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.venv/Lib/site-packages/_pytest/setupplan.py

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+from typing import Optional
+from typing import Union
+
+import pytest
+from _pytest.config import Config
+from _pytest.config import ExitCode
+from _pytest.config.argparsing import Parser
+from _pytest.fixtures import FixtureDef
+from _pytest.fixtures import SubRequest
+
+
+def pytest_addoption(parser: Parser) -> None:
+    group = parser.getgroup("debugconfig")
+    group.addoption(
+        "--setupplan",
+        "--setup-plan",
+        action="store_true",
+        help="show what fixtures and tests would be executed but "
+        "don't execute anything.",
+    )
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_fixture_setup(
+    fixturedef: FixtureDef[object], request: SubRequest
+) -> Optional[object]:
+    # Will return a dummy fixture if the setuponly option is provided.
+    if request.config.option.setupplan:
+        my_cache_key = fixturedef.cache_key(request)
+        fixturedef.cached_result = (None, my_cache_key, None)
+        return fixturedef.cached_result
+    return None
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_cmdline_main(config: Config) -> Optional[Union[int, ExitCode]]:
+    if config.option.setupplan:
+        config.option.setuponly = True
+        config.option.setupshow = True
+    return None