some unit test typechecking (#7802)

pyproject.toml

@@ -160,6 +160,11 @@ enable_error_code = [
     "redundant-expr",
     "truthy-bool",
 ]
+exclude = [
+  "tests/fixtures",
+  "tests/masonry/builders/fixtures",
+  "tests/utils/fixtures"
+]
 
 # use of importlib-metadata backport at python3.7 makes it impossible to
 # satisfy mypy without some ignores: but we get a different set of ignores at
@@ -178,6 +183,10 @@ warn_unused_ignores = false
 [[tool.mypy.overrides]]
 module = [
     'cachecontrol.*',
+    'cachy.*',
+    'deepdiff.*',
+    'httpretty.*',
+    'keyring.*',
     'lockfile.*',
     'pexpect.*',
     'requests_toolbelt.*',

tests/config/test_config.py

@@ -5,6 +5,7 @@ import re
 
 from pathlib import Path
 from typing import TYPE_CHECKING
+from typing import Any
 
 import pytest
 
@@ -19,7 +20,7 @@ if TYPE_CHECKING:
     from collections.abc import Iterator
 
 
-def get_options_based_on_normalizer(normalizer: Callable) -> str:
+def get_options_based_on_normalizer(normalizer: Callable[[str], Any]) -> str:
     flattened_config = flatten_dict(obj=Config.default_config, delimiter=".")
 
     for k in flattened_config:
@@ -30,13 +31,13 @@ def get_options_based_on_normalizer(normalizer: Callable) -> str:
 @pytest.mark.parametrize(
     ("name", "value"), [("installer.parallel", True), ("virtualenvs.create", True)]
 )
-def test_config_get_default_value(config: Config, name: str, value: bool):
+def test_config_get_default_value(config: Config, name: str, value: bool) -> None:
     assert config.get(name) is value
 
 
 def test_config_get_processes_depended_on_values(
     config: Config, config_cache_dir: Path
-):
+) -> None:
     assert str(config_cache_dir / "virtualenvs") == config.get("virtualenvs.path")
 
 
@@ -62,7 +63,7 @@ def test_config_get_from_environment_variable(
     env_var: str,
     env_value: str,
     value: bool,
-):
+) -> None:
     os.environ[env_var] = env_value
     assert config.get(name) is value
 
@@ -73,6 +74,6 @@ def test_config_get_from_environment_variable(
 )
 def test_config_expands_tilde_for_virtualenvs_path(
     config: Config, path_config: str, expected: Path
-):
+) -> None:
     config.merge({"virtualenvs": {"path": path_config}})
     assert config.virtualenvs_path == expected

tests/console/commands/cache/test_list.py

@@ -20,7 +20,7 @@ def tester(command_tester_factory: CommandTesterFactory) -> CommandTester:
 
 def test_cache_list(
     tester: CommandTester, mock_caches: None, repository_one: str, repository_two: str
-):
+) -> None:
     tester.execute()
 
     expected = f"""\
@@ -31,7 +31,7 @@ def test_cache_list(
     assert tester.io.fetch_output() == expected
 
 
-def test_cache_list_empty(tester: CommandTester, repository_cache_dir: Path):
+def test_cache_list_empty(tester: CommandTester, repository_cache_dir: Path) -> None:
     tester.execute()
 
     expected = """\

tests/console/commands/debug/test_resolve.py

@@ -33,7 +33,7 @@ def __add_packages(repo: TestRepository) -> None:
     repo.add_package(get_package("cleo", "0.6.5"))
 
 
-def test_debug_resolve_gives_resolution_results(tester: CommandTester):
+def test_debug_resolve_gives_resolution_results(tester: CommandTester) -> None:
     tester.execute("cachy")
 
     expected = """\
@@ -48,7 +48,9 @@ cachy          0.2.0
     assert tester.io.fetch_output() == expected
 
 
-def test_debug_resolve_tree_option_gives_the_dependency_tree(tester: CommandTester):
+def test_debug_resolve_tree_option_gives_the_dependency_tree(
+    tester: CommandTester,
+) -> None:
     tester.execute("cachy --tree")
 
     expected = """\
@@ -63,7 +65,7 @@ cachy 0.2.0
     assert tester.io.fetch_output() == expected
 
 
-def test_debug_resolve_git_dependency(tester: CommandTester):
+def test_debug_resolve_git_dependency(tester: CommandTester) -> None:
     tester.execute("git+https://github.com/demo/demo.git")
 
     expected = """\

tests/console/commands/env/test_list.py

@@ -36,7 +36,7 @@ def test_none_activated(
     venvs_in_cache_dirs: list[str],
     mocker: MockerFixture,
     env: MockEnv,
-):
+) -> None:
     mocker.patch("poetry.utils.env.EnvManager.get", return_value=env)
     tester.execute()
     expected = "\n".join(venvs_in_cache_dirs)
@@ -48,13 +48,15 @@ def test_activated(
     venvs_in_cache_dirs: list[str],
     venv_cache: Path,
     venv_activate_37: None,
-):
+) -> None:
     tester.execute()
     expected = "\n".join(venvs_in_cache_dirs).replace("py3.7", "py3.7 (Activated)")
     assert tester.io.fetch_output().strip() == expected
 
 
-def test_in_project_venv(tester: CommandTester, venvs_in_project_dir: list[str]):
+def test_in_project_venv(
+    tester: CommandTester, venvs_in_project_dir: list[str]
+) -> None:
     tester.execute()
     expected = ".venv (Activated)\n"
     assert tester.io.fetch_output() == expected
@@ -62,7 +64,7 @@ def test_in_project_venv(tester: CommandTester, venvs_in_project_dir: list[str])
 
 def test_in_project_venv_no_explicit_config(
     tester: CommandTester, venvs_in_project_dir_none: list[str]
-):
+) -> None:
     tester.execute()
     expected = ".venv (Activated)\n"
     assert tester.io.fetch_output() == expected
@@ -70,7 +72,7 @@ def test_in_project_venv_no_explicit_config(
 
 def test_in_project_venv_is_false(
     tester: CommandTester, venvs_in_project_dir_false: list[str]
-):
+) -> None:
     tester.execute()
     expected = ""
     assert tester.io.fetch_output() == expected

tests/console/commands/env/test_remove.py

@@ -29,7 +29,7 @@ def test_remove_by_python_version(
     venvs_in_cache_dirs: list[str],
     venv_name: str,
     venv_cache: Path,
-):
+) -> None:
     check_output = mocker.patch(
         "subprocess.check_output",
         side_effect=check_output_wrapper(Version.parse("3.6.6")),
@@ -49,7 +49,7 @@ def test_remove_by_name(
     venvs_in_cache_dirs: list[str],
     venv_name: str,
     venv_cache: Path,
-):
+) -> None:
     expected = ""
 
     for name in venvs_in_cache_dirs:
@@ -67,7 +67,7 @@ def test_remove_all(
     venvs_in_cache_dirs: list[str],
     venv_name: str,
     venv_cache: Path,
-):
+) -> None:
     expected = {""}
     tester.execute("--all")
     for name in venvs_in_cache_dirs:
@@ -81,7 +81,7 @@ def test_remove_all_and_version(
     venvs_in_cache_dirs: list[str],
     venv_name: str,
     venv_cache: Path,
-):
+) -> None:
     expected = {""}
     tester.execute(f"--all {venvs_in_cache_dirs[0]}")
     for name in venvs_in_cache_dirs:
@@ -95,7 +95,7 @@ def test_remove_multiple(
     venvs_in_cache_dirs: list[str],
     venv_name: str,
     venv_cache: Path,
-):
+) -> None:
     expected = {""}
     removed_envs = venvs_in_cache_dirs[0:2]
     remaining_envs = venvs_in_cache_dirs[2:]

tests/console/commands/self/test_add_plugins.py

@@ -38,7 +38,7 @@ def assert_plugin_add_result(
 def test_add_no_constraint(
     tester: CommandTester,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(Package("poetry-plugin", "0.1.0"))
 
     tester.execute("poetry-plugin")
@@ -61,7 +61,7 @@ Writing lock file
 def test_add_with_constraint(
     tester: CommandTester,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(Package("poetry-plugin", "0.1.0"))
     repo.add_package(Package("poetry-plugin", "0.2.0"))
 
@@ -84,7 +84,7 @@ Writing lock file
 def test_add_with_git_constraint(
     tester: CommandTester,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(Package("pendulum", "2.0.5"))
 
     tester.execute("git+https://github.com/demo/poetry-plugin.git")
@@ -109,7 +109,7 @@ Writing lock file
 def test_add_with_git_constraint_with_extras(
     tester: CommandTester,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(Package("pendulum", "2.0.5"))
     repo.add_package(Package("tomlkit", "0.7.0"))
 
