Deprecate --strict (#7985)

Fix #7530

changelog/7530.deprecation.rst

@@ -0,0 +1,4 @@
+The ``--strict`` command-line option has been deprecated, use ``--strict-markers`` instead.
+
+We have plans to maybe in the future to reintroduce ``--strict`` and make it an encompassing flag for all strictness
+related options (``--strict-markers`` and ``--strict-config`` at the moment, more might be introduced in the future).

doc/en/deprecations.rst

@@ -18,6 +18,19 @@ Deprecated Features
 Below is a complete list of all pytest features which are considered deprecated. Using those features will issue
 :class:`PytestWarning` or subclasses, which can be filtered using :ref:`standard warning filters <warnings>`.
 
+The ``--strict`` command-line option
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. deprecated:: 6.2
+
+The ``--strict`` command-line option has been deprecated in favor of ``--strict-markers``, which
+better conveys what the option does.
+
+We have plans to maybe in the future to reintroduce ``--strict`` and make it an encompassing
+flag for all strictness related options (``--strict-markers`` and ``--strict-config``
+at the moment, more might be introduced in the future).
+
+
 
 The ``pytest_warning_captured`` hook
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/_pytest/config/__init__.py

@@ -1177,6 +1177,11 @@ class Config:
         self._validate_plugins()
         self._warn_about_skipped_plugins()
 
+        if self.known_args_namespace.strict:
+            self.issue_config_time_warning(
+                _pytest.deprecated.STRICT_OPTION, stacklevel=2
+            )
+
         if self.known_args_namespace.confcutdir is None and self.inipath is not None:
             confcutdir = str(self.inipath.parent)
             self.known_args_namespace.confcutdir = confcutdir

src/_pytest/deprecated.py

@@ -51,3 +51,7 @@ FSCOLLECTOR_GETHOOKPROXY_ISINITPATH = PytestDeprecationWarning(
     "The gethookproxy() and isinitpath() methods of FSCollector and Package are deprecated; "
     "use self.session.gethookproxy() and self.session.isinitpath() instead. "
 )
+
+STRICT_OPTION = PytestDeprecationWarning(
+    "The --strict option is deprecated, use --strict-markers instead."
+)

src/_pytest/main.py

@@ -101,10 +101,12 @@ def pytest_addoption(parser: Parser) -> None:
     )
     group._addoption(
         "--strict-markers",
-        "--strict",
         action="store_true",
         help="markers not registered in the `markers` section of the configuration file raise errors.",
     )
+    group._addoption(
+        "--strict", action="store_true", help="(deprecated) alias to --strict-markers.",
+    )
     group._addoption(
         "-c",
         metavar="file",

src/_pytest/mark/structures.py

@@ -496,7 +496,7 @@ class MarkGenerator:
             # If the name is not in the set of known marks after updating,
             # then it really is time to issue a warning or an error.
             if name not in self._markers:
-                if self._config.option.strict_markers:
+                if self._config.option.strict_markers or self._config.option.strict:
                     fail(
                         f"{name!r} not found in `markers` configuration option",
                         pytrace=False,

testing/deprecated_test.py

@@ -4,6 +4,7 @@ from unittest import mock
 
 import pytest
 from _pytest import deprecated
+from _pytest.pytester import Pytester
 from _pytest.pytester import Testdir
 
 
@@ -95,3 +96,22 @@ def test_fscollector_gethookproxy_isinitpath(testdir: Testdir) -> None:
         session.gethookproxy(testdir.tmpdir)
         session.isinitpath(testdir.tmpdir)
     assert len(rec) == 0
+
+
+def test_strict_option_is_deprecated(pytester: Pytester) -> None:
+    """--strict is a deprecated alias to --strict-markers (#7530)."""
+    pytester.makepyfile(
+        """
+        import pytest
+
+        @pytest.mark.unknown
+        def test_foo(): pass
+        """
+    )
+    result = pytester.runpytest("--strict")
+    result.stdout.fnmatch_lines(
+        [
+            "'unknown' not found in `markers` configuration option",
+            "*PytestDeprecationWarning: The --strict option is deprecated, use --strict-markers instead.",
+        ]
+    )