Fix serialization of repeated fields with empty messages (#180)

Extend test config and utils to support exclusion of certain json samples from
testing for symetry.

tests/inputs/config.py

@@ -19,3 +19,10 @@ services = {
     "example_service",
     "empty_service",
 }
+
+
+# Indicate json sample messages to skip when testing that json (de)serialization
+# is symmetrical becuase some cases legitimately are not symmetrical.
+# Each key references the name of the test scenario and the values in the tuple
+# Are the names of the json files.
+non_symmetrical_json = {"empty_repeated": ("empty_repeated",)}

tests/inputs/empty_repeated/empty_repeated.json

@@ -0,0 +1,3 @@
+{
+  "msg": [{"values":[]}]
+}

tests/inputs/empty_repeated/empty_repeated.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+message MessageA {
+  repeated float values = 1;
+}
+
+message Test {
+  repeated MessageA msg = 1;
+}

tests/inputs/oneof/test_oneof.py

@@ -5,11 +5,11 @@ from tests.util import get_test_case_json_data
 
 def test_which_count():
     message = Test()
-    message.from_json(get_test_case_json_data("oneof")[0])
+    message.from_json(get_test_case_json_data("oneof")[0].json)
     assert betterproto.which_one_of(message, "foo") == ("pitied", 100)
 
 
 def test_which_name():
     message = Test()
-    message.from_json(get_test_case_json_data("oneof", "oneof_name.json")[0])
+    message.from_json(get_test_case_json_data("oneof", "oneof_name.json")[0].json)
     assert betterproto.which_one_of(message, "foo") == ("pitier", "Mr. T")

tests/inputs/oneof_enum/test_oneof_enum.py

@@ -15,7 +15,7 @@ def test_which_one_of_returns_enum_with_default_value():
     """
     message = Test()
     message.from_json(
-        get_test_case_json_data("oneof_enum", "oneof_enum-enum-0.json")[0]
+        get_test_case_json_data("oneof_enum", "oneof_enum-enum-0.json")[0].json
     )
 
     assert message.move == Move(
@@ -31,7 +31,7 @@ def test_which_one_of_returns_enum_with_non_default_value():
     """
     message = Test()
     message.from_json(
-        get_test_case_json_data("oneof_enum", "oneof_enum-enum-1.json")[0]
+        get_test_case_json_data("oneof_enum", "oneof_enum-enum-1.json")[0].json
     )
     assert message.move == Move(
         x=0, y=0
@@ -42,7 +42,7 @@ def test_which_one_of_returns_enum_with_non_default_value():
 
 def test_which_one_of_returns_second_field_when_set():
     message = Test()
-    message.from_json(get_test_case_json_data("oneof_enum")[0])
+    message.from_json(get_test_case_json_data("oneof_enum")[0].json)
     assert message.move == Move(x=2, y=3)
     assert message.signal == Signal.PASS
     assert betterproto.which_one_of(message, "action") == ("move", Move(x=2, y=3))