Bug report

Bug description:

Six tests in test_unittest.test_program fail when the test suite is run with -X lazy_imports=all:

./python -X lazy_imports=all -m test test_unittest

ERROR: test_Exit (test.test_unittest.test_program.Test_TestProgram.test_Exit)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Lib/test/test_unittest/test_program.py", line 150, in test_Exit
    unittest.main(
    ~~~~~~~~~~~~~^
        argv=["foobar"],
        ...
TypeError: 'module' object is not callable

The same error occurs in test_ExitAsDefault, test_ExitEmptySuite, test_ExitSetUpClassFailureSuite, test_ExitSkippedSuite and test_NonExit.

unittest.main resolves to the unittest.main submodule instead of the unittest.main.TestProgram class.

Without -X lazy_imports=all the tests pass.

Build configuration:

CC=clang-21 CXX=clang++-21 LDFLAGS='-fuse-ld=lld-21' ./configure --enable-experimental-jit=yes

CPython versions tested on:

CPython main branch, 3.16

Operating systems tested on:

Linux

Linked PRs

• gh-158086: Fix unittest.main shadowed by its submodule under lazy imports #158087