gh-109162: Refactor libregrtest.runtest (#109172)

* Rename runtest() to run_single_test().
* Pass runtests to run_single_test().
* Add type annotation to Regrtest attributes. Add missing attributes
  to Namespace.
* Add attributes to Regrtest and RunTests:

  * fail_fast
  * ignore_tests
  * match_tests
  * output_on_failure
  * pgo
  * pgo_extended
  * timeout

* Get pgo from 'runtests', rather than from 'ns'.
* Remove WorkerJob.match_tests.
* setup_support() now gets pgo_extended from runtests.
* save_env(): change parameter order, pass test_name first.
* Add setup_test_dir() function.
* Pass runtests to setup_tests().

5 files changed, 134 insertions, 104 deletions

diff --git a/Lib/test/libregrtest/cmdline.py b/Lib/test/libregrtest/cmdline.py
index c08b3be..71e7396 100644
--- a/Lib/test/libregrtest/cmdline.py
+++ b/Lib/test/libregrtest/cmdline.py
@@ -149,6 +149,10 @@ class Namespace(argparse.Namespace):
         self.verbose = 0
         self.quiet = False
         self.exclude = False
+        self.cleanup = False
+        self.wait = False
+        self.list_cases = False
+        self.list_tests = False
         self.single = False
         self.randomize = False
         self.fromfile = None
@@ -171,6 +175,8 @@ class Namespace(argparse.Namespace):
         self.pgo = False
         self.pgo_extended = False
         self.worker_json = None
+        self.start = None
+        self.timeout = None
 
         super().__init__(**kwargs)
 
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index cd053c5..f7d28a8 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -11,10 +11,10 @@ import time
 import unittest
 from test.libregrtest.cmdline import _parse_args, Namespace
 from test.libregrtest.runtest import (
-    findtests, split_test_packages, runtest, abs_module_name,
+    findtests, split_test_packages, run_single_test, abs_module_name,
     PROGRESS_MIN_TIME, State, RunTests, TestResult,
     FilterTuple, FilterDict, TestList)
-from test.libregrtest.setup import setup_tests
+from test.libregrtest.setup import setup_tests, setup_test_dir
 from test.libregrtest.pgo import setup_pgo_tests
 from test.libregrtest.utils import (strip_py_suffix, count, format_duration,
                                     printlist, get_build_info)
@@ -64,11 +64,11 @@ class Regrtest:
         self.ns: Namespace = ns
 
         # Actions
-        self.want_header = ns.header
-        self.want_list_tests = ns.list_tests
-        self.want_list_cases = ns.list_cases
-        self.want_wait = ns.wait
-        self.want_cleanup = ns.cleanup
+        self.want_header: bool = ns.header
+        self.want_list_tests: bool = ns.list_tests
+        self.want_list_cases: bool = ns.list_cases
+        self.want_wait: bool = ns.wait
+        self.want_cleanup: bool = ns.cleanup
 
         # Select tests
         if ns.match_tests:
@@ -79,14 +79,19 @@ class Regrtest:
             self.ignore_tests: FilterTuple = tuple(ns.ignore_tests)
         else:
             self.ignore_tests = None
-        self.exclude = ns.exclude
-        self.fromfile = ns.fromfile
-        self.starting_test = ns.start
+        self.exclude: bool = ns.exclude
+        self.fromfile: str | None = ns.fromfile
+        self.starting_test: str | None = ns.start
 
         # Options to run tests
-        self.forever = ns.forever
-        self.randomize = ns.randomize
-        self.random_seed = ns.random_seed
+        self.fail_fast: bool = ns.failfast
+        self.forever: bool = ns.forever
+        self.randomize: bool = ns.randomize
+        self.random_seed: int | None = ns.random_seed
+        self.pgo: bool = ns.pgo
+        self.pgo_extended: bool = ns.pgo_extended
+        self.output_on_failure: bool = ns.verbose3
+        self.timeout: float | None = ns.timeout
 
