Test Service instantiation as part of standard test-case

betterproto/tests/inputs/service/service.proto

@@ -10,6 +10,6 @@ message DoThingResponse {
   int32 successfulIterations = 1;
 }
 
-service ExampleService {
+service Test {
   rpc DoThing (DoThingRequest) returns (DoThingResponse);
 }

betterproto/tests/inputs/service/test_service.py

@@ -7,7 +7,7 @@ from typing import Dict
 from betterproto.tests.output_betterproto.service.service import (
     DoThingResponse,
     DoThingRequest,
-    ExampleServiceStub,
+    TestStub as ExampleServiceStub,
 )
 
 
@@ -29,12 +29,12 @@ class ExampleService:
 
     def __mapping__(self) -> Dict[str, grpclib.const.Handler]:
         return {
-            "/service.ExampleService/DoThing": grpclib.const.Handler(
+            "/service.Test/DoThing": grpclib.const.Handler(
                 self.DoThing,
                 grpclib.const.Cardinality.UNARY_UNARY,
                 DoThingRequest,
                 DoThingResponse,
-            )
+            ),
         }
 
 
@@ -99,7 +99,7 @@ async def test_service_call_lower_level_with_overrides():
     ) as channel:
         stub = ExampleServiceStub(channel, deadline=deadline, metadata=metadata)
         response = await stub._unary_unary(
-            "/service.ExampleService/DoThing",
+            "/service.Test/DoThing",
             DoThingRequest(ITERATIONS),
             DoThingResponse,
             deadline=kwarg_deadline,
@@ -123,7 +123,7 @@ async def test_service_call_lower_level_with_overrides():
     ) as channel:
         stub = ExampleServiceStub(channel, deadline=deadline, metadata=metadata)
         response = await stub._unary_unary(
-            "/service.ExampleService/DoThing",
+            "/service.Test/DoThing",
             DoThingRequest(ITERATIONS),
             DoThingResponse,
             timeout=kwarg_timeout,

betterproto/tests/mocks.py

@@ -5,7 +5,7 @@ from grpclib.client import Channel
 
 class MockChannel(Channel):
     # noinspection PyMissingConstructor
-    def __init__(self, responses: List) -> None:
+    def __init__(self, responses: List = []) -> None:
         self.responses = responses
         self.requests = []
 

betterproto/tests/test_inputs.py

@@ -9,6 +9,7 @@ import pytest
 
 import betterproto
 from betterproto.tests.inputs import xfail
+from betterproto.tests.mocks import MockChannel
 from betterproto.tests.util import get_directories, get_test_case_json_data, inputs_path
 
 # Force pure-python implementation instead of C++, otherwise imports
@@ -113,6 +114,12 @@ def test_message_json(repeat, test_data: TestData) -> None:
         assert json.loads(json_data) == json.loads(message_json)
 
 
+@pytest.mark.parametrize("test_data", test_cases.services, indirect=True)
+def test_service_can_be_instantiated(test_data: TestData) -> None:
+    plugin_module, _, json_data = test_data
+    plugin_module.TestStub(MockChannel())
+
+
 @pytest.mark.parametrize("test_data", test_cases.messages_with_json, indirect=True)
 def test_binary_compatibility(repeat, test_data: TestData) -> None:
     plugin_module, reference_module, json_data = test_data