@Override
    public int hashCode() {
        return toNode().hashCode();
    }
Get the expected response from the service call for this test case.

<p>This expectation can be either a successful response, any error
response, or a specific error response.

@return Returns expectation.
smithy-smoke-test-traits/src/main/java/software/amazon/smithy/smoketests/traits/SmokeTestCase.java