Removed unnecessary test cases

Since SinkConfig is a namedtuple now, several of the methods we had been
testing are now inherited from tuple.  There's no need for me to test
those here, so I've removed the unneeded test cases.

test_pdbuddy/__init__.py

         self.assertEqual(str(self.obj_valid_1a),
                 "status: valid\nflags: (none)\nv: 15.00 V\ni: 1.00 A")
 
-    def test_eq_none(self):
-        self.assertTrue(self.obj_none == pdbuddy.SinkConfig(None, None, None,
-            None))
-
-    def test_eq_valid(self):
-        # Set invalid object as valid
-        self.obj_invalid = self.obj_invalid._replace(status=pdbuddy.SinkStatus.VALID)
-
-        self.assertTrue(self.obj_valid == self.obj_invalid)
-
-    def test_eq_wrong_type(self):
-        self.assertFalse(self.obj_none == "hello world")
-
-    def test_eq_wrong_status(self):
-        self.assertFalse(self.obj_valid == self.obj_invalid)
-
-    def test_eq_wrong_flags(self):
-        self.assertFalse(self.obj_valid == self.obj_valid_gb)
-
-    def test_eq_wrong_voltage(self):
-        self.assertFalse(self.obj_valid == self.obj_valid_5v)
-
-    def test_eq_wrong_current(self):
-        self.assertFalse(self.obj_valid == self.obj_valid_1a)
-
-    def test_ne_none(self):
-        self.assertFalse(self.obj_none != pdbuddy.SinkConfig(None, None, None,
-            None))
-
-    def test_ne_valid(self):
-        # Set invalid object as valid
-        self.obj_invalid = self.obj_invalid._replace(status=pdbuddy.SinkStatus.VALID)
-
-        self.assertFalse(self.obj_valid != self.obj_invalid)
-
-    def test_ne_wrong_type(self):
-        self.assertTrue(self.obj_none != "hello world")
-
-    def test_ne_wrong_status(self):
-        self.assertTrue(self.obj_valid != self.obj_invalid)
-
-    def test_hash_identical(self):
-        self.assertEqual(hash(self.obj_none), hash(pdbuddy.SinkConfig(None,
-            None, None, None)))
-
-    def test_hash_different(self):
-        self.assertNotEqual(hash(self.obj_none), hash(self.obj_valid))
-
     def test_from_text_none(self):
         ft_none = pdbuddy.SinkConfig.from_text([])
         self.assertEqual(ft_none, self.obj_none)