@@ -153,7 +153,7 @@ def test_add_with_git_constraint_with_subdirectory(
     rev: str | None,
     tester: CommandTester,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(Package("pendulum", "2.0.5"))
 
     tester.execute(url)
@@ -189,7 +189,7 @@ def test_add_existing_plugin_warns_about_no_operation(
     tester: CommandTester,
     repo: TestRepository,
     installed: TestRepository,
-):
+) -> None:
     pyproject = SelfCommand.get_default_system_pyproject_file()
     with open(pyproject, "w", encoding="utf-8", newline="") as f:
         f.write(
@@ -230,7 +230,7 @@ def test_add_existing_plugin_updates_if_requested(
     tester: CommandTester,
     repo: TestRepository,
     installed: TestRepository,
-):
+) -> None:
     pyproject = SelfCommand.get_default_system_pyproject_file()
     with open(pyproject, "w", encoding="utf-8", newline="") as f:
         f.write(
@@ -276,7 +276,7 @@ def test_adding_a_plugin_can_update_poetry_dependencies_if_needed(
     tester: CommandTester,
     repo: TestRepository,
     installed: TestRepository,
-):
+) -> None:
     poetry_package = Package("poetry", "1.2.0")
     poetry_package.add_dependency(Factory.create_dependency("tomlkit", "^0.7.0"))
 

tests/console/commands/self/test_remove_plugins.py

@@ -66,7 +66,7 @@ def install_plugin(installed: Repository) -> None:
     installed.add_package(plugin)
 
 
-def test_remove_installed_package(tester: CommandTester):
+def test_remove_installed_package(tester: CommandTester) -> None:
     tester.execute("poetry-plugin")
 
     expected = """\
@@ -87,7 +87,7 @@ Writing lock file
     assert not dependencies
 
 
-def test_remove_installed_package_dry_run(tester: CommandTester):
+def test_remove_installed_package_dry_run(tester: CommandTester) -> None:
     tester.execute("poetry-plugin --dry-run")
 
     expected = f"""\

tests/console/commands/self/test_show_plugins.py

@@ -153,7 +153,7 @@ def mock_metadata_entry_points(
 def test_show_displays_installed_plugins(
     app: PoetryTestApplication,
     tester: CommandTester,
-):
+) -> None:
     tester.execute("")
 
     expected = """
@@ -179,7 +179,7 @@ def test_show_displays_installed_plugins(
 def test_show_displays_installed_plugins_with_multiple_plugins(
     app: PoetryTestApplication,
     tester: CommandTester,
-):
+) -> None:
     tester.execute("")
 
     expected = """
@@ -205,7 +205,7 @@ def test_show_displays_installed_plugins_with_multiple_plugins(
 def test_show_displays_installed_plugins_with_dependencies(
     app: PoetryTestApplication,
     tester: CommandTester,
-):
+) -> None:
     tester.execute("")
 
     expected = """

tests/console/commands/test_about.py

@@ -16,7 +16,7 @@ def tester(command_tester_factory: CommandTesterFactory) -> CommandTester:
     return command_tester_factory("about")
 
 
-def test_about(tester: CommandTester):
+def test_about(tester: CommandTester) -> None:
     from poetry.utils._compat import metadata
 
     tester.execute()

tests/console/commands/test_config.py

@@ -34,7 +34,7 @@ def tester(command_tester_factory: CommandTesterFactory) -> CommandTester:
 
 def test_show_config_with_local_config_file_empty(
     tester: CommandTester, mocker: MockerFixture
-):
+) -> None:
     mocker.patch(
         "poetry.factory.Factory.create_poetry",
         side_effect=PyProjectException("[tool.poetry] section not found"),
@@ -46,7 +46,7 @@ def test_show_config_with_local_config_file_empty(
 
 def test_list_displays_default_value_if_not_set(
     tester: CommandTester, config: Config, config_cache_dir: Path
-):
+) -> None:
     tester.execute("--list")
 
     cache_dir = json.dumps(str(config_cache_dir))
@@ -74,7 +74,7 @@ virtualenvs.prompt = "{{project_name}}-py{{python_version}}"
 
 def test_list_displays_set_get_setting(
     tester: CommandTester, config: Config, config_cache_dir: Path
-):
+) -> None:
     tester.execute("virtualenvs.create false")
 
     tester.execute("--list")
@@ -103,7 +103,7 @@ virtualenvs.prompt = "{{project_name}}-py{{python_version}}"
     assert tester.io.fetch_output() == expected
 
 
-def test_display_single_setting(tester: CommandTester, config: Config):
+def test_display_single_setting(tester: CommandTester, config: Config) -> None:
     tester.execute("virtualenvs.create")
 
     expected = """true
@@ -114,7 +114,7 @@ def test_display_single_setting(tester: CommandTester, config: Config):
 
 def test_display_single_local_setting(
     command_tester_factory: CommandTesterFactory, fixture_dir: FixtureDirGetter
-):
+) -> None:
     tester = command_tester_factory(
         "config", poetry=Factory().create_poetry(fixture_dir("with_local_config"))
     )
@@ -128,7 +128,7 @@ def test_display_single_local_setting(
 
 def test_list_displays_set_get_local_setting(
     tester: CommandTester, config: Config, config_cache_dir: Path
-):
+) -> None:
     tester.execute("virtualenvs.create false --local")
 
     tester.execute("--list")
@@ -163,7 +163,7 @@ def test_list_must_not_display_sources_from_pyproject_toml(
     command_tester_factory: CommandTesterFactory,
     config: Config,
     config_cache_dir: Path,
-):
+) -> None:
     source = fixture_dir("with_non_default_source_implicit")
     pyproject_content = (source / "pyproject.toml").read_text(encoding="utf-8")
     poetry = project_factory("foo", pyproject_content=pyproject_content)
@@ -195,7 +195,9 @@ virtualenvs.prompt = "{{project_name}}-py{{python_version}}"
     assert tester.io.fetch_output() == expected
 
 
-def test_set_pypi_token(tester: CommandTester, auth_config_source: DictConfigSource):
+def test_set_pypi_token(
+    tester: CommandTester, auth_config_source: DictConfigSource
+) -> None:
     tester.execute("pypi-token.pypi mytoken")
     tester.execute("--list")
 
@@ -206,7 +208,7 @@ def test_set_client_cert(
     tester: CommandTester,
     auth_config_source: DictConfigSource,
     mocker: MockerFixture,
-):
+) -> None:
     mocker.spy(ConfigSource, "__init__")
 
     tester.execute("certificates.foo.client-cert path/to/cert.pem")
@@ -231,7 +233,7 @@ def test_set_cert(
     mocker: MockerFixture,
     value: str,
     result: str | bool,
-):
+) -> None:
     mocker.spy(ConfigSource, "__init__")
 
     tester.execute(f"certificates.foo.cert {value}")
@@ -241,7 +243,7 @@ def test_set_cert(
 
 def test_config_installer_parallel(
     tester: CommandTester, command_tester_factory: CommandTesterFactory
-):
+) -> None:
     tester.execute("--local installer.parallel")
     assert tester.io.fetch_output().strip() == "true"
 

tests/console/commands/test_init.py

@@ -95,7 +95,7 @@ python = "~2.7 || ^3.6"
 
 def test_basic_interactive(
     tester: CommandTester, init_basic_inputs: str, init_basic_toml: str
-):
+) -> None:
     tester.execute(inputs=init_basic_inputs)
     assert init_basic_toml in tester.io.fetch_output()
 
@@ -106,7 +106,7 @@ def test_noninteractive(
     poetry: Poetry,
     repo: TestRepository,
     tmp_path: Path,
-):
+) -> None:
     command = app.find("init")
     command._pool = poetry.pool
 
@@ -128,7 +128,9 @@ def test_noninteractive(
     assert 'pytest = "^3.6.0"' in toml_content
 
 
-def test_interactive_with_dependencies(tester: CommandTester, repo: TestRepository):
+def test_interactive_with_dependencies(
+    tester: CommandTester, repo: TestRepository
+) -> None:
     repo.add_package(get_package("django-pendulum", "0.1.6-pre4"))
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
@@ -183,7 +185,7 @@ pytest = "^3.6.0"
 # Regression test for https://github.com/python-poetry/poetry/issues/2355
 def test_interactive_with_dependencies_and_no_selection(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     repo.add_package(get_package("django-pendulum", "0.1.6-pre4"))
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
@@ -224,7 +226,7 @@ python = "~2.7 || ^3.6"
     assert expected in tester.io.fetch_output()
 
