Re-raise unexpected exceptions instead of swallowing them in various tests (pythonGH-152019)

(cherry picked from commit 6c3da17)

Co-authored-by: An Long <aisk@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <stan@python.org>

Author: 2 people

Lib/test/test_fcntl.py

@@ -151,6 +151,7 @@ def test_fcntl_64_bit(self):
             except OSError as exc:
                 if exc.errno == errno.EINVAL:
                     self.skipTest("F_NOTIFY not available by this environment")
+                raise
             fcntl.fcntl(fd, cmd, flags)
         finally:
             os.close(fd)

Lib/test/test_launcher.py

@@ -469,6 +469,7 @@ def test_search_major_2(self):
         except subprocess.CalledProcessError:
             if not is_installed("2.7"):
                 raise unittest.SkipTest("requires at least one Python 2.x install")
+            raise
         self.assertEqual("PythonCore", data["env.company"])
         self.assertStartsWith(data["env.tag"], "2.")
 

Lib/test/test_pathlib/test_pathlib.py

@@ -2870,6 +2870,7 @@ def test_is_socket_true(self):
             if (isinstance(e, PermissionError) or
                     "AF_UNIX path too long" in str(e)):
                 self.skipTest("cannot bind Unix socket: " + str(e))
+            raise
         self.assertTrue(P.is_socket())
         self.assertFalse(P.is_fifo())
         self.assertFalse(P.is_file())

Lib/test/test_socket.py

@@ -1427,6 +1427,7 @@ def testIPv6toString(self):
             except OSError as e:
                 if e.winerror == 10022:
                     self.skipTest('IPv6 might not be supported')
+                raise
 
         f = lambda a: inet_pton(AF_INET6, a)
         assertInvalid = lambda a: self.assertRaises(
@@ -1517,6 +1518,7 @@ def testStringToIPv6(self):
             except OSError as e:
                 if e.winerror == 10022:
                     self.skipTest('IPv6 might not be supported')
+                raise
 
         f = lambda a: inet_ntop(AF_INET6, a)
         assertInvalid = lambda a: self.assertRaises(