bpo-45162: Remove many old deprecated unittest features (GH-28268)

* "fail*" and "assert*" aliases of TestCase methods.
* Broken from start TestCase method assertDictContainsSubset().
* Ignored TestLoader.loadTestsFromModule() parameter use_load_tests.
* Old alias _TextTestResult of TextTestResult.

Doc/library/unittest.rst

@@ -1237,9 +1237,6 @@ Test cases
          :meth:`.assertRegex`.
       .. versionadded:: 3.2
          :meth:`.assertNotRegex`.
-      .. versionadded:: 3.5
-         The name ``assertNotRegexpMatches`` is a deprecated alias
-         for :meth:`.assertNotRegex`.
 
 
    .. method:: assertCountEqual(first, second, msg=None)
@@ -1605,40 +1602,6 @@ Test cases
    :mod:`unittest`-based test framework.
 
 
-.. _deprecated-aliases:
-
-Deprecated aliases
-##################
-
-For historical reasons, some of the :class:`TestCase` methods had one or more
-aliases that are now deprecated.  The following table lists the correct names
-along with their deprecated aliases:
-
-   ==============================  ====================== =======================
-    Method Name                     Deprecated alias       Deprecated alias
-   ==============================  ====================== =======================
-    :meth:`.assertEqual`            failUnlessEqual        assertEquals
-    :meth:`.assertNotEqual`         failIfEqual            assertNotEquals
-    :meth:`.assertTrue`             failUnless             assert\_
-    :meth:`.assertFalse`            failIf
-    :meth:`.assertRaises`           failUnlessRaises
-    :meth:`.assertAlmostEqual`      failUnlessAlmostEqual  assertAlmostEquals
-    :meth:`.assertNotAlmostEqual`   failIfAlmostEqual      assertNotAlmostEquals
-    :meth:`.assertRegex`                                   assertRegexpMatches
-    :meth:`.assertNotRegex`                                assertNotRegexpMatches
-    :meth:`.assertRaisesRegex`                             assertRaisesRegexp
-   ==============================  ====================== =======================
-
-   .. deprecated:: 3.1
-         The fail* aliases listed in the second column have been deprecated.
-   .. deprecated:: 3.2
-         The assert* aliases listed in the third column have been deprecated.
-   .. deprecated:: 3.2
-         ``assertRegexpMatches`` and ``assertRaisesRegexp`` have been renamed to
-         :meth:`.assertRegex` and :meth:`.assertRaisesRegex`.
-   .. deprecated:: 3.5
-         The ``assertNotRegexpMatches`` name is deprecated in favor of :meth:`.assertNotRegex`.
-
 .. _testsuite-objects:
 
 Grouping tests
@@ -1764,7 +1727,7 @@ Loading and running tests
       case is created for that method instead.
 
 
-   .. method:: loadTestsFromModule(module, pattern=None)
+   .. method:: loadTestsFromModule(module, *, pattern=None)
 
       Return a suite of all test cases contained in the given module. This
       method searches *module* for classes derived from :class:`TestCase` and
@@ -1788,10 +1751,11 @@ Loading and running tests
          Support for ``load_tests`` added.
 
       .. versionchanged:: 3.5
-         The undocumented and unofficial *use_load_tests* default argument is
-         deprecated and ignored, although it is still accepted for backward
-         compatibility.  The method also now accepts a keyword-only argument
-         *pattern* which is passed to ``load_tests`` as the third argument.
+         Support for a keyword-only argument *pattern* has been added.
+
+      .. versionchanged:: 3.11
+         The undocumented and unofficial *use_load_tests* parameter has been
+         removed.
 
 
    .. method:: loadTestsFromName(name, module=None)
@@ -2144,8 +2108,6 @@ Loading and running tests
    :class:`TextTestRunner`.
 
    .. versionadded:: 3.2
-      This class was previously named ``_TextTestResult``. The old name still
-      exists as an alias but is deprecated.
 
 
 .. data:: defaultTestLoader
@@ -2168,10 +2130,7 @@ Loading and running tests
    By default this runner shows :exc:`DeprecationWarning`,
    :exc:`PendingDeprecationWarning`, :exc:`ResourceWarning` and
    :exc:`ImportWarning` even if they are :ref:`ignored by default
-   <warning-ignored>`. Deprecation warnings caused by :ref:`deprecated unittest
-   methods <deprecated-aliases>` are also special-cased and, when the warning
-   filters are ``'default'`` or ``'always'``, they will appear only once
-   per-module, in order to avoid too many warning messages.  This behavior can
+   <warning-ignored>`.  This behavior can
    be overridden using Python's :option:`!-Wd` or :option:`!-Wa` options
    (see :ref:`Warning control <using-on-warnings>`) and leaving
    *warnings* to ``None``.