 
-def test_empty_license(tester: CommandTester):
+def test_empty_license(tester: CommandTester) -> None:
     inputs = [
         "my-package",  # Package name
         "1.2.3",  # Version
@@ -254,7 +256,9 @@ python = "^{python}"
     assert expected in tester.io.fetch_output()
 
 
-def test_interactive_with_git_dependencies(tester: CommandTester, repo: TestRepository):
+def test_interactive_with_git_dependencies(
+    tester: CommandTester, repo: TestRepository
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -332,7 +336,7 @@ def test_generate_choice_list(
     tester: CommandTester,
     package_name: str,
     _generate_choice_list_packages: list[Package],
-):
+) -> None:
     init_command = tester.command
 
     packages = _generate_choice_list_packages
@@ -345,7 +349,7 @@ def test_generate_choice_list(
 
 def test_interactive_with_git_dependencies_with_reference(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -391,7 +395,7 @@ pytest = "^3.6.0"
 
 def test_interactive_with_git_dependencies_and_other_name(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -440,7 +444,7 @@ def test_interactive_with_directory_dependency(
     repo: TestRepository,
     source_dir: Path,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -491,7 +495,7 @@ def test_interactive_with_directory_dependency_and_other_name(
     repo: TestRepository,
     source_dir: Path,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -543,7 +547,7 @@ def test_interactive_with_file_dependency(
     repo: TestRepository,
     source_dir: Path,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -592,7 +596,7 @@ pytest = "^3.6.0"
 
 def test_interactive_with_wrong_dependency_inputs(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     inputs = [
         "my-package",  # Package name
         "1.2.3",  # Version
@@ -636,7 +640,7 @@ pytest = "3.6.0"
     assert expected in tester.io.fetch_output()
 
 
-def test_python_option(tester: CommandTester):
+def test_python_option(tester: CommandTester) -> None:
     inputs = [
         "my-package",  # Package name
         "1.2.3",  # Version
@@ -666,7 +670,7 @@ python = "~2.7 || ^3.6"
     assert expected in tester.io.fetch_output()
 
 
-def test_predefined_dependency(tester: CommandTester, repo: TestRepository):
+def test_predefined_dependency(tester: CommandTester, repo: TestRepository) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
 
     inputs = [
@@ -702,7 +706,7 @@ pendulum = "^2.0.0"
 
 def test_predefined_and_interactive_dependencies(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pyramid", "1.10"))
 
@@ -743,7 +747,7 @@ python = "~2.7 || ^3.6"
     assert 'pyramid = "^1.10"' in output
 
 
-def test_predefined_dev_dependency(tester: CommandTester, repo: TestRepository):
+def test_predefined_dev_dependency(tester: CommandTester, repo: TestRepository) -> None:
     repo.add_package(get_package("pytest", "3.6.0"))
 
     inputs = [
@@ -782,7 +786,7 @@ pytest = "^3.6.0"
 
 def test_predefined_and_interactive_dev_dependencies(
     tester: CommandTester, repo: TestRepository
-):
+) -> None:
     repo.add_package(get_package("pytest", "3.6.0"))
     repo.add_package(get_package("pytest-requests", "0.2.0"))
 
@@ -828,7 +832,7 @@ pytest-requests = "^0.2.0"
     assert 'pytest = "^3.6.0"' in output
 
 
-def test_predefined_all_options(tester: CommandTester, repo: TestRepository):
+def test_predefined_all_options(tester: CommandTester, repo: TestRepository) -> None:
     repo.add_package(get_package("pendulum", "2.0.0"))
     repo.add_package(get_package("pytest", "3.6.0"))
 
@@ -875,7 +879,7 @@ pytest = "^3.6.0"
     assert expected in output
 
 
-def test_add_package_with_extras_and_whitespace(tester: CommandTester):
+def test_add_package_with_extras_and_whitespace(tester: CommandTester) -> None:
     result = tester.command._parse_requirements(["databases[postgresql, sqlite]"])
 
     assert result[0]["name"] == "databases"
@@ -889,7 +893,7 @@ def test_init_existing_pyproject_simple(
     source_dir: Path,
     init_basic_inputs: str,
     init_basic_toml: str,
-):
+) -> None:
     pyproject_file = source_dir / "pyproject.toml"
     existing_section = """
 [tool.black]
@@ -907,7 +911,7 @@ def test_init_existing_pyproject_consistent_linesep(
     init_basic_inputs: str,
     init_basic_toml: str,
     linesep: str,
-):
+) -> None:
     pyproject_file = source_dir / "pyproject.toml"
     existing_section = """
 [tool.black]
@@ -929,7 +933,7 @@ def test_init_non_interactive_existing_pyproject_add_dependency(
     source_dir: Path,
     init_basic_inputs: str,
     repo: TestRepository,
-):
+) -> None:
     pyproject_file = source_dir / "pyproject.toml"
     existing_section = """
 [tool.black]
@@ -967,7 +971,7 @@ foo = "^1.19.2"
 
 def test_init_existing_pyproject_with_build_system_fails(
     tester: CommandTester, source_dir: Path, init_basic_inputs: str
-):
+) -> None:
     pyproject_file = source_dir / "pyproject.toml"
     existing_section = """
 [build-system]
@@ -997,14 +1001,14 @@ build-backend = "setuptools.build_meta"
         "   foo 2.0  ",
     ],
 )
-def test__validate_package_valid(name: str | None):
+def test_validate_package_valid(name: str | None) -> None:
     assert InitCommand._validate_package(name) == name
 
 
 @pytest.mark.parametrize(
     "name", ["foo bar 2.0", "   foo bar 2.0   ", "foo bar foobar 2.0"]
 )
-def test__validate_package_invalid(name: str):
+def test_validate_package_invalid(name: str) -> None:
     with pytest.raises(ValueError):
         assert InitCommand._validate_package(name)
 
@@ -1023,7 +1027,7 @@ def test_package_include(
     tester: CommandTester,
     package_name: str,
     include: str | None,
-):
+) -> None:
     tester.execute(
         inputs="\n".join(
             (
@@ -1074,7 +1078,7 @@ def test_respect_prefer_active_on_init(
     mocker: MockerFixture,
     tester: CommandTester,
     source_dir: Path,
-):
+) -> None:
     from poetry.utils.env import GET_PYTHON_VERSION_ONELINER
 
     orig_check_output = subprocess.check_output

tests/console/commands/test_install.py

@@ -119,7 +119,7 @@ def test_group_options_are_passed_to_the_installer(
     with_root: bool,
     tester: CommandTester,
     mocker: MockerFixture,
-):
+) -> None:
     """
     Group options are passed properly to the installer.
     """
@@ -155,7 +155,7 @@ def test_group_options_are_passed_to_the_installer(
 
 def test_sync_option_is_passed_to_the_installer(
     tester: CommandTester, mocker: MockerFixture
-):
+) -> None:
     """
     The --sync option is passed properly to the installer.
     """
@@ -169,7 +169,7 @@ def test_sync_option_is_passed_to_the_installer(
 @pytest.mark.parametrize("compile", [False, True])
 def test_compile_option_is_passed_to_the_installer(
     tester: CommandTester, mocker: MockerFixture, compile: bool
-):
+) -> None:
     """
     The --compile option is passed properly to the installer.
     """
@@ -187,7 +187,7 @@ def test_compile_option_is_passed_to_the_installer(
 @pytest.mark.parametrize("skip_directory_cli_value", [True, False])
 def test_no_directory_is_passed_to_installer(
     tester: CommandTester, mocker: MockerFixture, skip_directory_cli_value: bool
-):
+) -> None:
     """
     The --no-directory option is passed to the installer.
     """
@@ -204,7 +204,7 @@ def test_no_directory_is_passed_to_installer(
 
 def test_no_all_extras_doesnt_populate_installer(
     tester: CommandTester, mocker: MockerFixture
-):
+) -> None:
     """
     Not passing --all-extras means the installer doesn't see any extras.
     """
@@ -215,7 +215,9 @@ def test_no_all_extras_doesnt_populate_installer(
     assert not tester.command.installer._extras
 
 
-def test_all_extras_populates_installer(tester: CommandTester, mocker: MockerFixture):
+def test_all_extras_populates_installer(
+    tester: CommandTester, mocker: MockerFixture
+) -> None:
     """
     The --all-extras option results in extras passed to the installer.
     """
@@ -229,7 +231,7 @@ def test_all_extras_populates_installer(tester: CommandTester, mocker: MockerFix
 def test_extras_are_parsed_and_populate_installer(
     tester: CommandTester,
     mocker: MockerFixture,
-):
+) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
 
     tester.execute('--extras "first second third"')
@@ -237,7 +239,9 @@ def test_extras_are_parsed_and_populate_installer(
     assert tester.command.installer._extras == ["first", "second", "third"]
 
