769931 100644
--- a/test/lib/ansible_test/_internal/io.py
+++ b/test/lib/ansible_test/_internal/io.py
@@ -80,7 +80,7 @@ def open_binary_file(path: str, mode: str = 'rb') -> t.IO[bytes]:
 
 class SortedSetEncoder(json.JSONEncoder):
     """Encode sets as sorted lists."""
-    def default(self, o):
+    def default(self, o: t.Any) -> t.Any:
         """Return a serialized version of the `o` object."""
         if isinstance(o, set):
             return sorted(o)
diff --git a/test/lib/ansible_test/_internal/metadata.py b/test/lib/ansible_test/_internal/metadata.py
index e969f029ca..94bbc34a60 100644
--- a/test/lib/ansible_test/_internal/metadata.py
+++ b/test/lib/ansible_test/_internal/metadata.py
@@ -19,7 +19,7 @@ from .diff import (
 
 class Metadata:
     """Metadata object for passing data to delegated tests."""
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialize metadata."""
         self.changes: dict[str, tuple[tuple[int, int], ...]] = {}
         self.cloud_config: t.Optional[dict[str, dict[str, t.Union[int, str, bool]]]] = None
@@ -82,7 +82,7 @@ class Metadata:
 
 class ChangeDescription:
     """Description of changes."""
-    def __init__(self):
+    def __init__(self) -> None:
         self.command: str = ''
         self.changed_paths: list[str] = []
         self.deleted_paths: list[str] = []
diff --git a/test/lib/ansible_test/_internal/provider/layout/__init__.py b/test/lib/ansible_test/_internal/provider/layout/__init__.py
index 2e8026bf19..aa6693f0a5 100644
--- a/test/lib/ansible_test/_internal/provider/layout/__init__.py
+++ b/test/lib/ansible_test/_internal/provider/layout/__init__.py
@@ -150,7 +150,7 @@ class ContentLayout(Layout):
 
 class LayoutMessages:
     """Messages generated during layout creation that should be deferred for later display."""
-    def __init__(self):
+    def __init__(self) -> None:
         self.info: list[str] = []
         self.warning: list[str] = []
         self.error: list[str] = []
diff --git a/test/lib/ansible_test/_internal/pypi_proxy.py b/test/lib/ansible_test/_internal/pypi_proxy.py
index fa26b5fddc..97663eadd1 100644
--- a/test/lib/ansible_test/_internal/pypi_proxy.py
+++ b/test/lib/ansible_test/_internal/pypi_proxy.py
@@ -119,7 +119,7 @@ def configure_target_pypi_proxy(args: EnvironmentConfig, profile: HostProfile, p
 
     create_posix_inventory(args, inventory_path, [profile])
 
-    def cleanup_pypi_proxy():
+    def cleanup_pypi_proxy() -> None:
         """Undo changes made to configure the PyPI proxy."""
         run_playbook(args, inventory_path, 'pypi_proxy_restore.yml', capture=True)
 
diff --git a/test/lib/ansible_test/_internal/target.py b/test/lib/ansible_test/_internal/target.py
index 9efd4b596a..6448f972c1 100644
--- a/test/lib/ansible_test/_internal/target.py
+++ b/test/lib/ansible_test/_internal/target.py
@@ -136,10 +136,8 @@ def filter_targets(targets: c.Iterable[TCompletionTarget],
             raise TargetPatternsNotMatched(unmatched)
 
 
-def walk_module_targets():
-    """
-    :rtype: collections.Iterable[TestTarget]
-    """
+def walk_module_targets() -> c.Iterable[TestTarget]:
+    """Iterate through the module test targets."""
     for target in walk_test_targets(path=data_context().content.module_path, module_path=data_context().content.module_path, extensions=MODULE_EXTENSIONS):
         if not target.module:
             continue
@@ -244,10 +242,8 @@ def walk_integration_targets() -> c.Iterable[IntegrationTarget]:
         yield IntegrationTarget(to_text(path), modules, prefixes)
 
 
-def load_integration_prefixes():
-    """
-    :rtype: dict[str, str]
-    """
+def load_integration_prefixes() -> dict[str, str]:
+    """Load and return the integration test prefixes."""
     path = data_context().content.integration_path
     file_paths = sorted(f for f in data_context().content.get_files(path) if os.path.splitext(os.path.basename(f))[0] == 'target-prefixes')
     prefixes = {}
@@ -313,7 +309,7 @@ def analyze_integration_target_dependencies(integration_targets: list[Integratio
     role_targets = [target for target in integration_targets if target.type == 'role']
     hidden_role_target_names = set(target.name for target in role_targets if 'hidden/' in target.aliases)
 
