Do not fail on Python 3.12 when there are tests but all skipped.

This follows the same change in Python itself from python/cpython#113661.

PiperOrigin-RevId: 597654135

CHANGELOG.md

@@ -21,6 +21,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com).
 *   (flags) `absl.flags.argparse_flags.ArgumentParser` now correctly inherits
     an empty instance of `FlagValues` to ensure that absl flags, such as
     `--flagfile`, `--undefok` are supported.
+*   (testing) Do not exit 5 if tests were skipped on Python 3.12. This follows
+    the CPython change in https://github.com/python/cpython/pull/113856.
 
 ### Fixed
 

absl/testing/BUILD

@@ -197,7 +197,10 @@ py_test(
     name = "tests/absltest_test",
     size = "small",
     srcs = ["tests/absltest_test.py"],
-    data = [":tests/absltest_test_helper"],
+    data = [
+        ":tests/absltest_test_helper",
+        ":tests/absltest_test_helper_skipped",
+    ],
     python_version = "PY3",
     srcs_version = "PY3",
     deps = [
@@ -221,6 +224,13 @@ py_binary(
     ],
 )
 
+py_binary(
+    name = "tests/absltest_test_helper_skipped",
+    testonly = 1,
+    srcs = ["tests/absltest_test_helper_skipped.py"],
+    deps = [":absltest"],
+)
+
 py_test(
     name = "tests/flagsaver_test",
     srcs = ["tests/flagsaver_test.py"],

absl/testing/absltest.py

@@ -2689,9 +2689,9 @@ def run_tests(
   result, fail_when_no_tests_ran = _run_and_get_tests_result(
       argv, args, kwargs, xml_reporter.TextAndXMLTestRunner
   )
-  if fail_when_no_tests_ran and result.testsRun == 0:
-    # Python 3.12 unittest exits with 5 when no tests ran. The code comes from
-    # pytest which does the same thing.
+  if fail_when_no_tests_ran and result.testsRun == 0 and not result.skipped:
+    # Python 3.12 unittest exits with 5 when no tests ran. The exit code 5 comes
+    # from pytest which does the same thing.
     sys.exit(5)
   sys.exit(not result.wasSuccessful())
 

absl/testing/tests/absltest_test.py

@@ -24,6 +24,7 @@
 import stat
 import string
 import subprocess
+import sys
 import tempfile
 import textwrap
 from typing import Optional
@@ -37,11 +38,18 @@
 
 class BaseTestCase(absltest.TestCase):
 
-  def _get_helper_exec_path(self):
-    helper = 'absl/testing/tests/absltest_test_helper'
+  def _get_helper_exec_path(self, helper_name):
+    helper = 'absl/testing/tests/' + helper_name
     return _bazelize_command.get_executable_path(helper)
 
-  def run_helper(self, test_id, args, env_overrides, expect_success):
+  def run_helper(
+      self,
+      test_id,
+      args,
+      env_overrides,
+      expect_success,
+      helper_name=None,
+  ):
     env = absltest_env.inherited_env()
     for key, value in env_overrides.items():
       if value is None:
@@ -50,8 +58,12 @@ def run_helper(self, test_id, args, env_overrides, expect_success):
       else:
         env[key] = value
 
-    command = [self._get_helper_exec_path(),
-               '--test_id={}'.format(test_id)] + args
+    if helper_name is None:
+      helper_name = 'absltest_test_helper'
+    command = [self._get_helper_exec_path(helper_name)]
+    if test_id is not None:
+      command.append('--test_id={}'.format(test_id))
+    command.extend(args)
     process = subprocess.Popen(
         command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env,
         universal_newlines=True)
@@ -66,15 +78,22 @@ def run_helper(self, test_id, args, env_overrides, expect_success):
           1, process.returncode,
           'Expected failure, but succeeded with '
           'stdout:\n{}\nstderr:\n{}\n'.format(stdout, stderr))
-    return stdout, stderr
+    return stdout, stderr, process.returncode
 
