diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index f9f864bba..247c9675e 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -7,8 +7,10 @@ from weakref import proxy
 import io
 import _pyio as pyio
 
-from test.support import os_helper, warnings_helper
+from test.support import gc_collect
 from test.support.os_helper import TESTFN
+from test.support import os_helper
+from test.support import warnings_helper
 from collections import UserList
 
 class AutoFileTests:
@@ -29,6 +31,7 @@ class AutoFileTests:
         self.assertEqual(self.f.tell(), p.tell())
         self.f.close()
         self.f = None
+        gc_collect()  # For PyPy or other GCs.
         self.assertRaises(ReferenceError, getattr, p, 'tell')
 
     def testAttributes(self):
@@ -51,7 +54,7 @@ class AutoFileTests:
         # verify readinto refuses text files
         a = array('b', b'x'*10)
         self.f.close()
-        self.f = self.open(TESTFN, 'r')
+        self.f = self.open(TESTFN, encoding="utf-8")
         if hasattr(self.f, "readinto"):
             self.assertRaises(TypeError, self.f.readinto, a)
 
@@ -132,7 +135,6 @@ class AutoFileTests:
 class CAutoFileTests(AutoFileTests, unittest.TestCase):
     open = io.open
 
-@unittest.skipIf(sys.platform == "win32", "TODO: RUSTPYTHON, test setUp errors on Windows")
 class PyAutoFileTests(AutoFileTests, unittest.TestCase):
     open = staticmethod(pyio.open)
 
@@ -154,6 +156,22 @@ class OtherFileTests:
                 f.close()
                 self.fail('%r is an invalid file mode' % mode)
 
+    def testStdin(self):
+        if sys.platform == 'osf1V5':
+            # This causes the interpreter to exit on OSF1 v5.1.
+            self.skipTest(
+                ' sys.stdin.seek(-1) may crash the interpreter on OSF1.'
+                ' Test manually.')
+
+        if not sys.stdin.isatty():
+            # Issue 14853: stdin becomes seekable when redirected to a file
+            self.skipTest('stdin must be a TTY in this test')
+
+        with self.assertRaises((IOError, ValueError)):
+            sys.stdin.seek(-1)
+        with self.assertRaises((IOError, ValueError)):
+            sys.stdin.truncate()
+
     def testBadModeArgument(self):
         # verify that we get a sensible error message for bad mode argument
         bad_mode = "qwerty"
@@ -334,5 +352,6 @@ class COtherFileTests(OtherFileTests, unittest.TestCase):
 class PyOtherFileTests(OtherFileTests, unittest.TestCase):
     open = staticmethod(pyio.open)
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/Lib/test/test_fileio.py b/Lib/test/test_fileio.py
index 59bdd2fe7..8577c48c7 100644
--- a/Lib/test/test_fileio.py
+++ b/Lib/test/test_fileio.py
@@ -9,8 +9,8 @@ from array import array
 from weakref import proxy
 from functools import wraps
 
-from test.support import run_unittest, cpython_only, swap_attr
-from test.support.os_helper import TESTFN, TESTFN_UNICODE, make_bad_fd
+from test.support import cpython_only, swap_attr, gc_collect
+from test.support.os_helper import (TESTFN, TESTFN_UNICODE, make_bad_fd)
 from test.support.warnings_helper import check_warnings
 from collections import UserList
 
@@ -36,6 +36,7 @@ class AutoFileTests:
         self.assertEqual(self.f.tell(), p.tell())
         self.f.close()
         self.f = None
+        gc_collect()  # For PyPy or other GCs.
         self.assertRaises(ReferenceError, getattr, p, 'tell')
 
     def testSeekTell(self):
@@ -177,7 +178,6 @@ class AutoFileTests:
         finally:
             os.close(fd)
 
-    @unittest.skipIf(getattr(sys, '_rustpython_debugbuild', False), "TODO: RUSTPYTHON, stack overflow on debug build")
     def testRecursiveRepr(self):
         # Issue #25455
         with swap_attr(self.f, 'name', self.f):
@@ -664,15 +664,12 @@ class PyOtherFileTests(OtherFileTests, unittest.TestCase):
             self.assertNotEqual(w.warnings, [])
 
 
-def test_main():
+def tearDownModule():
     # Historically, these tests have been sloppy about removing TESTFN.
     # So get rid of it no matter what.
-    try:
-        run_unittest(CAutoFileTests, PyAutoFileTests,
-                     COtherFileTests, PyOtherFileTests)
-    finally:
-        if os.path.exists(TESTFN):
-            os.unlink(TESTFN)
+    if os.path.exists(TESTFN):
+        os.unlink(TESTFN)
+
 
 if __name__ == '__main__':
-    test_main()
+    unittest.main()