Remove message_test_wrapper for python's message_test.

The test wrappers were another way to document nonconformant behaviour between
different python backends. We can achieve the same by removing the wrapper
script and adding an if-condition in the test itself based on
api_implementation.Type(). Since we already do that for nonconformance between
pure Python vs. C++ backends, this change makes it easier to look for UPB
nonconformance instead of going through another layer of indirection.

PiperOrigin-RevId: 699321395

python/google/protobuf/internal/message_test.py

@@ -353,7 +353,12 @@ def testExtremeDoubleValues(self, message_module):
   def testFloatPrinting(self, message_module):
     message = message_module.TestAllTypes()
     message.optional_float = 2.0
-    self.assertEqual(str(message), 'optional_float: 2.0\n')
+    # Python/C++ customizes the C++ TextFormat to always print trailing ".0" for
+    # floats. upb doesn't do this, it matches C++ TextFormat.
+    if api_implementation.Type() == 'upb':
+      self.assertEqual(str(message), 'optional_float: 2\n')
+    else:
+      self.assertEqual(str(message), 'optional_float: 2.0\n')
 
   def testFloatNanPrinting(self, message_module):
     message = message_module.TestAllTypes()
@@ -1662,7 +1667,8 @@ def test_documentation(self):
     doc = pydoc.html.document(unittest_pb2.TestAllTypes, 'message')
     self.assertIn('class TestAllTypes', doc)
     self.assertIn('SerializePartialToString', doc)
-    self.assertIn('repeated_float', doc)
+    if api_implementation.Type() != 'upb':
+      self.assertIn('repeated_float', doc)
     base = unittest_pb2.TestAllTypes.__bases__[0]
     self.assertRaises(AttributeError, getattr, base, '_extensions_by_name')
 
@@ -2258,15 +2264,17 @@ def testMergeFromBadType(self):
     with self.assertRaisesRegex(
         TypeError,
         r'Parameter to MergeFrom\(\) must be instance of same class: expected '
-        r'.+TestMap got int\.'):
+        r'.+TestMap.+got.+int.+',
+    ):
       msg.MergeFrom(1)
 
   def testCopyFromBadType(self):
     msg = map_unittest_pb2.TestMap()
     with self.assertRaisesRegex(
         TypeError,
-        r'Parameter to [A-Za-z]*From\(\) must be instance of same class: '
-        r'expected .+TestMap got int\.'):
+        r'Parameter to (Copy|Merge)From\(\) must be instance of same class: '
+        r'expected .+TestMap.+got.+int.+',
+    ):
       msg.CopyFrom(1)
 
   def testIntegerMapWithLongs(self):

python/pb_unit_tests/BUILD

@@ -21,8 +21,6 @@ pyproto_test_wrapper(name = "message_factory_test")
 
 pyproto_test_wrapper(name = "proto_builder_test")
 
-pyproto_test_wrapper(name = "message_test")
-
 pyproto_test_wrapper(name = "reflection_test")
 
 filegroup(