         # tests
         self.tests = []
@@ -196,21 +201,19 @@ class Regrtest:
 
     def display_progress(self, test_index, text):
         quiet = self.ns.quiet
-        pgo = self.ns.pgo
         if quiet:
             return
 
         # "[ 51/405/1] test_tcl passed"
         line = f"{test_index:{self.test_count_width}}{self.test_count_text}"
         fails = len(self.bad) + len(self.environment_changed)
-        if fails and not pgo:
+        if fails and not self.pgo:
             line = f"{line}/{fails}"
         self.log(f"[{line}] {text}")
 
     def find_tests(self):
         ns = self.ns
         single = ns.single
-        pgo = ns.pgo
         test_dir = ns.testdir
 
         if single:
@@ -237,7 +240,7 @@ class Regrtest:
 
         strip_py_suffix(self.tests)
 
-        if pgo:
+        if self.pgo:
             # add default PGO tests if no tests are specified
             setup_pgo_tests(ns)
 
@@ -329,8 +332,6 @@ class Regrtest:
         # Configure the runner to re-run tests
         ns = self.ns
         ns.verbose = True
-        ns.failfast = False
-        ns.verbose3 = False
         if ns.use_mp is None:
             ns.use_mp = 1
 
@@ -345,12 +346,16 @@ class Regrtest:
 
         # Re-run failed tests
         self.log(f"Re-running {len(tests)} failed tests in verbose mode in subprocesses")
-        runtests = runtests.copy(tests=tuple(tests),
-                                 match_tests_dict=match_tests_dict,
-                                 rerun=True,
-                                 forever=False)
+        runtests = runtests.copy(
+            tests=tuple(tests),
+            rerun=True,
+            forever=False,
+            fail_fast=False,
+            match_tests_dict=match_tests_dict,
+            output_on_failure=False)
         self.set_tests(runtests)
         self._run_tests_mp(runtests)
+        return runtests
 
     def rerun_failed_tests(self, need_rerun, runtests: RunTests):
         if self.ns.python:
@@ -364,16 +369,16 @@ class Regrtest:
         self.first_state = self.get_tests_state()
 
         print()
-        self._rerun_failed_tests(need_rerun, runtests)
+        rerun_runtests = self._rerun_failed_tests(need_rerun, runtests)
 
         if self.bad:
             print(count(len(self.bad), 'test'), "failed again:")
             printlist(self.bad)
 
-        self.display_result()
+        self.display_result(rerun_runtests)
 
-    def display_result(self):
-        pgo = self.ns.pgo
+    def display_result(self, runtests):
+        pgo = runtests.pgo
         quiet = self.ns.quiet
         print_slow = self.ns.print_slow
 
@@ -444,12 +449,12 @@ class Regrtest:
         if tracer is not None:
             # If we're tracing code coverage, then we don't exit with status
             # if on a false return value from main.
-            cmd = ('result = runtest(self.ns, test_name)')
+            cmd = ('result = run_single_test(test_name, runtests, self.ns)')
             ns = dict(locals())
             tracer.runctx(cmd, globals=globals(), locals=ns)
             result = ns['result']
         else:
-            result = runtest(self.ns, test_name)
+            result = run_single_test(test_name, runtests, self.ns)
 
         self.accumulate_result(result)
 
@@ -458,9 +463,7 @@ class Regrtest:
     def run_tests_sequentially(self, runtests):
         ns = self.ns
         coverage = ns.trace
-        fail_fast = ns.failfast
         fail_env_changed = ns.fail_env_changed
-        timeout = ns.timeout
 
         if coverage:
             import trace
@@ -471,8 +474,8 @@ class Regrtest:
         save_modules = sys.modules.keys()
 
         msg = "Run tests sequentially"
-        if timeout:
-            msg += " (timeout: %s)" % format_duration(timeout)
+        if runtests.timeout:
+            msg += " (timeout: %s)" % format_duration(runtests.timeout)
         self.log(msg)
 
         previous_test = None
@@ -492,7 +495,7 @@ class Regrtest:
                 if module not in save_modules and module.startswith("test."):
                     support.unload(module)
 