Doc/whatsnew/3.11.rst

@@ -277,6 +277,28 @@ Removed
   and :class:`fileinput.FileInput`, deprecated since Python 3.9.
   (Contributed by Hugo van Kemenade in :issue:`45132`.)
 
+* Removed many old deprecated :mod:`unittest` features:
+
+  - :class:`~unittest.TestCase` method aliases ``failUnlessEqual``,
+    ``failIfEqual``, ``failUnless``, ``failIf``, ``failUnlessRaises``,
+    ``failUnlessAlmostEqual``, ``failIfAlmostEqual`` (deprecated in Python 3.1),
+    ``assertEquals``, ``assertNotEquals``, ``assert_``, ``assertAlmostEquals``,
+    ``assertNotAlmostEquals``, ``assertRegexpMatches``, ``assertRaisesRegexp``
+    (deprecated in Python 3.2), and ``assertNotRegexpMatches`` (deprecated in
+    Python 3.5).
+
+  - Undocumented and broken :class:`~unittest.TestCase` method
+    ``assertDictContainsSubset`` (deprecated in Python 3.2).
+
+  - Undocumented :meth:`<unittest.TestLoader.loadTestsFromModule>
+    TestLoader.loadTestsFromModule` parameter *use_load_tests* (deprecated
+    and ignored since Python 3.2).
+
+  - An alias of the :class:`~unittest.TextTestResult` class:
+    ``_TextTestResult`` (deprecated in Python 3.2).
+
+  (Contributed by Serhiy Storchaka in :issue:`45162`.)
+
 * The following deprecated functions and methods are removed in the :mod:`gettext`
   module: :func:`~gettext.lgettext`, :func:`~gettext.ldgettext`,
   :func:`~gettext.lngettext` and :func:`~gettext.ldngettext`.

Doc/whatsnew/3.2.rst

@@ -1815,8 +1815,7 @@ names.
    ===============================   ==============================
 
   Likewise, the ``TestCase.fail*`` methods deprecated in Python 3.1 are expected
-  to be removed in Python 3.3.  Also see the :ref:`deprecated-aliases` section in
-  the :mod:`unittest` documentation.
+  to be removed in Python 3.3.
 
   (Contributed by Ezio Melotti; :issue:`9424`.)
 

Lib/unittest/__init__.py

@@ -68,9 +68,6 @@ def testMultiply(self):
 # IsolatedAsyncioTestCase will be imported lazily.
 from .loader import makeSuite, getTestCaseNames, findTestCases
 
-# deprecated
-_TextTestResult = TextTestResult
-
 
 # There are no tests here, so don't try to run anything discovered from
 # introspecting the symbols (e.g. FunctionTestCase). Instead, all our

Lib/unittest/case.py

@@ -1137,35 +1137,6 @@ def assertDictEqual(self, d1, d2, msg=None):
             standardMsg = self._truncateMessage(standardMsg, diff)
             self.fail(self._formatMessage(msg, standardMsg))
 
-    def assertDictContainsSubset(self, subset, dictionary, msg=None):
-        """Checks whether dictionary is a superset of subset."""
-        warnings.warn('assertDictContainsSubset is deprecated',
-                      DeprecationWarning)
-        missing = []
-        mismatched = []
-        for key, value in subset.items():
-            if key not in dictionary:
-                missing.append(key)
-            elif value != dictionary[key]:
-                mismatched.append('%s, expected: %s, actual: %s' %
-                                  (safe_repr(key), safe_repr(value),
-                                   safe_repr(dictionary[key])))
-
-        if not (missing or mismatched):
-            return
-
-        standardMsg = ''
-        if missing:
-            standardMsg = 'Missing: %s' % ','.join(safe_repr(m) for m in
-                                                    missing)
-        if mismatched:
-            if standardMsg:
-                standardMsg += '; '
-            standardMsg += 'Mismatched values: %s' % ','.join(mismatched)
-
-        self.fail(self._formatMessage(msg, standardMsg))
-
-
     def assertCountEqual(self, first, second, msg=None):
         """Asserts that two iterables have the same elements, the same number of
         times, without regard to order.
@@ -1329,27 +1300,6 @@ def assertNotRegex(self, text, unexpected_regex, msg=None):
             raise self.failureException(msg)
 
