python · mth4saurabh · Apr 30, 2025 · Apr 30, 2025 · Apr 30, 2025 · Apr 30, 2025
diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
@@ -1038,7 +1038,7 @@ There are two main functions for creating :class:`unittest.TestSuite` instances
 from text files and modules with doctests:
 
 
-.. function:: DocFileSuite(*paths, module_relative=True, package=None, setUp=None, tearDown=None, globs=None, optionflags=0, parser=DocTestParser(), encoding=None)
+.. function:: DocFileSuite(*paths, module_relative=True, package=None, setUp=None, tearDown=None, globs=None, optionflags=0, parser=DocTestParser(), encoding=None, test_case=DocFileCase, runner=DocTestRunner)
 
    Convert doctest tests from one or more text files to a
    :class:`unittest.TestSuite`.
@@ -1102,11 +1102,24 @@ from text files and modules with doctests:
    Optional argument *encoding* specifies an encoding that should be used to
    convert the file to unicode.
 
+   Optional argument *test_case* specifies the :class:`!DocFileCase` class (or a
+   subclass) that should be used to create test cases. By default, :class:`!DocFileCase`
+   is used. This allows for custom test case classes that can add additional behavior
+   or attributes to the test cases.
+
+   Optional argument *runner* specifies the :class:`DocTestRunner` class (or a
+   subclass) that should be used to run the tests. By default, :class:`DocTestRunner`
+   is used.
+
    The global ``__file__`` is added to the globals provided to doctests loaded
    from a text file using :func:`DocFileSuite`.
 
+   .. versionchanged:: 3.13
+      Added *test_case* and *runner* parameters to support user specified test case
+      and runner in DocFileSuite.
+
 
-.. function:: DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None, setUp=None, tearDown=None, optionflags=0, checker=None)
+.. function:: DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None, setUp=None, tearDown=None, optionflags=0, checker=None, test_case=DocTestCase, runner=DocTestRunner)
 
    Convert doctest tests for a module to a :class:`unittest.TestSuite`.
 
@@ -1134,12 +1147,25 @@ from text files and modules with doctests:
    Optional arguments *setUp*, *tearDown*, and *optionflags* are the same as for
    function :func:`DocFileSuite` above.
 
+   Optional argument *test_case* specifies the :class:`!DocTestCase` class (or a
+   subclass) that should be used to create test cases. By default, :class:`!DocTestCase`
+   is used. This allows for custom test case classes that can add additional behavior
+   or attributes to the test cases.
+
+   Optional argument *runner* specifies the :class:`DocTestRunner` class (or a
+   subclass) that should be used to run the tests. By default, :class:`DocTestRunner`
+   is used.
+
    This function uses the same search technique as :func:`testmod`.
 
    .. versionchanged:: 3.5
       :func:`DocTestSuite` returns an empty :class:`unittest.TestSuite` if *module*
       contains no docstrings instead of raising :exc:`ValueError`.
 
+   .. versionchanged:: 3.13
+      Added *runner* and *test_case* parameters to support custom test runners
+      and test case classes in DocTestSuite.
+
 .. exception:: failureException
 
    When doctests which have been converted to unit tests by :func:`DocFileSuite`

diff --git a/Lib/doctest.py b/Lib/doctest.py
@@ -2275,14 +2275,15 @@ def set_unittest_reportflags(flags):
 class DocTestCase(unittest.TestCase):
 
     def __init__(self, test, optionflags=0, setUp=None, tearDown=None,
-                 checker=None):
+                 checker=None, runner=DocTestRunner):
 
         unittest.TestCase.__init__(self)
         self._dt_optionflags = optionflags
         self._dt_checker = checker
         self._dt_test = test
         self._dt_setUp = setUp
         self._dt_tearDown = tearDown
+        self._dt_runner = runner
 
     def setUp(self):
         test = self._dt_test
@@ -2312,7 +2313,7 @@ def runTest(self):
             # so add the default reporting flags
             optionflags |= _unittest_reportflags
 
-        runner = DocTestRunner(optionflags=optionflags,
+        runner = self._dt_runner(optionflags=optionflags,
                                checker=self._dt_checker, verbose=False)
 
         try:
@@ -2460,7 +2461,7 @@ def _removeTestAtIndex(self, index):
 
 
 def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
-                 **options):
+                 test_case=DocTestCase, runner=DocTestRunner, **options):
     """
     Convert doctest tests for a module to a unittest test suite.
 
@@ -2494,6 +2495,12 @@ def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
 
     optionflags
        A set of doctest option flags expressed as an integer.
+
+    test_case
+       A custom optional DocTestCase class to use for test cases.
+
+    runner
+       A custom optional DocTestRunner class to use for running tests.
     """
 
     if test_finder is None:
@@ -2519,7 +2526,7 @@ def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
             if filename[-4:] == ".pyc":
                 filename = filename[:-1]
             test.filename = filename
-        suite.addTest(DocTestCase(test, **options))
+        suite.addTest(test_case(test, runner=runner, **options))
 
     return suite
 
@@ -2538,7 +2545,8 @@ def format_failure(self, err):
 
 def DocFileTest(path, module_relative=True, package=None,
                 globs=None, parser=DocTestParser(),
-                encoding=None, **options):
+                encoding=None, test_case=DocFileCase,
+                runner=DocTestRunner, **options):
     if globs is None:
         globs = {}
     else:
@@ -2560,7 +2568,7 @@ def DocFileTest(path, module_relative=True, package=None,
 