 
-def test_extras_conflicts_all_extras(tester: CommandTester, mocker: MockerFixture):
+def test_extras_conflicts_all_extras(
+    tester: CommandTester, mocker: MockerFixture
+) -> None:
     """
     The --extras doesn't make sense with --all-extras.
     """
@@ -266,7 +270,7 @@ def test_only_root_conflicts_with_without_only(
     options: str,
     tester: CommandTester,
     mocker: MockerFixture,
-):
+) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
 
     tester.execute(f"{options} --only-root")
@@ -300,7 +304,7 @@ def test_invalid_groups_with_without_only(
     options: dict[str, str],
     valid_groups: set[str],
     should_raise: bool,
-):
+) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
 
     cmd_args = " ".join(f"{flag} {groups}" for (flag, groups) in options.items())
@@ -324,7 +328,7 @@ def test_invalid_groups_with_without_only(
 def test_remove_untracked_outputs_deprecation_warning(
     tester: CommandTester,
     mocker: MockerFixture,
-):
+) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
 
     tester.execute("--remove-untracked")
@@ -337,7 +341,9 @@ def test_remove_untracked_outputs_deprecation_warning(
     )
 
 
-def test_dry_run_populates_installer(tester: CommandTester, mocker: MockerFixture):
+def test_dry_run_populates_installer(
+    tester: CommandTester, mocker: MockerFixture
+) -> None:
     """
     The --dry-run option results in extras passed to the installer.
     """
@@ -349,7 +355,7 @@ def test_dry_run_populates_installer(tester: CommandTester, mocker: MockerFixtur
     assert tester.command.installer._dry_run is True
 
 
-def test_dry_run_does_not_build(tester: CommandTester, mocker: MockerFixture):
+def test_dry_run_does_not_build(tester: CommandTester, mocker: MockerFixture) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
     mocked_editable_builder = mocker.patch(
         "poetry.masonry.builders.editable.EditableBuilder"
@@ -360,7 +366,7 @@ def test_dry_run_does_not_build(tester: CommandTester, mocker: MockerFixture):
     assert mocked_editable_builder.return_value.build.call_count == 0
 
 
-def test_install_logs_output(tester: CommandTester, mocker: MockerFixture):
+def test_install_logs_output(tester: CommandTester, mocker: MockerFixture) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
     mocker.patch("poetry.masonry.builders.editable.EditableBuilder")
 
@@ -373,7 +379,9 @@ def test_install_logs_output(tester: CommandTester, mocker: MockerFixture):
     )
 
 
-def test_install_logs_output_decorated(tester: CommandTester, mocker: MockerFixture):
+def test_install_logs_output_decorated(
+    tester: CommandTester, mocker: MockerFixture
+) -> None:
     mocker.patch.object(tester.command.installer, "run", return_value=0)
     mocker.patch("poetry.masonry.builders.editable.EditableBuilder")
 
@@ -402,7 +410,7 @@ def test_install_path_dependency_does_not_exist(
     fixture_dir: FixtureDirGetter,
     project: str,
     options: str,
-):
+) -> None:
     poetry = _project_factory(project, project_factory, fixture_dir)
     poetry.locker.locked(True)
     tester = command_tester_factory("install", poetry=poetry)

tests/console/commands/test_lock.py

@@ -93,7 +93,7 @@ def test_lock_check_outdated(
     command_tester_factory: CommandTesterFactory,
     poetry_with_outdated_lockfile: Poetry,
     http: type[httpretty.httpretty],
-):
+) -> None:
     http.disable()
 
     locker = Locker(
@@ -119,7 +119,7 @@ def test_lock_check_up_to_date(
     command_tester_factory: CommandTesterFactory,
     poetry_with_up_to_date_lockfile: Poetry,
     http: type[httpretty.httpretty],
-):
+) -> None:
     http.disable()
 
     locker = Locker(
@@ -141,7 +141,7 @@ def test_lock_no_update(
     command_tester_factory: CommandTesterFactory,
     poetry_with_old_lockfile: Poetry,
     repo: TestRepository,
-):
+) -> None:
     repo.add_package(get_package("sampleproject", "1.3.1"))
     repo.add_package(get_package("sampleproject", "2.0.0"))
 
@@ -178,7 +178,7 @@ def test_lock_no_update_path_dependencies(
     command_tester_factory: CommandTesterFactory,
     poetry_with_nested_path_deps_old_lockfile: Poetry,
     repo: TestRepository,
-):
+) -> None:
     """
     The lock file contains a variant of the directory dependency "quix" that does
     not depend on "sampleproject". Although the version of "quix" has not been changed,
@@ -214,7 +214,7 @@ def test_lock_path_dependency_does_not_exist(
     fixture_dir: FixtureDirGetter,
     project: str,
     update: bool,
-):
+) -> None:
     poetry = _project_factory(project, project_factory, fixture_dir)
     locker = Locker(
         lock=poetry.pyproject.file.path.parent / "poetry.lock",
@@ -242,7 +242,7 @@ def test_lock_path_dependency_deleted_from_pyproject(
     fixture_dir: FixtureDirGetter,
     project: str,
     update: bool,
-):
+) -> None:
     poetry = _project_factory(project, project_factory, fixture_dir)
     locker = Locker(
         lock=poetry.pyproject.file.path.parent / "poetry.lock",

tests/console/commands/test_new.py

@@ -156,7 +156,7 @@ def test_command_new(
     include_from: str | None,
     tester: CommandTester,
     tmp_path: Path,
-):
+) -> None:
     path = tmp_path / directory
     options.append(str(path))
     tester.execute(" ".join(options))
@@ -166,7 +166,7 @@ def test_command_new(
 @pytest.mark.parametrize(("fmt",), [(None,), ("md",), ("rst",), ("adoc",), ("creole",)])
 def test_command_new_with_readme(
     fmt: str | None, tester: CommandTester, tmp_path: Path
-):
+) -> None:
     package = "package"
     path = tmp_path / package
     options = [path.as_posix()]
@@ -194,7 +194,7 @@ def test_respect_prefer_active_on_new(
     mocker: MockerFixture,
     tester: CommandTester,
     tmp_path: Path,
-):
+) -> None:
     from poetry.utils.env import GET_PYTHON_VERSION_ONELINER
 
     orig_check_output = subprocess.check_output

tests/console/commands/test_publish.py

@@ -23,7 +23,7 @@ def test_publish_returns_non_zero_code_for_upload_errors(
     app: PoetryTestApplication,
     app_tester: ApplicationTester,
     http: type[httpretty.httpretty],
-):
+) -> None:
     http.register_uri(
         http.POST, "https://upload.pypi.org/legacy/", status=400, body="Bad Request"
     )
@@ -48,7 +48,7 @@ def test_publish_returns_non_zero_code_for_connection_errors(
     app: PoetryTestApplication,
     app_tester: ApplicationTester,
     http: type[httpretty.httpretty],
-):
+) -> None:
     def request_callback(*_: Any, **__: Any) -> None:
         raise requests.ConnectionError()
 
@@ -65,7 +65,9 @@ def test_publish_returns_non_zero_code_for_connection_errors(
     assert expected in app_tester.io.fetch_error()
 
 
-def test_publish_with_cert(app_tester: ApplicationTester, mocker: MockerFixture):
+def test_publish_with_cert(
+    app_tester: ApplicationTester, mocker: MockerFixture
+) -> None:
     publisher_publish = mocker.patch("poetry.publishing.Publisher.publish")
 
     app_tester.execute("publish --cert path/to/ca.pem")
@@ -75,7 +77,9 @@ def test_publish_with_cert(app_tester: ApplicationTester, mocker: MockerFixture)
     ] == publisher_publish.call_args
 