-    dependencies = collections.defaultdict(set)
+    dependencies: collections.defaultdict[str, set[str]] = collections.defaultdict(set)
 
     # handle setup dependencies
     for target in integration_targets:
@@ -405,12 +401,12 @@ def analyze_integration_target_dependencies(integration_targets: list[Integratio
 
 class CompletionTarget(metaclass=abc.ABCMeta):
     """Command-line argument completion target base class."""
-    def __init__(self):
-        self.name = None
-        self.path = None
-        self.base_path = None
-        self.modules = tuple()
-        self.aliases = tuple()
+    def __init__(self) -> None:
+        self.name = ''
+        self.path = ''
+        self.base_path: t.Optional[str] = None
+        self.modules: tuple[str, ...] = tuple()
+        self.aliases: tuple[str, ...] = tuple()
 
     def __eq__(self, other):
         if isinstance(other, CompletionTarget):
@@ -446,7 +442,7 @@ class TestTarget(CompletionTarget):
             module_prefix: t.Optional[str],
             base_path: str,
             symlink: t.Optional[bool] = None,
-    ):
+    ) -> None:
         super().__init__()
 
         if symlink is None:
@@ -665,8 +661,6 @@ class IntegrationTarget(CompletionTarget):
 
         target_type, actual_type = categorize_integration_test(self.name, list(static_aliases), force_target)
 
-        self._remove_group(groups, 'context')
-
         groups.extend(['context/', f'context/{target_type.name.lower()}'])
 
         if target_type != actual_type:
@@ -695,10 +689,6 @@ class IntegrationTarget(CompletionTarget):
         self.setup_always = tuple(sorted(set(g.split('/')[2] for g in groups if g.startswith('setup/always/'))))
         self.needs_target = tuple(sorted(set(g.split('/')[2] for g in groups if g.startswith('needs/target/'))))
 
-    @staticmethod
-    def _remove_group(groups, group):
-        return [g for g in groups if g != group and not g.startswith('%s/' % group)]
-
 
 class TargetPatternsNotMatched(ApplicationError):
     """One or more targets were not matched when a match was required."""
diff --git a/test/lib/ansible_test/_internal/test.py b/test/lib/ansible_test/_internal/test.py
index da6af355a4..dca0badb9e 100644
--- a/test/lib/ansible_test/_internal/test.py
+++ b/test/lib/ansible_test/_internal/test.py
@@ -333,10 +333,8 @@ class TestFailure(TestResult):
 
         return command
 
-    def find_docs(self):
-        """
-        :rtype: str
-        """
+    def find_docs(self) -> t.Optional[str]:
+        """Return the docs URL for this test or None if there is no docs URL."""
         if self.command != 'sanity':
             return None  # only sanity tests have docs links
 
diff --git a/test/lib/ansible_test/_internal/thread.py b/test/lib/ansible_test/_internal/thread.py
index d0ed1bab02..edaf1b5c3f 100644
--- a/test/lib/ansible_test/_internal/thread.py
+++ b/test/lib/ansible_test/_internal/thread.py
@@ -21,7 +21,7 @@ class WrappedThread(threading.Thread):
         self.action = action
         self.result = None
 
-    def run(self):
+    def run(self) -> None:
         """
         Run action and capture results or exception.
         Do not override. Do not call directly. Executed by the start() method.
@@ -35,11 +35,8 @@ class WrappedThread(threading.Thread):
         except:  # noqa
             self._result.put((None, sys.exc_info()))
 
-    def wait_for_result(self):
-        """
-        Wait for thread to exit and return the result or raise an exception.
-        :rtype: any
-        """
+    def wait_for_result(self) -> t.Any:
+        """Wait for thread to exit and return the result or raise an exception."""
         result, exception = self._result.get()
 
         if exception:
diff --git a/test/lib/ansible_test/_internal/timeout.py b/test/lib/ansible_test/_internal/timeout.py
index da5cfceb42..90ba583545 100644
--- a/test/lib/ansible_test/_internal/timeout.py
+++ b/test/lib/ansible_test/_internal/timeout.py
@@ -75,7 +75,7 @@ def configure_test_timeout(args: TestConfig) -> None:
     display.info('The %d minute test timeout expires in %s at %s.' % (
         timeout_duration, timeout_remaining, timeout_deadline), verbosity=1)
 
