Need to do this separately after test/adaptive_load/utility.h goes in.

The helper should do:
EXPECT_EQ(message->DebugString(), expected_config.DebugString());
EXPECT_TRUE(Envoy::MessageUtil()(*message, expected_config));

oschaaf:
I learned that with proto3 default values may not get serialised. I'm not 100% sure that equivalence here guarantees actual equivalence with respect to set/not-set/default-value. Therefore, to make sure no edge cases slip past, maybe it makes sense to also double down with MessageUtil()(message1, message1). This won't produce a helpful test message, so I'd put it after comparing the debug strings (which should produce a nice diff), maybe in a helper method.