 
-def test_publish_with_client_cert(app_tester: ApplicationTester, mocker: MockerFixture):
+def test_publish_with_client_cert(
+    app_tester: ApplicationTester, mocker: MockerFixture
+) -> None:
     publisher_publish = mocker.patch("poetry.publishing.Publisher.publish")
 
     app_tester.execute("publish --client-cert path/to/client.pem")
@@ -94,7 +98,7 @@ def test_publish_with_client_cert(app_tester: ApplicationTester, mocker: MockerF
 )
 def test_publish_dry_run_skip_existing(
     app_tester: ApplicationTester, http: type[httpretty.httpretty], options: str
-):
+) -> None:
     http.register_uri(
         http.POST, "https://upload.pypi.org/legacy/", status=409, body="Conflict"
     )
@@ -113,7 +117,7 @@ def test_publish_dry_run_skip_existing(
 
 def test_skip_existing_output(
     app_tester: ApplicationTester, http: type[httpretty.httpretty]
-):
+) -> None:
     http.register_uri(
         http.POST, "https://upload.pypi.org/legacy/", status=409, body="Conflict"
     )

tests/console/commands/test_remove.py

@@ -48,7 +48,7 @@ def test_remove_without_specific_group_removes_from_all_groups(
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
     installed: Repository,
-):
+) -> None:
     """
     Removing without specifying a group removes packages from all groups.
     """
@@ -105,7 +105,7 @@ def test_remove_without_specific_group_removes_from_specific_groups(
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
     installed: Repository,
-):
+) -> None:
     """
     Removing with a specific group given removes packages only from this group.
     """
@@ -162,7 +162,7 @@ def test_remove_does_not_live_empty_groups(
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
     installed: Repository,
-):
+) -> None:
     """
     Empty groups are automatically discarded after package removal.
     """
@@ -208,7 +208,7 @@ def test_remove_canonicalized_named_removes_dependency_correctly(
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
     installed: Repository,
-):
+) -> None:
     """
     Removing a dependency using a canonicalized named removes the dependency.
     """
@@ -267,7 +267,7 @@ def test_remove_command_should_not_write_changes_upon_installer_errors(
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
     mocker: MockerFixture,
-):
+) -> None:
     repo.add_package(Package("foo", "2.0.0"))
 
     command_tester_factory("add").execute("foo")
@@ -285,7 +285,7 @@ def test_remove_with_dry_run_keep_files_intact(
     poetry_with_up_to_date_lockfile: Poetry,
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
-):
+) -> None:
     tester = command_tester_factory("remove", poetry=poetry_with_up_to_date_lockfile)
 
     original_pyproject_content = poetry_with_up_to_date_lockfile.file.read()

tests/console/commands/test_run.py

@@ -45,14 +45,14 @@ def poetry_with_scripts(
     )
 
 
-def test_run_passes_all_args(app_tester: ApplicationTester, env: MockEnv):
+def test_run_passes_all_args(app_tester: ApplicationTester, env: MockEnv) -> None:
     app_tester.execute("run python -V")
     assert [["python", "-V"]] == env.executed
 
 
 def test_run_keeps_options_passed_before_command(
     app_tester: ApplicationTester, env: MockEnv
-):
+) -> None:
     app_tester.execute("-V --no-ansi run python", decorated=True)
 
     assert not app_tester.io.is_decorated()
@@ -64,7 +64,7 @@ def test_run_keeps_options_passed_before_command(
 
 def test_run_has_helpful_error_when_command_not_found(
     app_tester: ApplicationTester, env: MockEnv, capfd: pytest.CaptureFixture[str]
-):
+) -> None:
     nonexistent_command = "nonexistent-command"
     env._execute = True
     app_tester.execute(f"run {nonexistent_command}")
@@ -94,7 +94,7 @@ def test_run_has_helpful_error_when_command_not_found(
 def test_run_console_scripts_of_editable_dependencies_on_windows(
     tmp_venv: VirtualEnv,
     command_tester_factory: CommandTesterFactory,
-):
+) -> None:
     """
     On Windows, Poetry installs console scripts of editable dependencies by creating
     in the environment's `Scripts/` directory both:

tests/console/commands/test_shell.py

@@ -20,7 +20,7 @@ def tester(command_tester_factory: CommandTesterFactory) -> CommandTester:
     return command_tester_factory("shell")
 
 
-def test_shell(tester: CommandTester, mocker: MockerFixture):
+def test_shell(tester: CommandTester, mocker: MockerFixture) -> None:
     shell_activate = mocker.patch("poetry.utils.shell.Shell.activate")
 
     tester.execute()
@@ -32,7 +32,7 @@ def test_shell(tester: CommandTester, mocker: MockerFixture):
     assert tester.status_code == 0
 
 
-def test_shell_already_active(tester: CommandTester, mocker: MockerFixture):
+def test_shell_already_active(tester: CommandTester, mocker: MockerFixture) -> None:
     os.environ["POETRY_ACTIVE"] = "1"
     shell_activate = mocker.patch("poetry.utils.shell.Shell.activate")
 
@@ -71,7 +71,7 @@ def test__is_venv_activated(
     real_prefix: str | None,
     prefix: str,
     expected: bool,
-):
+) -> None:
     mocker.patch.object(tester.command.env, "_path", Path("foobar"))
     mocker.patch("sys.prefix", prefix)
 

tests/console/commands/test_update.py

@@ -40,7 +40,7 @@ def test_update_with_dry_run_keep_files_intact(
     poetry_with_up_to_date_lockfile: Poetry,
     repo: TestRepository,
     command_tester_factory: CommandTesterFactory,
-):
+) -> None:
     tester = command_tester_factory("update", poetry=poetry_with_up_to_date_lockfile)
 
     original_pyproject_content = poetry_with_up_to_date_lockfile.file.read()

tests/console/commands/test_version.py

@@ -51,31 +51,31 @@ def tester(command_tester_factory: CommandTesterFactory) -> CommandTester:
 )
 def test_increment_version(
     version: str, rule: str, expected: str, command: VersionCommand
-):
+) -> None:
     assert command.increment_version(version, rule).text == expected
 
 
-def test_version_show(tester: CommandTester):
+def test_version_show(tester: CommandTester) -> None:
     tester.execute()
     assert tester.io.fetch_output() == "simple-project 1.2.3\n"
 
 
-def test_short_version_show(tester: CommandTester):
+def test_short_version_show(tester: CommandTester) -> None:
     tester.execute("--short")
     assert tester.io.fetch_output() == "1.2.3\n"
 
 
-def test_version_update(tester: CommandTester):
+def test_version_update(tester: CommandTester) -> None:
     tester.execute("2.0.0")
     assert tester.io.fetch_output() == "Bumping version from 1.2.3 to 2.0.0\n"
 
 
-def test_short_version_update(tester: CommandTester):
+def test_short_version_update(tester: CommandTester) -> None:
     tester.execute("--short 2.0.0")
     assert tester.io.fetch_output() == "2.0.0\n"
 
 
-def test_dry_run(tester: CommandTester):
+def test_dry_run(tester: CommandTester) -> None:
     old_pyproject = tester.command.poetry.file.path.read_text()
     tester.execute("--dry-run major")
 

tests/console/test_application.py

@@ -39,7 +39,7 @@ def with_add_command_plugin(mocker: MockerFixture) -> None:
     mock_metadata_entry_points(mocker, AddCommandPlugin)
 
 
-def test_application_with_plugins(with_add_command_plugin: None):
+def test_application_with_plugins(with_add_command_plugin: None) -> None:
     app = Application()
 
     tester = ApplicationTester(app)
@@ -49,7 +49,7 @@ def test_application_with_plugins(with_add_command_plugin: None):
     assert tester.status_code == 0
 
 
-def test_application_with_plugins_disabled(with_add_command_plugin: None):
+def test_application_with_plugins_disabled(with_add_command_plugin: None) -> None:
     app = Application()
 
     tester = ApplicationTester(app)
@@ -59,7 +59,7 @@ def test_application_with_plugins_disabled(with_add_command_plugin: None):
     assert tester.status_code == 0
 
 
-def test_application_execute_plugin_command(with_add_command_plugin: None):
+def test_application_execute_plugin_command(with_add_command_plugin: None) -> None:
     app = Application()
 
     tester = ApplicationTester(app)
@@ -71,7 +71,7 @@ def test_application_execute_plugin_command(with_add_command_plugin: None):
 
 def test_application_execute_plugin_command_with_plugins_disabled(
     with_add_command_plugin: None,
-):
+) -> None:
     app = Application()
 
     tester = ApplicationTester(app)
@@ -83,7 +83,7 @@ def test_application_execute_plugin_command_with_plugins_disabled(
 
