Add tests for generated-cpp-source & json serdes

tests/cpp-serdes/government_address_roundtrip_test.cpp

@@ -0,0 +1,27 @@
+#include <gtest/gtest.h>
+
+#include <cppbessot/model/GovernmentAddress.h>
+
+#include "test_helpers.h"
+
+TEST(GovernmentAddressJsonSerdes, RoundTripsViaJson)
+{
+  models::GovernmentAddress original{};
+  original.id = "gov-addr-42";
+  original.addressLabel = "District Office";
+  original.regionLookupKey = "region-west";
+
+  const nlohmann::json expected = {
+    {"id", "gov-addr-42"},
+    {"addressLabel", "District Office"},
+    {"regionLookupKey", "region-west"},
+  };
+
+  const nlohmann::json serialized = original.toJson();
+  expect_json_roundtrip_equal(serialized, expected);
+
+  const models::GovernmentAddress reparsed = models::GovernmentAddress::fromJson(serialized);
+  EXPECT_EQ(reparsed.id, original.id);
+  EXPECT_EQ(reparsed.addressLabel, original.addressLabel);
+  EXPECT_EQ(reparsed.regionLookupKey, original.regionLookupKey);
+}