 
-    def _deprecate(original_func):
-        def deprecated_func(*args, **kwargs):
-            warnings.warn(
-                'Please use {0} instead.'.format(original_func.__name__),
-                DeprecationWarning, 2)
-            return original_func(*args, **kwargs)
-        return deprecated_func
-
-    # see #9424
-    failUnlessEqual = assertEquals = _deprecate(assertEqual)
-    failIfEqual = assertNotEquals = _deprecate(assertNotEqual)
-    failUnlessAlmostEqual = assertAlmostEquals = _deprecate(assertAlmostEqual)
-    failIfAlmostEqual = assertNotAlmostEquals = _deprecate(assertNotAlmostEqual)
-    failUnless = assert_ = _deprecate(assertTrue)
-    failUnlessRaises = _deprecate(assertRaises)
-    failIf = _deprecate(assertFalse)
-    assertRaisesRegexp = _deprecate(assertRaisesRegex)
-    assertRegexpMatches = _deprecate(assertRegex)
-    assertNotRegexpMatches = _deprecate(assertNotRegex)
-
-
 
 class FunctionTestCase(TestCase):
     """A test case that wraps a test function.

Lib/unittest/loader.py

@@ -93,30 +93,8 @@ def loadTestsFromTestCase(self, testCaseClass):
         loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
         return loaded_suite
 
-    # XXX After Python 3.5, remove backward compatibility hacks for
-    # use_load_tests deprecation via *args and **kws.  See issue 16662.
-    def loadTestsFromModule(self, module, *args, pattern=None, **kws):
+    def loadTestsFromModule(self, module, *, pattern=None):
         """Return a suite of all test cases contained in the given module"""
-        # This method used to take an undocumented and unofficial
-        # use_load_tests argument.  For backward compatibility, we still
-        # accept the argument (which can also be the first position) but we
-        # ignore it and issue a deprecation warning if it's present.
-        if len(args) > 0 or 'use_load_tests' in kws:
-            warnings.warn('use_load_tests is deprecated and ignored',
-                          DeprecationWarning)
-            kws.pop('use_load_tests', None)
-        if len(args) > 1:
-            # Complain about the number of arguments, but don't forget the
-            # required `module` argument.
-            complaint = len(args) + 1
-            raise TypeError('loadTestsFromModule() takes 1 positional argument but {} were given'.format(complaint))
-        if len(kws) != 0:
-            # Since the keyword arguments are unsorted (see PEP 468), just
-            # pick the alphabetically sorted first argument to complain about,
-            # if multiple were given.  At least the error message will be
-            # predictable.
-            complaint = sorted(kws)[0]
-            raise TypeError("loadTestsFromModule() got an unexpected keyword argument '{}'".format(complaint))
         tests = []
         for name in dir(module):
             obj = getattr(module, name)

Lib/unittest/runner.py

@@ -189,15 +189,6 @@ def run(self, test):
             if self.warnings:
                 # if self.warnings is set, use it to filter all the warnings
                 warnings.simplefilter(self.warnings)
-                # if the filter is 'default' or 'always', special-case the
-                # warnings from the deprecated unittest methods to show them
-                # no more than once per module, because they can be fairly
-                # noisy.  The -Wd and -Wa flags can be used to bypass this
-                # only when self.warnings is None.
-                if self.warnings in ['default', 'always']:
-                    warnings.filterwarnings('module',
-                            category=DeprecationWarning,
-                            message=r'Please use assert\w+ instead.')
             startTime = time.perf_counter()
             startTestRun = getattr(result, 'startTestRun', None)
             if startTestRun is not None:

Lib/unittest/test/_test_warnings.py

@@ -18,17 +18,6 @@ def warnfun():
     warnings.warn('rw', RuntimeWarning)
 
 class TestWarnings(unittest.TestCase):
-    # unittest warnings will be printed at most once per type (max one message
-    # for the fail* methods, and one for the assert* methods)
-    def test_assert(self):
-        self.assertEquals(2+2, 4)
-        self.assertEquals(2*2, 4)
-        self.assertEquals(2**2, 4)
-
-    def test_fail(self):
-        self.failUnless(1)
-        self.failUnless(True)
-
     def test_other_unittest(self):
         self.assertAlmostEqual(2+2, 4)
         self.assertNotAlmostEqual(4+4, 2)

