@Override
    protected AWSAppTest build(AwsSyncClientParams params) {
        return new AWSAppTestClient(params);
    }
Construct a synchronous implementation of AWSAppTest using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AWSAppTest.
aws-java-sdk-apptest/src/main/java/com/amazonaws/services/apptest/AWSAppTestClientBuilder.java