 
 @pytest.mark.parametrize("disable_cache", [True, False])
-def test_application_verify_source_cache_flag(disable_cache: bool):
+def test_application_verify_source_cache_flag(disable_cache: bool) -> None:
     app = Application()
 
     tester = ApplicationTester(app)

tests/installation/test_chef.py

@@ -68,7 +68,7 @@ def test_prepare_directory(
     config_cache_dir: Path,
     artifact_cache: ArtifactCache,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     chef = Chef(
         artifact_cache, EnvManager.get_system_env(), Factory.create_pool(config)
     )
@@ -107,7 +107,7 @@ def test_prepare_directory_editable(
     config_cache_dir: Path,
     artifact_cache: ArtifactCache,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     chef = Chef(
         artifact_cache, EnvManager.get_system_env(), Factory.create_pool(config)
     )

tests/installation/test_executor.py

@@ -203,7 +203,7 @@ def test_execute_executes_a_batch_of_operations(
     env: MockEnv,
     copy_wheel: Callable[[], Path],
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     wheel_install = mocker.patch.object(WheelInstaller, "install")
 
     config.merge({"cache-dir": str(tmp_path)})
@@ -314,7 +314,7 @@ def test_execute_prints_warning_for_yanked_package(
     env: MockEnv,
     operations: list[Operation],
     has_warning: bool,
-):
+) -> None:
     config.merge({"cache-dir": str(tmp_path)})
 
     executor = Executor(env, pool, config, io)
@@ -345,7 +345,7 @@ def test_execute_prints_warning_for_invalid_wheels(
     tmp_path: Path,
     mock_file_downloads: None,
     env: MockEnv,
-):
+) -> None:
     config.merge({"cache-dir": str(tmp_path)})
 
     executor = Executor(env, pool, config, io)
@@ -404,7 +404,7 @@ def test_execute_shows_skipped_operations_if_verbose(
     io: BufferedIO,
     config_cache_dir: Path,
     env: MockEnv,
-):
+) -> None:
     config.merge({"cache-dir": config_cache_dir.as_posix()})
 
     executor = Executor(env, pool, config, io)
@@ -432,7 +432,7 @@ def test_execute_should_show_errors(
     mocker: MockerFixture,
     io: BufferedIO,
     env: MockEnv,
-):
+) -> None:
     executor = Executor(env, pool, config, io)
     executor.verbose()
 
@@ -460,7 +460,7 @@ def test_execute_works_with_ansi_output(
     tmp_path: Path,
     mock_file_downloads: None,
     env: MockEnv,
-):
+) -> None:
     config.merge({"cache-dir": str(tmp_path)})
 
     executor = Executor(env, pool, config, io_decorated)
@@ -497,7 +497,7 @@ def test_execute_works_with_no_ansi_output(
     tmp_path: Path,
     mock_file_downloads: None,
     env: MockEnv,
-):
+) -> None:
     config.merge({"cache-dir": str(tmp_path)})
 
     executor = Executor(env, pool, config, io_not_decorated)
@@ -525,7 +525,7 @@ def test_execute_should_show_operation_as_cancelled_on_subprocess_keyboard_inter
     mocker: MockerFixture,
     io: BufferedIO,
     env: MockEnv,
-):
+) -> None:
     executor = Executor(env, pool, config, io)
     executor.verbose()
 
@@ -550,7 +550,7 @@ def test_execute_should_gracefully_handle_io_error(
     mocker: MockerFixture,
     io: BufferedIO,
     env: MockEnv,
-):
+) -> None:
     executor = Executor(env, pool, config, io)
     executor.verbose()
 
@@ -584,7 +584,7 @@ def test_executor_should_delete_incomplete_downloads(
     mock_file_downloads: None,
     env: MockEnv,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     fixture = fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl"
     destination_fixture = tmp_path / "tomlkit-0.5.3-py2.py3-none-any.whl"
     shutil.copyfile(str(fixture), str(destination_fixture))
@@ -613,7 +613,7 @@ def test_executor_should_delete_incomplete_downloads(
 
 def verify_installed_distribution(
     venv: VirtualEnv, package: Package, url_reference: dict[str, Any] | None = None
-):
+) -> None:
     distributions = list(venv.site_packages.distributions(name=package.name))
     assert len(distributions) == 1
 
@@ -660,7 +660,7 @@ def test_executor_should_not_write_pep610_url_references_for_cached_package(
     pool: RepositoryPool,
     config: Config,
     io: BufferedIO,
-):
+) -> None:
     link_cached = fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl"
     package.files = [
         {
@@ -685,7 +685,7 @@ def test_executor_should_write_pep610_url_references_for_wheel_files(
     config: Config,
     io: BufferedIO,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     url = (fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl").resolve()
     package = Package("demo", "0.1.0", source_type="file", source_url=url.as_posix())
     # Set package.files so the executor will attempt to hash the package
@@ -718,7 +718,7 @@ def test_executor_should_write_pep610_url_references_for_non_wheel_files(
     config: Config,
     io: BufferedIO,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     url = (fixture_dir("distributions") / "demo-0.1.0.tar.gz").resolve()
     package = Package("demo", "0.1.0", source_type="file", source_url=url.as_posix())
     # Set package.files so the executor will attempt to hash the package
@@ -754,7 +754,7 @@ def test_executor_should_write_pep610_url_references_for_directories(
     wheel: Path,
     fixture_dir: FixtureDirGetter,
     mocker: MockerFixture,
-):
+) -> None:
     url = (fixture_dir("git") / "github.com" / "demo" / "demo").resolve()
     package = Package(
         "demo", "0.1.2", source_type="directory", source_url=url.as_posix()
@@ -782,7 +782,7 @@ def test_executor_should_write_pep610_url_references_for_editable_directories(
     wheel: Path,
     fixture_dir: FixtureDirGetter,
     mocker: MockerFixture,
-):
+) -> None:
     url = (fixture_dir("git") / "github.com" / "demo" / "demo").resolve()
     package = Package(
         "demo",
@@ -815,7 +815,7 @@ def test_executor_should_write_pep610_url_references_for_wheel_urls(
     mocker: MockerFixture,
     fixture_dir: FixtureDirGetter,
     is_artifact_cached: bool,
-):
+) -> None:
     if is_artifact_cached:
         link_cached = fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl"
         mocker.patch(
@@ -887,7 +887,7 @@ def test_executor_should_write_pep610_url_references_for_non_wheel_urls(
     is_wheel_cached: bool,
     expect_artifact_building: bool,
     expect_artifact_download: bool,
-):
+) -> None:
     built_wheel = fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl"
     mock_prepare = mocker.patch(
         "poetry.installation.chef.Chef._prepare",
@@ -899,7 +899,9 @@ def test_executor_should_write_pep610_url_references_for_non_wheel_urls(
         cached_sdist = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
         cached_wheel = fixture_dir("distributions") / "demo-0.1.0-py2.py3-none-any.whl"
 
-        def mock_get_cached_archive_for_link_func(_: Link, *, strict: bool, **__: Any):
+        def mock_get_cached_archive_for_link_func(
+            _: Link, *, strict: bool, **__: Any
+        ) -> None:
             if is_wheel_cached and not strict:
                 return cached_wheel
             if is_sdist_cached:
@@ -966,7 +968,7 @@ def test_executor_should_write_pep610_url_references_for_git(
     mocker: MockerFixture,
     fixture_dir: FixtureDirGetter,
     is_artifact_cached: bool,
-):
+) -> None:
     if is_artifact_cached:
         link_cached = fixture_dir("distributions") / "demo-0.1.2-py2.py3-none-any.whl"
         mocker.patch(
@@ -1029,7 +1031,7 @@ def test_executor_should_write_pep610_url_references_for_editable_git(
     wheel: Path,
     mocker: MockerFixture,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     source_resolved_reference = "123456"
     source_url = "https://github.com/demo/demo.git"
 
@@ -1106,7 +1108,7 @@ def test_executor_should_write_pep610_url_references_for_git_with_subdirectories
     io: BufferedIO,
     mock_file_downloads: None,
     wheel: Path,
-):
+) -> None:
     package = Package(
         "demo",
         "0.1.2",
@@ -1159,7 +1161,7 @@ def test_executor_should_be_initialized_with_correct_workers(
     cpu_count: int | None,
     side_effect: Exception | None,
     expected_workers: int,
-):
+) -> None:
     config.merge({"installer": {"max-workers": max_workers}})
 
     mocker.patch("os.cpu_count", return_value=cpu_count, side_effect=side_effect)
@@ -1178,7 +1180,7 @@ def test_executor_fallback_on_poetry_create_error_without_wheel_installer(
     mock_file_downloads: None,
     env: MockEnv,
     fixture_dir: FixtureDirGetter,
-):
+) -> None:
     mock_pip_install = mocker.patch("poetry.installation.executor.pip_install")
     mock_sdist_builder = mocker.patch("poetry.core.masonry.builders.sdist.SdistBuilder")
     mock_editable_builder = mocker.patch(

tests/integration/test_utils_vcs_git.py

@@ -112,7 +112,7 @@ def remote_default_branch(remote_default_ref: bytes) -> str:
 
