aidl_integration_test: C++ client TestOneway

This case was missing.

Bug: 160191455
Test: atest aidl_integration_test
Change-Id: Iac91450967d87485c54539f82dbc6e43b9a6da60
diff --git a/tests/aidl_test_client_service_exceptions.cpp b/tests/aidl_test_client_service_exceptions.cpp
index 50e5f9c..e9eb049 100644
--- a/tests/aidl_test_client_service_exceptions.cpp
+++ b/tests/aidl_test_client_service_exceptions.cpp
@@ -17,9 +17,15 @@
 #include "aidl_test_client.h"
 #include "gmock/gmock.h"
 
-using testing::Eq;
+TEST_F(AidlTest, onewayNoError) {
+  // oneway servers try to return an error
+  auto status = service->TestOneway();
+  EXPECT_TRUE(status.isOk()) << status;
+}
 
 TEST_F(AidlTest, serviceSpecificException) {
+  using testing::Eq;
+
   for (int32_t i = -1; i < 2; ++i) {
     auto status = service->ThrowServiceException(i);
     ASSERT_THAT(status.exceptionCode(), Eq(android::binder::Status::EX_SERVICE_SPECIFIC));