bpo-40275: Use new test.support helper submodules in tests

Lib/test/test_argparse.py

@@ -13,6 +13,7 @@
 from io import StringIO
 
 from test import support
+from test.support import os_helper
 from unittest import mock
 class StdIOBuffer(StringIO):
     pass
@@ -23,7 +24,7 @@ def setUp(self):
         # The tests assume that line wrapping occurs at 80 columns, but this
         # behaviour can be overridden by setting the COLUMNS environment
         # variable.  To ensure that this width is used, set COLUMNS to 80.
-        env = support.EnvironmentVarGuard()
+        env = os_helper.EnvironmentVarGuard()
         env['COLUMNS'] = '80'
         self.addCleanup(env.__exit__)
 
@@ -3244,7 +3245,7 @@ class TestShortColumns(HelpTestCase):
     but we don't want any exceptions thrown in such cases. Only ugly representation.
     '''
     def setUp(self):
-        env = support.EnvironmentVarGuard()
+        env = os_helper.EnvironmentVarGuard()
         env.set("COLUMNS", '15')
         self.addCleanup(env.__exit__)
 

Lib/test/test_asyncgen.py

@@ -2,7 +2,7 @@
 import types
 import unittest
 
-from test.support import import_module
+from test.support.import_helper import import_module
 asyncio = import_module("asyncio")
 
 

Lib/test/test_clinic.py

@@ -3,6 +3,7 @@
 # Licensed to the PSF under a contributor agreement.
 
 from test import support, test_tools
+from test.support import os_helper
 from unittest import TestCase
 import collections
 import inspect
@@ -797,7 +798,7 @@ def test_external(self):
         source = support.findfile('clinic.test')
         with open(source, 'r', encoding='utf-8') as f:
             original = f.read()
-        with support.temp_dir() as testdir:
+        with os_helper.temp_dir() as testdir:
             testfile = os.path.join(testdir, 'clinic.test.c')
             with open(testfile, 'w', encoding='utf-8') as f:
                 f.write(original)

Lib/test/test_codecs.py

@@ -8,6 +8,8 @@
 from unittest import mock
 
 from test import support
+from test.support import os_helper
+from test.support import warnings_helper
 
 try:
     import _testcapi
@@ -709,11 +711,11 @@ def test_bug691291(self):
         s1 = 'Hello\r\nworld\r\n'
 
         s = s1.encode(self.encoding)
-        self.addCleanup(support.unlink, support.TESTFN)
-        with open(support.TESTFN, 'wb') as fp:
+        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
+        with open(os_helper.TESTFN, 'wb') as fp:
             fp.write(s)
-        with support.check_warnings(('', DeprecationWarning)):
-            reader = codecs.open(support.TESTFN, 'U', encoding=self.encoding)
+        with warnings_helper.check_warnings(('', DeprecationWarning)):
+            reader = codecs.open(os_helper.TESTFN, 'U', encoding=self.encoding)
         with reader:
             self.assertEqual(reader.read(), s1)
 
@@ -1697,10 +1699,10 @@ def test_all(self):
             getattr(codecs, api)
 
     def test_open(self):
-        self.addCleanup(support.unlink, support.TESTFN)
+        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
         for mode in ('w', 'r', 'r+', 'w+', 'a', 'a+'):
             with self.subTest(mode), \
-                    codecs.open(support.TESTFN, mode, 'ascii') as file:
+                    codecs.open(os_helper.TESTFN, mode, 'ascii') as file:
                 self.assertIsInstance(file, codecs.StreamReaderWriter)
 
     def test_undefined(self):
@@ -1718,7 +1720,7 @@ def test_file_closes_if_lookup_error_raised(self):
         mock_open = mock.mock_open()
         with mock.patch('builtins.open', mock_open) as file:
             with self.assertRaises(LookupError):
-                codecs.open(support.TESTFN, 'wt', 'invalid-encoding')
+                codecs.open(os_helper.TESTFN, 'wt', 'invalid-encoding')
 
             file().close.assert_called()
 
@@ -2516,10 +2518,10 @@ def test_seek0(self):
                  "utf-32",
                  "utf-32-le",
                  "utf-32-be")
-        self.addCleanup(support.unlink, support.TESTFN)
+        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
         for encoding in tests:
             # Check if the BOM is written only once
-            with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f:
+            with codecs.open(os_helper.TESTFN, 'w+', encoding=encoding) as f:
                 f.write(data)
                 f.write(data)
                 f.seek(0)
@@ -2528,7 +2530,7 @@ def test_seek0(self):
                 self.assertEqual(f.read(), data * 2)
 
             # Check that the BOM is written after a seek(0)
-            with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f:
+            with codecs.open(os_helper.TESTFN, 'w+', encoding=encoding) as f:
                 f.write(data[0])
                 self.assertNotEqual(f.tell(), 0)
                 f.seek(0)
@@ -2537,7 +2539,7 @@ def test_seek0(self):
                 self.assertEqual(f.read(), data)
 
             # (StreamWriter) Check that the BOM is written after a seek(0)
-            with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f:
+            with codecs.open(os_helper.TESTFN, 'w+', encoding=encoding) as f:
                 f.writer.write(data[0])
                 self.assertNotEqual(f.writer.tell(), 0)
                 f.writer.seek(0)
@@ -2547,7 +2549,7 @@ def test_seek0(self):
 