 
 # Regression test for https://github.com/python-poetry/poetry/issues/6722
-def test_use_system_git_client_from_environment_variables():
+def test_use_system_git_client_from_environment_variables() -> None:
     os.environ["POETRY_EXPERIMENTAL_SYSTEM_GIT_CLIENT"] = "true"
 
     assert Git.is_using_legacy_client()
@@ -132,7 +132,7 @@ def test_git_clone_default_branch_head(
     remote_refs: FetchPackResult,
     remote_default_ref: bytes,
     mocker: MockerFixture,
-):
+) -> None:
     spy = mocker.spy(Git, "_clone")
     spy_legacy = mocker.spy(Git, "_clone_legacy")
 
@@ -143,7 +143,7 @@ def test_git_clone_default_branch_head(
     spy.assert_called()
 
 
-def test_git_clone_fails_for_non_existent_branch(source_url: str):
+def test_git_clone_fails_for_non_existent_branch(source_url: str) -> None:
     branch = uuid.uuid4().hex
 
     with pytest.raises(PoetryConsoleError) as e:
@@ -152,7 +152,7 @@ def test_git_clone_fails_for_non_existent_branch(source_url: str):
     assert f"Failed to clone {source_url} at '{branch}'" in str(e.value)
 
 
-def test_git_clone_fails_for_non_existent_revision(source_url: str):
+def test_git_clone_fails_for_non_existent_revision(source_url: str) -> None:
     revision = sha1(uuid.uuid4().bytes).hexdigest()
 
     with pytest.raises(PoetryConsoleError) as e:

tests/plugins/test_plugin_manager.py

 from __future__ import annotations
 
+from pathlib import Path
 from typing import TYPE_CHECKING
 
 import pytest
@@ -17,6 +18,7 @@ from tests.helpers import mock_metadata_entry_points
 
 
 if TYPE_CHECKING:
+    from cleo.io.io import IO
     from pytest_mock import MockerFixture
 
     from tests.conftest import Config
@@ -29,9 +31,9 @@ class ManagerFactory(Protocol):
 
 
 class MyPlugin(Plugin):
-    def activate(self, poetry: Poetry, io: BufferedIO) -> None:
+    def activate(self, poetry: Poetry, io: IO) -> None:
         io.write_line("Setting readmes")
-        poetry.package.readmes = ("README.md",)
+        poetry.package.readmes = (Path("README.md"),)
 
 
 class MyCommandPlugin(ApplicationPlugin):
@@ -39,7 +41,7 @@ class MyCommandPlugin(ApplicationPlugin):
 
 
 class InvalidPlugin:
-    def activate(self, poetry: Poetry, io: BufferedIO) -> None:
+    def activate(self, poetry: Poetry, io: IO) -> None:
         io.write_line("Updating version")
         poetry.package.version = "9.9.9"
 
@@ -59,7 +61,7 @@ def poetry(fixture_dir: FixtureDirGetter, config: Config) -> Poetry:
 
 
 @pytest.fixture()
-def io() -> BufferedIO:
+def io() -> IO:
     return BufferedIO()
 
 
@@ -86,7 +88,7 @@ def test_load_plugins_and_activate(
     manager.load_plugins()
     manager.activate(poetry, io)
 
-    assert poetry.package.readmes == ("README.md",)
+    assert poetry.package.readmes == (Path("README.md"),)
     assert io.fetch_output() == "Setting readmes\n"
 
 

tests/puzzle/test_provider.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from subprocess import CalledProcessError
 from typing import TYPE_CHECKING
+from typing import Any
 
 import pytest
 
@@ -35,7 +36,7 @@ SOME_URL = "https://example.com/path.tar.gz"
 
 
 class MockEnv(BaseMockEnv):
-    def run(self, bin: str, *args: str) -> None:
+    def run(self, bin: str, *args: str, **kwargs: Any) -> str | int:
         raise EnvCommandError(CalledProcessError(1, "python", output=""))
 
 

tests/puzzle/test_solver.py

@@ -3410,7 +3410,7 @@ def test_solver_should_not_update_same_version_packages_if_installed_has_no_sour
 
 def test_solver_should_use_the_python_constraint_from_the_environment_if_available(
     solver: Solver, repo: Repository, package: ProjectPackage
-):
+) -> None:
     set_package_python_versions(solver.provider, "~2.7 || ^3.5")
     package.add_dependency(Factory.create_dependency("A", "^1.0"))
 

tests/repositories/test_installed_repository.py

@@ -51,10 +51,10 @@ INSTALLED_RESULTS = [
 
 class MockEnv(BaseMockEnv):
     @property
-    def paths(self) -> dict[str, Path]:
+    def paths(self) -> dict[str, str]:
         return {
-            "purelib": SITE_PURELIB,
-            "platlib": SITE_PLATLIB,
+            "purelib": SITE_PURELIB.as_posix(),
+            "platlib": SITE_PLATLIB.as_posix(),
         }
 
     @property
@@ -96,7 +96,7 @@ def get_package_from_repository(
     return None
 
 
-def test_load_successful(repository: InstalledRepository):
+def test_load_successful(repository: InstalledRepository) -> None:
     assert len(repository.packages) == len(INSTALLED_RESULTS)
 
 
@@ -119,12 +119,12 @@ def test_load_successful_with_invalid_distribution(
     assert str(invalid_dist_info) in message
 
 
-def test_load_ensure_isolation(repository: InstalledRepository):
+def test_load_ensure_isolation(repository: InstalledRepository) -> None:
     package = get_package_from_repository("attrs", repository)
     assert package is None
 
 
-def test_load_standard_package(repository: InstalledRepository):
+def test_load_standard_package(repository: InstalledRepository) -> None:
     cleo = get_package_from_repository("cleo", repository)
     assert cleo is not None
     assert cleo.name == "cleo"
@@ -139,7 +139,7 @@ def test_load_standard_package(repository: InstalledRepository):
     assert foo.version.text == "0.1.0"
 
 
-def test_load_git_package(repository: InstalledRepository):
+def test_load_git_package(repository: InstalledRepository) -> None:
     pendulum = get_package_from_repository("pendulum", repository)
     assert pendulum is not None
     assert pendulum.name == "pendulum"
@@ -153,7 +153,7 @@ def test_load_git_package(repository: InstalledRepository):
     assert pendulum.source_reference == "bb058f6b78b2d28ef5d9a5e759cfa179a1a713d6"
 
 
-def test_load_git_package_pth(repository: InstalledRepository):
+def test_load_git_package_pth(repository: InstalledRepository) -> None:
     bender = get_package_from_repository("bender", repository)
     assert bender is not None
     assert bender.name == "bender"
@@ -161,14 +161,14 @@ def test_load_git_package_pth(repository: InstalledRepository):
     assert bender.source_type == "git"
 
 
-def test_load_platlib_package(repository: InstalledRepository):
+def test_load_platlib_package(repository: InstalledRepository) -> None:
     lib64 = get_package_from_repository("lib64", repository)
     assert lib64 is not None
     assert lib64.name == "lib64"
     assert lib64.version.text == "2.3.4"
 
 
-def test_load_editable_package(repository: InstalledRepository):
+def test_load_editable_package(repository: InstalledRepository) -> None:
     # test editable package with text .pth file
     editable = get_package_from_repository("editable", repository)
     assert editable is not None
@@ -181,7 +181,7 @@ def test_load_editable_package(repository: InstalledRepository):
     )
 
 
-def test_load_editable_with_import_package(repository: InstalledRepository):
+def test_load_editable_with_import_package(repository: InstalledRepository) -> None:
     # test editable package with executable .pth file
     editable = get_package_from_repository("editable-with-import", repository)
     assert editable is not None
@@ -191,7 +191,7 @@ def test_load_editable_with_import_package(repository: InstalledRepository):
     assert editable.source_url is None
 
 
-def test_load_standard_package_with_pth_file(repository: InstalledRepository):
+def test_load_standard_package_with_pth_file(repository: InstalledRepository) -> None:
     # test standard packages with .pth file is not treated as editable
     standard = get_package_from_repository("standard", repository)
     assert standard is not None
@@ -201,7 +201,7 @@ def test_load_standard_package_with_pth_file(repository: InstalledRepository):
     assert standard.source_url is None
 
