gh-116622: Test updates for Android (#117299)

- re-enable test_fcntl_64_bit on Linux aarch64, but disable it on all
  Android ABIs
- use support.setswitchinterval in all relevant tests
- skip test_fma_zero_result on Android x86_64
- accept EACCES when calling os.get_terminal_size on Android

Lib/test/_test_multiprocessing.py

@@ -4662,7 +4662,7 @@ class _TestFinalize(BaseTestCase):
         old_interval = sys.getswitchinterval()
         old_threshold = gc.get_threshold()
         try:
-            sys.setswitchinterval(1e-6)
+            support.setswitchinterval(1e-6)
             gc.set_threshold(5, 5, 5)
             threads = [threading.Thread(target=run_finalizers),
                        threading.Thread(target=make_finalizers)]

Lib/test/test_concurrent_futures/test_wait.py

@@ -142,7 +142,7 @@ class ThreadPoolWaitTests(ThreadPoolMixin, WaitTests, BaseTestCase):
         def future_func():
             event.wait()
         oldswitchinterval = sys.getswitchinterval()
-        sys.setswitchinterval(1e-6)
+        support.setswitchinterval(1e-6)
         try:
             fs = {self.executor.submit(future_func) for i in range(100)}
             event.set()

Lib/test/test_fcntl.py

@@ -131,9 +131,9 @@ class TestFcntl(unittest.TestCase):
             fcntl.fcntl(BadFile(INT_MIN - 1), fcntl.F_SETFL, os.O_NONBLOCK)
 
     @unittest.skipIf(
-        platform.machine().startswith(("arm", "aarch"))
+        (platform.machine().startswith("arm") and platform.system() == "Linux")
-        and platform.system() in ("Linux", "Android"),
+        or platform.system() == "Android",
-        "ARM Linux returns EINVAL for F_NOTIFY DN_MULTISHOT")
+        "this platform returns EINVAL for F_NOTIFY DN_MULTISHOT")
     def test_fcntl_64_bit(self):
         # Issue #1309352: fcntl shouldn't fail when the third arg fits in a
         # C 'long' but not in a C 'int'.

Lib/test/test_gc.py

@@ -1,5 +1,6 @@
 import unittest
 import unittest.mock
+from test import support
 from test.support import (verbose, refcount_test,
                           cpython_only, requires_subprocess,
                           requires_gil_enabled)
@@ -470,7 +471,7 @@ class GCTests(unittest.TestCase):
                 make_nested()
 
         old_switchinterval = sys.getswitchinterval()
-        sys.setswitchinterval(1e-5)
+        support.setswitchinterval(1e-5)
         try:
             exit = []
             threads = []

Lib/test/test_importlib/test_threaded_import.py

@@ -13,6 +13,7 @@ import time
 import shutil
 import threading
 import unittest
+from test import support
 from test.support import verbose
 from test.support.import_helper import forget, mock_register_at_fork
 from test.support.os_helper import (TESTFN, unlink, rmtree)
@@ -260,7 +261,7 @@ def setUpModule():
     try:
         old_switchinterval = sys.getswitchinterval()
         unittest.addModuleCleanup(sys.setswitchinterval, old_switchinterval)
-        sys.setswitchinterval(1e-5)
+        support.setswitchinterval(1e-5)
     except AttributeError:
         pass
 

Lib/test/test_math.py

@@ -2691,12 +2691,12 @@ class FMATests(unittest.TestCase):
             self.assertEqual(math.fma(-b, -math.inf, c), math.inf)
             self.assertEqual(math.fma(-b, math.inf, c), -math.inf)
 
-    # gh-73468: On WASI and FreeBSD, libc fma() doesn't implement IEE 754-2008
+    # gh-73468: On some platforms, libc fma() doesn't implement IEE 754-2008
     # properly: it doesn't use the right sign when the result is zero.
-    @unittest.skipIf(support.is_wasi,
+    @unittest.skipIf(
-                     "WASI fma() doesn't implement IEE 754-2008 properly")
+        sys.platform.startswith(("freebsd", "wasi"))
-    @unittest.skipIf(sys.platform.startswith('freebsd'),
+        or (sys.platform == "android" and platform.machine() == "x86_64"),
-                     "FreeBSD fma() doesn't implement IEE 754-2008 properly")
+        f"this platform doesn't implement IEE 754-2008 properly")
     def test_fma_zero_result(self):
         nonnegative_finites = [0.0, 1e-300, 2.3, 1e300]
 

Lib/test/test_os.py

@@ -3934,7 +3934,12 @@ class TermsizeTests(unittest.TestCase):
         try:
             size = os.get_terminal_size()
         except OSError as e:
-            if sys.platform == "win32" or e.errno in (errno.EINVAL, errno.ENOTTY):
+            known_errnos = [errno.EINVAL, errno.ENOTTY]
+            if sys.platform == "android":
+                # The Android testbed redirects the native stdout to a pipe,
+                # which returns a different error code.
+                known_errnos.append(errno.EACCES)
+            if sys.platform == "win32" or e.errno in known_errnos:
                 # Under win32 a generic OSError can be thrown if the
                 # handle cannot be retrieved
                 self.skipTest("failed to query terminal size")

Lib/test/test_threading.py

@@ -515,7 +515,7 @@ class ThreadTests(BaseTestCase):
         old_interval = sys.getswitchinterval()
         try:
             for i in range(1, 100):
-                sys.setswitchinterval(i * 0.0002)
+                support.setswitchinterval(i * 0.0002)
                 t = threading.Thread(target=lambda: None)
                 t.start()
                 t.join()