             # Check that the BOM is not written after a seek() at a position
             # different than the start
-            with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f:
+            with codecs.open(os_helper.TESTFN, 'w+', encoding=encoding) as f:
                 f.write(data)
                 f.seek(f.tell())
                 f.write(data)
@@ -2556,7 +2558,7 @@ def test_seek0(self):
 
             # (StreamWriter) Check that the BOM is not written after a seek()
             # at a position different than the start
-            with codecs.open(support.TESTFN, 'w+', encoding=encoding) as f:
+            with codecs.open(os_helper.TESTFN, 'w+', encoding=encoding) as f:
                 f.writer.write(data)
                 f.writer.seek(f.writer.tell())
                 f.writer.write(data)

Lib/test/test_doctest.py

@@ -3,6 +3,8 @@
 """
 
 from test import support
+from test.support import import_helper
+from test.support import os_helper
 import doctest
 import functools
 import os
@@ -441,7 +443,7 @@ def basics(): r"""
     >>> tests = finder.find(sample_func)
 
     >>> print(tests)  # doctest: +ELLIPSIS
-    [<DocTest sample_func from ...:25 (1 example)>]
+    [<DocTest sample_func from ...:27 (1 example)>]
 
 The exact name depends on how test_doctest was invoked, so allow for
 leading path components.
@@ -705,7 +707,7 @@ def test_empty_namespace_package(self):
             try:
                 mod = importlib.import_module(pkg_name)
             finally:
-                support.forget(pkg_name)
+                import_helper.forget(pkg_name)
                 sys.path.pop()
 
             include_empty_finder = doctest.DocTestFinder(exclude_empty=False)
@@ -2758,7 +2760,7 @@ def test_lineendings(): r"""
     >>> dn = tempfile.mkdtemp()
     >>> pkg = os.path.join(dn, "doctest_testpkg")
     >>> os.mkdir(pkg)
-    >>> support.create_empty_file(os.path.join(pkg, "__init__.py"))
+    >>> os_helper.create_empty_file(os.path.join(pkg, "__init__.py"))
     >>> fn = os.path.join(pkg, "doctest_testfile.txt")
     >>> with open(fn, 'wb') as f:
     ...     f.write(
@@ -2840,7 +2842,8 @@ def test_CLI(): r"""
 simple tests and no errors.  We'll run both the unadorned doctest command, and
 the verbose version, and then check the output:
 
-    >>> from test.support import script_helper, temp_dir
+    >>> from test.support import script_helper
+    >>> from test.support.os_helper import temp_dir
     >>> with temp_dir() as tmpdir:
     ...     fn = os.path.join(tmpdir, 'myfile.doc')
     ...     with open(fn, 'w') as f:
@@ -2891,7 +2894,8 @@ def test_CLI(): r"""
 file ends in '.py', its handling of python module files (as opposed to straight
 text files).
 
-    >>> from test.support import script_helper, temp_dir
+    >>> from test.support import script_helper
+    >>> from test.support.os_helper import temp_dir
     >>> with temp_dir() as tmpdir:
     ...     fn = os.path.join(tmpdir, 'myfile.doc')
     ...     with open(fn, 'w') as f:
@@ -3109,7 +3113,7 @@ def test_main():
 
 
 def test_coverage(coverdir):
-    trace = support.import_module('trace')
+    trace = import_helper.import_module('trace')
     tracer = trace.Trace(ignoredirs=[sys.base_prefix, sys.base_exec_prefix,],
                          trace=0, count=1)
     tracer.run('test_main()')

Lib/test/test_exceptions.py

@@ -8,10 +8,13 @@
 import weakref
 import errno
 
-from test.support import (TESTFN, captured_stderr, check_impl_detail,
-                          check_warnings, cpython_only, gc_collect,
-                          no_tracing, unlink, import_module, script_helper,
+from test.support import (captured_stderr, check_impl_detail,
+                          cpython_only, gc_collect,
+                          no_tracing, script_helper,
                           SuppressCrashReport)
+from test.support.import_helper import import_module
+from test.support.os_helper import TESTFN, unlink
+from test.support.warnings_helper import check_warnings
 from test import support
 
 

Lib/test/test_ftplib.py

@@ -21,6 +21,7 @@
 from test import support
 from test.support import threading_helper
 from test.support import socket_helper
+from test.support import warnings_helper
 from test.support.socket_helper import HOST, HOSTv6
 
 TIMEOUT = support.LOOPBACK_TIMEOUT
@@ -623,7 +624,7 @@ def test_storlines(self):
 
         f = io.StringIO(RETR_DATA.replace('\r\n', '\n'))
         # storlines() expects a binary file, not a text file
-        with support.check_warnings(('', BytesWarning), quiet=True):
+        with warnings_helper.check_warnings(('', BytesWarning), quiet=True):
             self.assertRaises(TypeError, self.client.storlines, 'stor foo', f)
 
     def test_nlst(self):

Lib/test/test_gc.py

@@ -1,8 +1,9 @@
 import unittest
 import unittest.mock
 from test.support import (verbose, refcount_test, run_unittest,
-                          cpython_only, temp_dir, TESTFN, unlink,
-                          import_module)
+                          cpython_only)
+from test.support.import_helper import import_module
+from test.support.os_helper import temp_dir, TESTFN, unlink
 from test.support.script_helper import assert_python_ok, make_script
 from test.support import threading_helper