Drop test_smtplib tests again

There are already other tests for the functionality, therefore there is
no need to test implementation details.

Author: nmartensen

Lib/test/test_smtplib.py

@@ -282,34 +282,6 @@ def testBasic(self):
         # connect
         smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost',
                             timeout=support.LOOPBACK_TIMEOUT)
-        # implicit .connect must set ._host since it is used by .starttls
-        self.assertEqual(smtp._host, HOST)
-        smtp.quit()
-
-    def test_host_port_host(self):
-        # create instance with host:port notation
-        smtp = smtplib.SMTP(f"{HOST}:{self.port}", local_hostname='localhost',
-                            timeout=support.LOOPBACK_TIMEOUT)
-        # implicit .connect must set ._host since it is used by .starttls
-        self.assertEqual(smtp._host, HOST)
-        smtp.quit()
-
-    def test_explicit_connect(self):
-        # create instance without arguments
-        smtp = smtplib.SMTP(local_hostname='localhost',
-                            timeout=support.LOOPBACK_TIMEOUT)
-        # explicit .connect must set ._host since it is used by .starttls
-        smtp.connect(HOST, self.port)
-        self.assertEqual(smtp._host, HOST)
-        smtp.quit()
-
-    def test_explicit_connect_host_port(self):
-        # create instance without arguments
-        smtp = smtplib.SMTP(local_hostname='localhost',
-                            timeout=support.LOOPBACK_TIMEOUT)
-        # explicit .connect with host:port notation must set ._host, too
-        smtp.connect(f"{HOST}:{self.port}")
-        self.assertEqual(smtp._host, HOST)
         smtp.quit()
 
     def testSourceAddress(self):