|  | @@ -152,7 +152,9 @@ class HijackingInterceptor : public experimental::Interceptor {
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				|  |  |        EchoRequest req;
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				|  |  |        auto* buffer = methods->GetSendMessage();
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				|  |  |        auto copied_buffer = *buffer;
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				|  |  | -      SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req);
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				|  |  | +      EXPECT_TRUE(
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				|  |  | +          SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req)
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				|  |  | +              .ok());
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				|  |  |        EXPECT_EQ(req.message(), "Hello");
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				|  |  |      }
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				|  |  |      if (methods->QueryInterceptionHookPoint(
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				|  | @@ -255,7 +257,9 @@ class HijackingInterceptorMakesAnotherCall : public experimental::Interceptor {
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				|  |  |        EchoRequest req;
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				|  |  |        auto* buffer = methods->GetSendMessage();
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				|  |  |        auto copied_buffer = *buffer;
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				|  |  | -      SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req);
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				|  |  | +      EXPECT_TRUE(
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				|  |  | +          SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req)
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				|  |  | +              .ok());
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				|  |  |        EXPECT_EQ(req.message(), "Hello");
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				|  |  |        req_ = req;
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				|  |  |        stub_ = grpc::testing::EchoTestService::NewStub(
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				|  | @@ -367,7 +371,9 @@ class LoggingInterceptor : public experimental::Interceptor {
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				|  |  |        EchoRequest req;
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				|  |  |        auto* buffer = methods->GetSendMessage();
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				|  |  |        auto copied_buffer = *buffer;
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				|  |  | -      SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req);
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				|  |  | +      EXPECT_TRUE(
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				|  |  | +          SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req)
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				|  |  | +              .ok());
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				|  |  |        EXPECT_TRUE(req.message().find("Hello") == 0);
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				|  |  |      }
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				|  |  |      if (methods->QueryInterceptionHookPoint(
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