-            if result.must_stop(fail_fast, fail_env_changed):
+            if result.must_stop(self.fail_fast, fail_env_changed):
                 break
 
             previous_test = str(result)
@@ -850,16 +853,28 @@ class Regrtest:
 
         # For a partial run, we do not need to clutter the output.
         if (self.want_header
-            or not(self.ns.pgo or self.ns.quiet or self.ns.single
+            or not(self.pgo or self.ns.quiet or self.ns.single
                    or self.tests or self.ns.args)):
             self.display_header()
 
         if self.randomize:
             print("Using random seed", self.random_seed)
 
-        runtests = RunTests(tuple(self.selected), forever=self.forever)
+        runtests = RunTests(
+            tuple(self.selected),
+            fail_fast=self.fail_fast,
+            match_tests=self.match_tests,
+            ignore_tests=self.ignore_tests,
+            forever=self.forever,
+            pgo=self.pgo,
+            pgo_extended=self.pgo_extended,
+            output_on_failure=self.output_on_failure,
+            timeout=self.timeout)
+
+        setup_tests(runtests, self.ns)
+
         tracer = self.run_tests(runtests)
-        self.display_result()
+        self.display_result(runtests)
 
         need_rerun = self.need_rerun
         if self.ns.rerun and need_rerun:
@@ -877,7 +892,7 @@ class Regrtest:
         if self.want_wait:
             input("Press any key to continue...")
 
-        setup_tests(self.ns)
+        setup_test_dir(self.ns.testdir)
         self.find_tests()
 
         exitcode = 0
diff --git a/Lib/test/libregrtest/runtest.py b/Lib/test/libregrtest/runtest.py
index ea5d056..bfb0718 100644
--- a/Lib/test/libregrtest/runtest.py
+++ b/Lib/test/libregrtest/runtest.py
@@ -208,9 +208,16 @@ class TestResult:
 @dataclasses.dataclass(slots=True, frozen=True)
 class RunTests:
     tests: TestTuple
+    fail_fast: bool = False
+    match_tests: FilterTuple | None = None
+    ignore_tests: FilterTuple | None = None
     match_tests_dict: FilterDict | None = None
     rerun: bool = False
     forever: bool = False
+    pgo: bool = False
+    pgo_extended: bool = False
+    output_on_failure: bool = False
+    timeout: float | None = None
 
     def copy(self, **override):
         state = dataclasses.asdict(self)
@@ -295,11 +302,11 @@ def abs_module_name(test_name: str, test_dir: str | None) -> str:
         return 'test.' + test_name
 
 
-def setup_support(ns: Namespace):
-    support.PGO = ns.pgo
-    support.PGO_EXTENDED = ns.pgo_extended
-    support.set_match_tests(ns.match_tests, ns.ignore_tests)
-    support.failfast = ns.failfast
+def setup_support(runtests: RunTests, ns: Namespace):
+    support.PGO = runtests.pgo
+    support.PGO_EXTENDED = runtests.pgo_extended
+    support.set_match_tests(runtests.match_tests, runtests.ignore_tests)
+    support.failfast = runtests.fail_fast
     support.verbose = ns.verbose
     if ns.xmlpath:
         support.junit_xml_list = []
@@ -307,12 +314,12 @@ def setup_support(ns: Namespace):
         support.junit_xml_list = None
 