-    def timeout_handler(_dummy1, _dummy2):
+    def timeout_handler(_dummy1: t.Any, _dummy2: t.Any) -> None:
         """Runs when SIGUSR1 is received."""
         test_timeout.write(args)
 
diff --git a/test/lib/ansible_test/_internal/util.py b/test/lib/ansible_test/_internal/util.py
index 95a8280f5c..92f56f2b1f 100644
--- a/test/lib/ansible_test/_internal/util.py
+++ b/test/lib/ansible_test/_internal/util.py
@@ -611,7 +611,7 @@ class OutputThread(ReaderThread):
             src.close()
 
 
-def common_environment():
+def common_environment() -> dict[str, str]:
     """Common environment used for executing all programs."""
     env = dict(
         LC_ALL=CONFIGURED_LOCALE,
@@ -793,17 +793,17 @@ class Display:
         3: cyan,
     }
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.verbosity = 0
         self.color = sys.stdout.isatty()
-        self.warnings = []
-        self.warnings_unique = set()
+        self.warnings: list[str] = []
+        self.warnings_unique: set[str] = set()
         self.fd = sys.stderr  # default to stderr until config is initialized to avoid early messages going to stdout
         self.rows = 0
         self.columns = 0
         self.truncate = 0
         self.redact = True
-        self.sensitive = set()
+        self.sensitive: set[str] = set()
 
         if os.isatty(0):
             self.rows, self.columns = unpack('HHHH', fcntl.ioctl(0, TIOCGWINSZ, pack('HHHH', 0, 0, 0, 0)))[:2]
@@ -959,7 +959,7 @@ class HostConnectionError(ApplicationError):
             self._callback()
 
 
-def retry(func, ex_type=SubprocessError, sleep=10, attempts=10, warn=True):
+def retry(func: t.Callable[..., TValue], ex_type: t.Type[BaseException] = SubprocessError, sleep: int = 10, attempts: int = 10, warn: bool = True) -> TValue:
     """Retry the specified function on failure."""
     for dummy in range(1, attempts):
         try:
@@ -1090,7 +1090,7 @@ def load_module(path: str, name: str) -> None:
     spec.loader.exec_module(module)
 
 
-def sanitize_host_name(name):
+def sanitize_host_name(name: str) -> str:
     """Return a sanitized version of the given name, suitable for use as a hostname."""
     return re.sub('[^A-Za-z0-9]+', '-', name)[:63].strip('-')
 
diff --git a/test/lib/ansible_test/_internal/util_common.py b/test/lib/ansible_test/_internal/util_common.py
index fbd9e71d87..69d0a6eb09 100644
--- a/test/lib/ansible_test/_internal/util_common.py
+++ b/test/lib/ansible_test/_internal/util_common.py
@@ -96,7 +96,7 @@ class ResultType:
     TMP: ResultType = None
 
     @staticmethod
-    def _populate():
+    def _populate() -> None:
         ResultType.BOT = ResultType('bot')
         ResultType.COVERAGE = ResultType('coverage')
         ResultType.DATA = ResultType('data')
@@ -288,7 +288,7 @@ def get_injector_path() -> str:
 
     verified_chmod(injector_path, MODE_DIRECTORY)
 
-    def cleanup_injector():
+    def cleanup_injector() -> None:
         """Remove the temporary injector directory."""
         remove_tree(injector_path)
 
@@ -388,7 +388,7 @@ def create_interpreter_wrapper(interpreter: str, injected_interpreter: str) -> N
     verified_chmod(injected_interpreter, MODE_FILE_EXECUTE)
 
 
-def cleanup_python_paths():
+def cleanup_python_paths() -> None:
     """Clean up all temporary python directories."""
     for path in sorted(PYTHON_PATHS.values()):
         display.info('Cleaning up temporary python directory: %s' % path, verbosity=2)
@@ -449,7 +449,7 @@ def run_command(
                        output_stream=output_stream, cmd_verbosity=cmd_verbosity, str_errors=str_errors, error_callback=error_callback)
 
 
-def yamlcheck(python):
+def yamlcheck(python: PythonConfig) -> t.Optional[bool]:
     """Return True if PyYAML has libyaml support, False if it does not and None if it was not found."""
     result = json.loads(raw_command([python.path, os.path.join(ANSIBLE_TEST_TARGET_TOOLS_ROOT, 'yamlcheck.py')], capture=True)[0])