Lib/unittest/test/test_assertions.py

@@ -271,15 +271,6 @@ def testAssertDictEqual(self):
                              r"\+ \{'key': 'value'\}$",
                              r"\+ \{'key': 'value'\} : oops$"])
 
-    def testAssertDictContainsSubset(self):
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore", DeprecationWarning)
-
-            self.assertMessages('assertDictContainsSubset', ({'key': 'value'}, {}),
-                                ["^Missing: 'key'$", "^oops$",
-                                 "^Missing: 'key'$",
-                                 "^Missing: 'key' : oops$"])
-
     def testAssertMultiLineEqual(self):
         self.assertMessages('assertMultiLineEqual', ("", "foo"),
                             [r"\+ foo$", "^oops$",

Lib/unittest/test/test_case.py

@@ -696,36 +696,6 @@ def testAssertIn(self):
         self.assertRaises(self.failureException, self.assertNotIn, 'cow',
                           animals)
 
-    def testAssertDictContainsSubset(self):
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore", DeprecationWarning)
-
-            self.assertDictContainsSubset({}, {})
-            self.assertDictContainsSubset({}, {'a': 1})
-            self.assertDictContainsSubset({'a': 1}, {'a': 1})
-            self.assertDictContainsSubset({'a': 1}, {'a': 1, 'b': 2})
-            self.assertDictContainsSubset({'a': 1, 'b': 2}, {'a': 1, 'b': 2})
-
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({1: "one"}, {})
-
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({'a': 2}, {'a': 1})
-
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({'c': 1}, {'a': 1})
-
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({'a': 1, 'c': 1}, {'a': 1})
-
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({'a': 1, 'c': 1}, {'a': 1})
-
-            one = ''.join(chr(i) for i in range(255))
-            # this used to cause a UnicodeDecodeError constructing the failure msg
-            with self.assertRaises(self.failureException):
-                self.assertDictContainsSubset({'foo': one}, {'foo': '\uFFFD'})
-
     def testAssertEqual(self):
         equal_pairs = [
                 ((), ()),
@@ -1788,45 +1758,18 @@ def testAssertNoLogsYieldsNone(self):
             pass
         self.assertIsNone(value)
 
-    def testDeprecatedMethodNames(self):
-        """
-        Test that the deprecated methods raise a DeprecationWarning. See #9424.
-        """
-        old = (
-            (self.failIfEqual, (3, 5)),
-            (self.assertNotEquals, (3, 5)),
-            (self.failUnlessEqual, (3, 3)),
-            (self.assertEquals, (3, 3)),
-            (self.failUnlessAlmostEqual, (2.0, 2.0)),
-            (self.assertAlmostEquals, (2.0, 2.0)),
-            (self.failIfAlmostEqual, (3.0, 5.0)),
-            (self.assertNotAlmostEquals, (3.0, 5.0)),
-            (self.failUnless, (True,)),
-            (self.assert_, (True,)),
-            (self.failUnlessRaises, (TypeError, lambda _: 3.14 + 'spam')),
-            (self.failIf, (False,)),
-            (self.assertDictContainsSubset, (dict(a=1, b=2), dict(a=1, b=2, c=3))),
-            (self.assertRaisesRegexp, (KeyError, 'foo', lambda: {}['foo'])),
-            (self.assertRegexpMatches, ('bar', 'bar')),
-        )
-        for meth, args in old:
-            with self.assertWarns(DeprecationWarning):
-                meth(*args)
-
-    # disable this test for now. When the version where the fail* methods will
-    # be removed is decided, re-enable it and update the version
-    def _testDeprecatedFailMethods(self):
-        """Test that the deprecated fail* methods get removed in 3.x"""
-        if sys.version_info[:2] < (3, 3):
-            return
+    def testDeprecatedFailMethods(self):
+        """Test that the deprecated fail* methods get removed in 3.11"""
         deprecated_names = [
             'failIfEqual', 'failUnlessEqual', 'failUnlessAlmostEqual',
             'failIfAlmostEqual', 'failUnless', 'failUnlessRaises', 'failIf',
-            'assertDictContainsSubset',
+            'assertNotEquals', 'assertEquals', 'assertAlmostEquals',
+            'assertNotAlmostEquals', 'assert_', 'assertDictContainsSubset',
+            'assertRaisesRegexp', 'assertRegexpMatches'
         ]
         for deprecated_name in deprecated_names:
             with self.assertRaises(AttributeError):
-                getattr(self, deprecated_name)  # remove these in 3.x
+                getattr(self, deprecated_name)
 
     def testDeepcopy(self):
         # Issue: 5660