 
-def test_load_pep_610_compliant_git_packages(repository: InstalledRepository):
+def test_load_pep_610_compliant_git_packages(repository: InstalledRepository) -> None:
     package = get_package_from_repository("git-pep-610", repository)
 
     assert package is not None
@@ -215,7 +215,7 @@ def test_load_pep_610_compliant_git_packages(repository: InstalledRepository):
 
 def test_load_pep_610_compliant_git_packages_no_requested_version(
     repository: InstalledRepository,
-):
+) -> None:
     package = get_package_from_repository(
         "git-pep-610-no-requested-version", repository
     )
@@ -234,7 +234,7 @@ def test_load_pep_610_compliant_git_packages_no_requested_version(
 
 def test_load_pep_610_compliant_git_packages_with_subdirectory(
     repository: InstalledRepository,
-):
+) -> None:
     package = get_package_from_repository("git-pep-610-subdirectory", repository)
     assert package is not None
     assert package.name == "git-pep-610-subdirectory"
@@ -246,7 +246,7 @@ def test_load_pep_610_compliant_git_packages_with_subdirectory(
     assert package.source_subdirectory == "subdir"
 
 
-def test_load_pep_610_compliant_url_packages(repository: InstalledRepository):
+def test_load_pep_610_compliant_url_packages(repository: InstalledRepository) -> None:
     package = get_package_from_repository("url-pep-610", repository)
 
     assert package is not None
@@ -259,7 +259,7 @@ def test_load_pep_610_compliant_url_packages(repository: InstalledRepository):
     )
 
 
-def test_load_pep_610_compliant_file_packages(repository: InstalledRepository):
+def test_load_pep_610_compliant_file_packages(repository: InstalledRepository) -> None:
     package = get_package_from_repository("file-pep-610", repository)
 
     assert package is not None
@@ -269,7 +269,9 @@ def test_load_pep_610_compliant_file_packages(repository: InstalledRepository):
     assert package.source_url == "/path/to/distributions/file-pep-610-1.2.3.tar.gz"
 
 
-def test_load_pep_610_compliant_directory_packages(repository: InstalledRepository):
+def test_load_pep_610_compliant_directory_packages(
+    repository: InstalledRepository,
+) -> None:
     package = get_package_from_repository("directory-pep-610", repository)
 
     assert package is not None
@@ -282,7 +284,7 @@ def test_load_pep_610_compliant_directory_packages(repository: InstalledReposito
 
 def test_load_pep_610_compliant_editable_directory_packages(
     repository: InstalledRepository,
-):
+) -> None:
     package = get_package_from_repository("editable-directory-pep-610", repository)
 
     assert package is not None

tests/utils/test_password_manager.py

@@ -20,7 +20,7 @@ if TYPE_CHECKING:
 
 def test_set_http_password(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     manager = PasswordManager(config)
 
     assert manager.keyring.is_available()
@@ -35,13 +35,14 @@ def test_set_http_password(
 
 def test_get_http_auth(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     dummy_keyring.set_password("poetry-repository-foo", "bar", "baz")
     config.auth_config_source.add_property("http-basic.foo", {"username": "bar"})
     manager = PasswordManager(config)
 
     assert manager.keyring.is_available()
     auth = manager.get_http_auth("foo")
+    assert auth is not None
 
     assert auth["username"] == "bar"
     assert auth["password"] == "baz"
@@ -49,7 +50,7 @@ def test_get_http_auth(
 
 def test_delete_http_password(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     dummy_keyring.set_password("poetry-repository-foo", "bar", "baz")
     config.auth_config_source.add_property("http-basic.foo", {"username": "bar"})
     manager = PasswordManager(config)
@@ -63,7 +64,7 @@ def test_delete_http_password(
 
 def test_set_pypi_token(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     manager = PasswordManager(config)
 
     assert manager.keyring.is_available()
@@ -76,7 +77,7 @@ def test_set_pypi_token(
 
 def test_get_pypi_token(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     dummy_keyring.set_password("poetry-repository-foo", "__token__", "baz")
     manager = PasswordManager(config)
 
@@ -86,7 +87,7 @@ def test_get_pypi_token(
 
 def test_delete_pypi_token(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     dummy_keyring.set_password("poetry-repository-foo", "__token__", "baz")
     manager = PasswordManager(config)
 
@@ -98,7 +99,7 @@ def test_delete_pypi_token(
 
 def test_set_http_password_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     manager = PasswordManager(config)
 
     assert not manager.keyring.is_available()
@@ -111,7 +112,7 @@ def test_set_http_password_with_unavailable_backend(
 
 def test_get_http_auth_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     config.auth_config_source.add_property(
         "http-basic.foo", {"username": "bar", "password": "baz"}
     )
@@ -119,6 +120,7 @@ def test_get_http_auth_with_unavailable_backend(
 
     assert not manager.keyring.is_available()
     auth = manager.get_http_auth("foo")
+    assert auth is not None
 
     assert auth["username"] == "bar"
     assert auth["password"] == "baz"
@@ -126,7 +128,7 @@ def test_get_http_auth_with_unavailable_backend(
 
 def test_delete_http_password_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     config.auth_config_source.add_property(
         "http-basic.foo", {"username": "bar", "password": "baz"}
     )
@@ -140,7 +142,7 @@ def test_delete_http_password_with_unavailable_backend(
 
 def test_set_pypi_token_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     manager = PasswordManager(config)
 
     assert not manager.keyring.is_available()
@@ -151,7 +153,7 @@ def test_set_pypi_token_with_unavailable_backend(
 
 def test_get_pypi_token_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     config.auth_config_source.add_property("pypi-token.foo", "baz")
     manager = PasswordManager(config)
 
@@ -161,7 +163,7 @@ def test_get_pypi_token_with_unavailable_backend(
 
 def test_delete_pypi_token_with_unavailable_backend(
     config: Config, with_fail_keyring: None
-):
+) -> None:
     config.auth_config_source.add_property("pypi-token.foo", "baz")
     manager = PasswordManager(config)
 
@@ -173,7 +175,7 @@ def test_delete_pypi_token_with_unavailable_backend(
 
 def test_keyring_raises_errors_on_keyring_errors(
     mocker: MockerFixture, with_fail_keyring: None
-):
+) -> None:
     mocker.patch("poetry.utils.password_manager.PoetryKeyring._check")
 
     key_ring = PoetryKeyring("poetry")
@@ -189,7 +191,7 @@ def test_keyring_raises_errors_on_keyring_errors(
 
 def test_keyring_with_chainer_backend_and_fail_keyring_should_be_unavailable(
     with_chained_fail_keyring: None,
-):
+) -> None:
     key_ring = PoetryKeyring("poetry")
 
     assert not key_ring.is_available()
@@ -197,7 +199,7 @@ def test_keyring_with_chainer_backend_and_fail_keyring_should_be_unavailable(
 
 def test_keyring_with_chainer_backend_and_null_keyring_should_be_unavailable(
     with_chained_null_keyring: None,
-):
+) -> None:
     key_ring = PoetryKeyring("poetry")
 
     assert not key_ring.is_available()
@@ -205,7 +207,7 @@ def test_keyring_with_chainer_backend_and_null_keyring_should_be_unavailable(
 
 def test_null_keyring_should_be_unavailable(
     with_null_keyring: None,
-):
+) -> None:
     key_ring = PoetryKeyring("poetry")
 
     assert not key_ring.is_available()
@@ -213,7 +215,7 @@ def test_null_keyring_should_be_unavailable(
 
 def test_fail_keyring_should_be_unavailable(
     with_fail_keyring: None,
-):
+) -> None:
     key_ring = PoetryKeyring("poetry")
 
     assert not key_ring.is_available()
@@ -221,13 +223,14 @@ def test_fail_keyring_should_be_unavailable(
 
 def test_get_http_auth_from_environment_variables(
     environ: None, config: Config, with_simple_keyring: None
-):
+) -> None:
     os.environ["POETRY_HTTP_BASIC_FOO_USERNAME"] = "bar"
     os.environ["POETRY_HTTP_BASIC_FOO_PASSWORD"] = "baz"
 
     manager = PasswordManager(config)
 
     auth = manager.get_http_auth("foo")
+    assert auth is not None
 
     assert auth["username"] == "bar"
     assert auth["password"] == "baz"
@@ -238,7 +241,7 @@ def test_get_pypi_token_with_env_var_positive(
     config: Config,
     with_simple_keyring: None,
     dummy_keyring: DummyBackend,
-):
+) -> None:
     sample_token = "sampletoken-1234"
     repo_name = "foo"
     manager = PasswordManager(config)
@@ -252,7 +255,7 @@ def test_get_pypi_token_with_env_var_positive(
 
 def test_get_pypi_token_with_env_var_not_available(
     config: Config, with_simple_keyring: None, dummy_keyring: DummyBackend
-):
+) -> None:
     repo_name = "foo"
     manager = PasswordManager(config)