 
-def _runtest(result: TestResult, ns: Namespace) -> None:
+def _runtest(result: TestResult, runtests: RunTests, ns: Namespace) -> None:
     # Capture stdout and stderr, set faulthandler timeout,
     # and create JUnit XML report.
     verbose = ns.verbose
-    output_on_failure = ns.verbose3
-    timeout = ns.timeout
+    output_on_failure = runtests.output_on_failure
+    timeout = runtests.timeout
 
     use_timeout = (
         timeout is not None and threading_helper.can_start_thread
@@ -321,7 +328,7 @@ def _runtest(result: TestResult, ns: Namespace) -> None:
         faulthandler.dump_traceback_later(timeout, exit=True)
 
     try:
-        setup_support(ns)
+        setup_support(runtests, ns)
 
         if output_on_failure:
             support.verbose = True
@@ -341,7 +348,7 @@ def _runtest(result: TestResult, ns: Namespace) -> None:
                 # warnings will be written to sys.stderr below.
                 print_warning.orig_stderr = stream
 
-                _runtest_env_changed_exc(result, ns, display_failure=False)
+                _runtest_env_changed_exc(result, runtests, ns, display_failure=False)
                 # Ignore output if the test passed successfully
                 if result.state != State.PASSED:
                     output = stream.getvalue()
@@ -356,7 +363,7 @@ def _runtest(result: TestResult, ns: Namespace) -> None:
         else:
             # Tell tests to be moderately quiet
             support.verbose = verbose
-            _runtest_env_changed_exc(result, ns, display_failure=not verbose)
+            _runtest_env_changed_exc(result, runtests, ns, display_failure=not verbose)
 
         xml_list = support.junit_xml_list
         if xml_list:
@@ -369,7 +376,7 @@ def _runtest(result: TestResult, ns: Namespace) -> None:
         support.junit_xml_list = None
 
 
-def runtest(ns: Namespace, test_name: str) -> TestResult:
+def run_single_test(test_name: str, runtests: RunTests, ns: Namespace) -> TestResult:
     """Run a single test.
 
     ns -- regrtest namespace of options
@@ -382,10 +389,11 @@ def runtest(ns: Namespace, test_name: str) -> TestResult:
     """
     start_time = time.perf_counter()
     result = TestResult(test_name)
+    pgo = runtests.pgo
     try:
-        _runtest(result, ns)
+        _runtest(result, runtests, ns)
     except:
-        if not ns.pgo:
+        if not pgo:
             msg = traceback.format_exc()
             print(f"test {test_name} crashed -- {msg}",
                   file=sys.stderr, flush=True)
@@ -404,8 +412,8 @@ def run_unittest(test_mod):
     return support.run_unittest(tests)
 
 
-def save_env(ns: Namespace, test_name: str):
-    return saved_test_environment(test_name, ns.verbose, ns.quiet, pgo=ns.pgo)
+def save_env(test_name: str, runtests: RunTests, ns: Namespace):
+    return saved_test_environment(test_name, ns.verbose, ns.quiet, pgo=runtests.pgo)
 
 
 def regrtest_runner(result, test_func, ns) -> None:
@@ -442,7 +450,7 @@ def regrtest_runner(result, test_func, ns) -> None:
 FOUND_GARBAGE = []
 
 
-def _load_run_test(result: TestResult, ns: Namespace) -> None:
+def _load_run_test(result: TestResult, runtests: RunTests, ns: Namespace) -> None:
     # Load the test function, run the test function.
     module_name = abs_module_name(result.test_name, ns.testdir)
 
@@ -458,7 +466,7 @@ def _load_run_test(result: TestResult, ns: Namespace) -> None:
         return run_unittest(test_mod)
 
     try:
-        with save_env(ns, result.test_name):
+        with save_env(result.test_name, runtests, ns):
             regrtest_runner(result, test_func, ns)
     finally:
         # First kill any dangling references to open files etc.
@@ -482,7 +490,8 @@ def _load_run_test(result: TestResult, ns: Namespace) -> None:
     support.reap_children()
 
 
-def _runtest_env_changed_exc(result: TestResult, ns: Namespace,
+def _runtest_env_changed_exc(result: TestResult, runtests: RunTests,
+                             ns: Namespace,
                              display_failure: bool = True) -> None:
     # Detect environment changes, handle exceptions.
 