     # Convert it to a test, and wrap it in a DocFileCase.
     test = parser.get_doctest(doc, globs, name, path, 0)
-    return DocFileCase(test, **options)
+    return test_case(test, runner=runner, **options)
 
 def DocFileSuite(*paths, **kw):
     """A unittest suite for one or more doctest files.
@@ -2617,6 +2625,12 @@ def DocFileSuite(*paths, **kw):
 
     encoding
       An encoding that will be used to convert the files to unicode.
+
+    test_case
+      A custom DocFileCase subclass to use for the tests.
+
+    runner
+      A custom DocTestRunner subclass to use for running the tests.
     """
     suite = _DocTestSuite()
 
@@ -2626,8 +2640,17 @@ def DocFileSuite(*paths, **kw):
     if kw.get('module_relative', True):
         kw['package'] = _normalize_module(kw.get('package'))
 
+    test_case = kw.pop('test_case', DocFileCase)
+    runner = kw.pop('runner', DocTestRunner)
+
     for path in paths:
-        suite.addTest(DocFileTest(path, **kw))
+        test_instance = DocFileTest(
+            path=path,
+            test_case=test_case,
+            runner=runner,
+            **kw
+        )
+        suite.addTest(test_instance)
 
     return suite
 

diff --git a/Lib/test/test_doctest/test_doctest.py b/Lib/test/test_doctest/test_doctest.py
@@ -2383,6 +2383,36 @@ def test_DocTestSuite():
        modified the test globals, which are a copy of the
        sample_doctest module dictionary.  The test globals are
        automatically cleared for us after a test.
+
+       We can also provide a custom test case class:
+
+         >>> class CustomDocTestCase(doctest.DocTestCase):
+         ...     def __init__(self, test, **options):
+         ...         super().__init__(test, **options)
+         ...         self.custom_attr = "custom_value"
+         ...     def runTest(self):
+         ...         self.assertEqual(self.custom_attr, "custom_value")
+         ...         super().runTest()
+
+         >>> suite = doctest.DocTestSuite('test.test_doctest.sample_doctest',
+         ...                              test_case=CustomDocTestCase)
+         >>> result = suite.run(unittest.TestResult())
+         >>> result
+         <unittest.result.TestResult run=9 errors=0 failures=4>
+
+       We can also provide both a custom test case class and a custom runner class:
+
+         >>> class CustomDocTestRunner(doctest.DocTestRunner):
+         ...     def __init__(self, **options):
+         ...         super().__init__(**options)
+         ...         self.custom_attr = "custom_runner"
+         >>> suite = doctest.DocTestSuite('test.test_doctest.sample_doctest',
+         ...                              test_case=CustomDocTestCase,
+         ...                              runner=CustomDocTestRunner)
+         >>> result = suite.run(unittest.TestResult())
+         >>> result
+         <unittest.result.TestResult run=9 errors=0 failures=4>
+
        """
 
 def test_DocFileSuite():
@@ -2543,6 +2573,38 @@ def test_DocFileSuite():
          >>> suite.run(unittest.TestResult())
          <unittest.result.TestResult run=3 errors=0 failures=2>
 
+       We can also provide a custom test case class:
+
+         >>> class CustomDocTestCase(doctest.DocFileCase):
+         ...     def __init__(self, test, **options):
+         ...         super().__init__(test, **options)
+         ...         self.custom_attr = "custom_value"
+         ...     def runTest(self):
+         ...         self.assertEqual(self.custom_attr, "custom_value")
+         ...         super().runTest()
+
+         >>> suite = doctest.DocFileSuite('test_doctest.txt',
+         ...                              globs={'favorite_color': 'blue'},
+         ...                              test_case=CustomDocTestCase)
+         >>> result = suite.run(unittest.TestResult())
+         >>> result
+         <unittest.result.TestResult run=1 errors=0 failures=0>
+
+       We can also provide both a custom test case class and a custom runner class:
+
+         >>> class CustomDocTestRunner(doctest.DocTestRunner):
+         ...     def __init__(self, **options):
+         ...         super().__init__(**options)
+         ...         self.custom_attr = "custom_runner"
+
+         >>> suite = doctest.DocFileSuite('test_doctest.txt',
+         ...                              globs={'favorite_color': 'blue'},
+         ...                              test_case=CustomDocTestCase,
+         ...                              runner=CustomDocTestRunner)
+         >>> result = suite.run(unittest.TestResult())
+         >>> result
+         <unittest.result.TestResult run=1 errors=0 failures=0>
+
        """
 
 def test_trailing_space_in_test():

diff --git a/Misc/NEWS.d/next/Library/2025-04-30-12-01-45.gh-issue-43657.YzJLCZ.rst b/Misc/NEWS.d/next/Library/2025-04-30-12-01-45.gh-issue-43657.YzJLCZ.rst
@@ -0,0 +1 @@
+Add support for custom test case and runner classes in :func:`doctest.DocTestSuite` and :func:`doctest.DocFileSuite`. This allows users to extend doctest functionality by providing their own test case and runner implementations through the new ``test_case`` and ``runner`` parameters.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Add support for custom test case and runner classes in :func:`doctest.DocTestSuite` and :func:`doctest.DocFileSuite`. This allows users to extend doctest functionality by providing their own test case and runner implementations through the new ``test_case`` and ``runner`` parameters.