 
 class TestCaseTest(BaseTestCase):
   longMessage = True
 
-  def run_helper(self, test_id, args, env_overrides, expect_success):
-    return super(TestCaseTest, self).run_helper(test_id, args + ['HelperTest'],
-                                                env_overrides, expect_success)
+  def run_helper(
+      self, test_id, args, env_overrides, expect_success, helper_name=None
+  ):
+    return super(TestCaseTest, self).run_helper(
+        test_id,
+        args + ['HelperTest'],
+        env_overrides,
+        expect_success,
+        helper_name,
+    )
 
   def test_flags_no_env_var_no_flags(self):
     self.run_helper(
@@ -190,11 +209,12 @@ def test_xml_output_file_from_flag(self):
         expect_success=True)
 
   def test_app_run(self):
-    stdout, _ = self.run_helper(
+    stdout, _, _ = self.run_helper(
         7,
         ['--name=cat', '--name=dog'],
         {'ABSLTEST_TEST_HELPER_USE_APP_RUN': '1'},
-        expect_success=True)
+        expect_success=True,
+    )
     self.assertIn('Names in main() are: cat dog', stdout)
     self.assertIn('Names in test_name_flag() are: cat dog', stdout)
 
@@ -226,7 +246,7 @@ def test_expected_failure_if(self):
     self.assertEqual(1, 2)  # the expected failure
 
   def test_expected_failure_success(self):
-    _, stderr = self.run_helper(5, ['--', '-v'], {}, expect_success=False)
+    _, stderr, _ = self.run_helper(5, ['--', '-v'], {}, expect_success=False)
     self.assertRegex(stderr, r'FAILED \(.*unexpected successes=1\)')
 
   def test_assert_equal(self):
@@ -2099,8 +2119,9 @@ def run_tempfile_helper(self, cleanup, expected_paths):
         'ABSLTEST_TEST_HELPER_TEMPFILE_CLEANUP': cleanup,
         'TEST_TMPDIR': tmpdir.full_path,
         }
-    stdout, stderr = self.run_helper(0, ['TempFileHelperTest'], env,
-                                     expect_success=False)
+    stdout, stderr, _ = self.run_helper(
+        0, ['TempFileHelperTest'], env, expect_success=False
+    )
     output = ('\n=== Helper output ===\n'
               '----- stdout -----\n{}\n'
               '----- end stdout -----\n'
@@ -2473,6 +2494,30 @@ def test_foo(self):
     self.assertEmpty(res.errors)
 
 
+class ExitCodeTest(BaseTestCase):
+
+  def test_exits_5_when_no_tests(self):
+    expect_success = sys.version_info < (3, 12)
+    _, _, exit_code = self.run_helper(
+        None,
+        [],
+        {},
+        expect_success=expect_success,
+        helper_name='absltest_test_helper_skipped',
+    )
+    if not expect_success:
+      self.assertEqual(exit_code, 5)
+
+  def test_exits_5_when_all_skipped(self):
+    self.run_helper(
+        None,
+        [],
+        {'ABSLTEST_TEST_HELPER_DEFINE_CLASS': '1'},
+        expect_success=True,
+        helper_name='absltest_test_helper_skipped',
+    )
+
+
 def _listdir_recursive(path):
   for dirname, _, filenames in os.walk(path):
     yield dirname

absl/testing/tests/absltest_test_helper_skipped.py

@@ -0,0 +1,17 @@
+"""Test helper for ExitCodeTest in absltest_test.py."""
+
+import os
+from absl.testing import absltest
+
+
+if os.environ.get("ABSLTEST_TEST_HELPER_DEFINE_CLASS") == "1":
+
+  class MyTest(absltest.TestCase):
+
+    @absltest.skip("Skipped for testing the exit code behavior")
+    def test_foo(self):
+      pass
+
+
+if __name__ == "__main__":
+  absltest.main()