@@ -490,7 +499,8 @@ def _runtest_env_changed_exc(result: TestResult, ns: Namespace,
     # the environment
     support.environment_altered = False
 
-    if ns.pgo:
+    pgo = runtests.pgo
+    if pgo:
         display_failure = False
 
     test_name = result.test_name
@@ -498,15 +508,15 @@ def _runtest_env_changed_exc(result: TestResult, ns: Namespace,
         clear_caches()
         support.gc_collect()
 
-        with save_env(ns, test_name):
-            _load_run_test(result, ns)
+        with save_env(test_name, runtests, ns):
+            _load_run_test(result, runtests, ns)
     except support.ResourceDenied as msg:
-        if not ns.quiet and not ns.pgo:
+        if not ns.quiet and not pgo:
             print(f"{test_name} skipped -- {msg}", flush=True)
         result.state = State.RESOURCE_DENIED
         return
     except unittest.SkipTest as msg:
-        if not ns.quiet and not ns.pgo:
+        if not ns.quiet and not pgo:
             print(f"{test_name} skipped -- {msg}", flush=True)
         result.state = State.SKIPPED
         return
@@ -536,7 +546,7 @@ def _runtest_env_changed_exc(result: TestResult, ns: Namespace,
         result.state = State.INTERRUPTED
         return
     except:
-        if not ns.pgo:
+        if not pgo:
             msg = traceback.format_exc()
             print(f"test {test_name} crashed -- {msg}",
                   file=sys.stderr, flush=True)
diff --git a/Lib/test/libregrtest/runtest_mp.py b/Lib/test/libregrtest/runtest_mp.py
index 45db24f..ecdde3a 100644
--- a/Lib/test/libregrtest/runtest_mp.py
+++ b/Lib/test/libregrtest/runtest_mp.py
@@ -10,7 +10,7 @@ import tempfile
 import threading
 import time
 import traceback
-from typing import NamedTuple, NoReturn, Literal, Any, TextIO
+from typing import NoReturn, Literal, Any, TextIO
 
 from test import support
 from test.support import os_helper
@@ -19,9 +19,9 @@ from test.support import TestStats
 from test.libregrtest.cmdline import Namespace
 from test.libregrtest.main import Regrtest
 from test.libregrtest.runtest import (
-    runtest, TestResult, State, PROGRESS_MIN_TIME,
+    run_single_test, TestResult, State, PROGRESS_MIN_TIME,
     FilterTuple, RunTests)
-from test.libregrtest.setup import setup_tests
+from test.libregrtest.setup import setup_tests, setup_test_dir
 from test.libregrtest.utils import format_duration, print_warning
 
 if sys.platform == 'win32':
@@ -48,7 +48,6 @@ USE_PROCESS_GROUP = (hasattr(os, "setsid") and hasattr(os, "killpg"))
 class WorkerJob:
     runtests: RunTests
     namespace: Namespace
-    match_tests: FilterTuple | None = None
 
 
 class _EncodeWorkerJob(json.JSONEncoder):
@@ -126,9 +125,10 @@ def worker_process(worker_json: str) -> NoReturn:
     runtests = worker_job.runtests
     ns = worker_job.namespace
     test_name = runtests.tests[0]
-    match_tests: FilterTuple | None = worker_job.match_tests
+    match_tests: FilterTuple | None = runtests.match_tests
 
-    setup_tests(ns)
+    setup_test_dir(ns.testdir)
+    setup_tests(runtests, ns)
 
     if runtests.rerun:
         if match_tests:
@@ -138,10 +138,7 @@ def worker_process(worker_json: str) -> NoReturn:
             print(f"Re-running {test_name} in verbose mode", flush=True)
         ns.verbose = True
 
-        if match_tests is not None:
-            ns.match_tests = match_tests
-
-    result = runtest(ns, test_name)
+    result = run_single_test(test_name, runtests, ns)
     print()   # Force a newline (just in case)
 
