bpo-36234: Add more tests to PosixUidGidTests (GH-12234)

test_posix.PosixUidGidTests:

* Add tests for invalid uid/gid type (str)
* Add UID_OVERFLOW and GID_OVERFLOW constants to replace (1 << 32)

Initial patch written by David Malcolm.
Co-Authored-By: David Malcolm <dmalcolm@redhat.com>

Lib/test/test_os.py

@@ -1796,36 +1796,46 @@ class LinkTests(unittest.TestCase):
 
 @unittest.skipIf(sys.platform == "win32", "Posix specific tests")
 class PosixUidGidTests(unittest.TestCase):
+    # uid_t and gid_t are 32-bit unsigned integers on Linux
+    UID_OVERFLOW = (1 << 32)
+    GID_OVERFLOW = (1 << 32)
+
     @unittest.skipUnless(hasattr(os, 'setuid'), 'test needs os.setuid()')
     def test_setuid(self):
         if os.getuid() != 0:
             self.assertRaises(OSError, os.setuid, 0)
-        self.assertRaises(OverflowError, os.setuid, 1<<32)
+        self.assertRaises(TypeError, os.setuid, 'not an int')
+        self.assertRaises(OverflowError, os.setuid, self.UID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'setgid'), 'test needs os.setgid()')
     def test_setgid(self):
         if os.getuid() != 0 and not HAVE_WHEEL_GROUP:
             self.assertRaises(OSError, os.setgid, 0)
-        self.assertRaises(OverflowError, os.setgid, 1<<32)
+        self.assertRaises(TypeError, os.setgid, 'not an int')
+        self.assertRaises(OverflowError, os.setgid, self.GID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'seteuid'), 'test needs os.seteuid()')
     def test_seteuid(self):
         if os.getuid() != 0:
             self.assertRaises(OSError, os.seteuid, 0)
-        self.assertRaises(OverflowError, os.seteuid, 1<<32)
+        self.assertRaises(TypeError, os.setegid, 'not an int')
+        self.assertRaises(OverflowError, os.seteuid, self.UID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'setegid'), 'test needs os.setegid()')
     def test_setegid(self):
         if os.getuid() != 0 and not HAVE_WHEEL_GROUP:
             self.assertRaises(OSError, os.setegid, 0)
-        self.assertRaises(OverflowError, os.setegid, 1<<32)
+        self.assertRaises(TypeError, os.setegid, 'not an int')
+        self.assertRaises(OverflowError, os.setegid, self.GID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'setreuid'), 'test needs os.setreuid()')
     def test_setreuid(self):
         if os.getuid() != 0:
             self.assertRaises(OSError, os.setreuid, 0, 0)
-        self.assertRaises(OverflowError, os.setreuid, 1<<32, 0)
-        self.assertRaises(OverflowError, os.setreuid, 0, 1<<32)
+        self.assertRaises(TypeError, os.setreuid, 'not an int', 0)
+        self.assertRaises(TypeError, os.setreuid, 0, 'not an int')
+        self.assertRaises(OverflowError, os.setreuid, self.UID_OVERFLOW, 0)
+        self.assertRaises(OverflowError, os.setreuid, 0, self.UID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'setreuid'), 'test needs os.setreuid()')
     def test_setreuid_neg1(self):
@@ -1839,8 +1849,10 @@ class PosixUidGidTests(unittest.TestCase):
     def test_setregid(self):
         if os.getuid() != 0 and not HAVE_WHEEL_GROUP:
             self.assertRaises(OSError, os.setregid, 0, 0)
-        self.assertRaises(OverflowError, os.setregid, 1<<32, 0)
-        self.assertRaises(OverflowError, os.setregid, 0, 1<<32)
+        self.assertRaises(TypeError, os.setregid, 'not an int', 0)
+        self.assertRaises(TypeError, os.setregid, 0, 'not an int')
+        self.assertRaises(OverflowError, os.setregid, self.GID_OVERFLOW, 0)
+        self.assertRaises(OverflowError, os.setregid, 0, self.GID_OVERFLOW)
 
     @unittest.skipUnless(hasattr(os, 'setregid'), 'test needs os.setregid()')
     def test_setregid_neg1(self):

Misc/NEWS.d/next/Tests/2019-03-08-12-53-37.bpo-36234.NRVK6W.rst

+test_posix.PosixUidGidTests: add tests for invalid uid/gid type (str).
+Initial patch written by David Malcolm.