     # Serialize TestResult as dict in JSON
@@ -330,11 +327,13 @@ class TestWorkerProcess(threading.Thread):
             match_tests = self.runtests.get_match_tests(test_name)
         else:
             match_tests = None
-        worker_runtests = self.runtests.copy(tests=tests)
+        kwargs = {}
+        if match_tests:
+            kwargs['match_tests'] = match_tests
+        worker_runtests = self.runtests.copy(tests=tests, **kwargs)
         worker_job = WorkerJob(
             worker_runtests,
-            namespace=self.ns,
-            match_tests=match_tests)
+            namespace=self.ns)
 
         # gh-94026: Write stdout+stderr to a tempfile as workaround for
         # non-blocking pipes on Emscripten with NodeJS.
@@ -401,7 +400,7 @@ class TestWorkerProcess(threading.Thread):
         return MultiprocessResult(result, stdout)
 
     def run(self) -> None:
-        fail_fast = self.ns.failfast
+        fail_fast = self.runtests.fail_fast
         fail_env_changed = self.ns.fail_env_changed
         while not self._stopped:
             try:
@@ -473,7 +472,6 @@ def get_running(workers: list[TestWorkerProcess]) -> list[TestWorkerProcess]:
 class MultiprocessTestRunner:
     def __init__(self, regrtest: Regrtest, runtests: RunTests) -> None:
         ns = regrtest.ns
-        timeout = ns.timeout
 
         self.regrtest = regrtest
         self.runtests = runtests
@@ -483,24 +481,24 @@ class MultiprocessTestRunner:
         self.output: queue.Queue[QueueOutput] = queue.Queue()
         tests_iter = runtests.iter_tests()
         self.pending = MultiprocessIterator(tests_iter)
-        if timeout is not None:
+        self.timeout = runtests.timeout
+        if self.timeout is not None:
             # Rely on faulthandler to kill a worker process. This timouet is
             # when faulthandler fails to kill a worker process. Give a maximum
             # of 5 minutes to faulthandler to kill the worker.
-            self.worker_timeout = min(timeout * 1.5, timeout + 5 * 60)
+            self.worker_timeout = min(self.timeout * 1.5, self.timeout + 5 * 60)
         else:
             self.worker_timeout = None
         self.workers = None
 
     def start_workers(self) -> None:
         use_mp = self.ns.use_mp
-        timeout = self.ns.timeout
         self.workers = [TestWorkerProcess(index, self)
                         for index in range(1, use_mp + 1)]
         msg = f"Run tests in parallel using {len(self.workers)} child processes"
-        if timeout:
+        if self.timeout:
             msg += (" (timeout: %s, worker timeout: %s)"
-                    % (format_duration(timeout),
+                    % (format_duration(self.timeout),
                        format_duration(self.worker_timeout)))
         self.log(msg)
         for worker in self.workers:
@@ -514,9 +512,8 @@ class MultiprocessTestRunner:
             worker.wait_stopped(start_time)
 
     def _get_result(self) -> QueueOutput | None:
-        pgo = self.ns.pgo
-        use_faulthandler = (self.ns.timeout is not None)
-        timeout = PROGRESS_UPDATE
+        pgo = self.runtests.pgo
+        use_faulthandler = (self.timeout is not None)
 
         # bpo-46205: check the status of workers every iteration to avoid
         # waiting forever on an empty queue.
@@ -527,7 +524,7 @@ class MultiprocessTestRunner:
 
             # wait for a thread
             try:
-                return self.output.get(timeout=timeout)
+                return self.output.get(timeout=PROGRESS_UPDATE)
             except queue.Empty:
                 pass
 
@@ -544,7 +541,7 @@ class MultiprocessTestRunner:
 
     def display_result(self, mp_result: MultiprocessResult) -> None:
         result = mp_result.result
-        pgo = self.ns.pgo
+        pgo = self.runtests.pgo
 
         text = str(result)
         if mp_result.err_msg:
@@ -580,9 +577,8 @@ class MultiprocessTestRunner:
         return result
 
     def run_tests(self) -> None:
-        fail_fast = self.ns.failfast
+        fail_fast = self.runtests.fail_fast
         fail_env_changed = self.ns.fail_env_changed
-        timeout = self.ns.timeout
 
         self.start_workers()
 
@@ -600,7 +596,7 @@ class MultiprocessTestRunner:
             print()
             self.regrtest.interrupted = True
         finally:
-            if timeout is not None:
+            if self.timeout is not None:
                 faulthandler.cancel_dump_traceback_later()
 
             # Always ensure that all worker processes are no longer
diff --git a/Lib/test/libregrtest/setup.py b/Lib/test/libregrtest/setup.py
index b76bece..f640362 100644
--- a/Lib/test/libregrtest/setup.py
+++ b/Lib/test/libregrtest/setup.py
@@ -18,7 +18,14 @@ from test.libregrtest.utils import (setup_unraisable_hook,
 UNICODE_GUARD_ENV = "PYTHONREGRTEST_UNICODE_GUARD"
 
 
-def setup_tests(ns):
+def setup_test_dir(testdir):
+    if testdir:
+        # Prepend test directory to sys.path, so runtest() will be able
+        # to locate tests
+        sys.path.insert(0, os.path.abspath(testdir))
+
+
+def setup_tests(runtests, ns):
     try:
         stderr_fd = sys.__stderr__.fileno()
     except (ValueError, AttributeError):
@@ -44,11 +51,6 @@ def setup_tests(ns):
     replace_stdout()
     support.record_original_stdout(sys.stdout)
 
-    if ns.testdir:
-        # Prepend test directory to sys.path, so runtest() will be able
-        # to locate tests
-        sys.path.insert(0, os.path.abspath(ns.testdir))
-
     # Some times __path__ and __file__ are not absolute (e.g. while running from
     # Lib/) and, if we change the CWD to run the tests in a temporary dir, some
     # imports might fail.  This affects only the modules imported before os.chdir().
@@ -88,16 +90,17 @@ def setup_tests(ns):
     setup_unraisable_hook()
     setup_threading_excepthook()
 
-    if ns.timeout is not None:
+    timeout = runtests.timeout
+    if timeout is not None:
         # For a slow buildbot worker, increase SHORT_TIMEOUT and LONG_TIMEOUT
-        support.SHORT_TIMEOUT = max(support.SHORT_TIMEOUT, ns.timeout / 40)
-        support.LONG_TIMEOUT = max(support.LONG_TIMEOUT, ns.timeout / 4)
+        support.SHORT_TIMEOUT = max(support.SHORT_TIMEOUT, timeout / 40)
+        support.LONG_TIMEOUT = max(support.LONG_TIMEOUT, timeout / 4)
 
         # If --timeout is short: reduce timeouts
-        support.LOOPBACK_TIMEOUT = min(support.LOOPBACK_TIMEOUT, ns.timeout)
-        support.INTERNET_TIMEOUT = min(support.INTERNET_TIMEOUT, ns.timeout)
-        support.SHORT_TIMEOUT = min(support.SHORT_TIMEOUT, ns.timeout)
-        support.LONG_TIMEOUT = min(support.LONG_TIMEOUT, ns.timeout)
+        support.LOOPBACK_TIMEOUT = min(support.LOOPBACK_TIMEOUT, timeout)
+        support.INTERNET_TIMEOUT = min(support.INTERNET_TIMEOUT, timeout)
+        support.SHORT_TIMEOUT = min(support.SHORT_TIMEOUT, timeout)
+        support.LONG_TIMEOUT = min(support.LONG_TIMEOUT, timeout)
 
     if ns.xmlpath:
         from test.support.testresult import RegressionTestResult