AREX: It is a “Differential Testing” and “Record and Replay Testing” Tool.

  • Test restful API by record, replay and stub request/response.
  • Differential testing known as differential fuzzing, is a popular software testing technique that attempts to detect bugs, by providing the same input to a series of similar applications and observing differences in their execution.


AREX is under development now.


  • AREX finds potential bugs in your service using running instances of your new code and your old code side by side.
    • AREX behaves as a proxy and multicasts whatever requests it receives to each of the running instances.
    • It then compares the responses, and reports any regressions that may surface from those comparisons.
    • The premise for AREX is that if two implementations of the service return “similar” responses for a sufficiently large and diverse set of requests, then the two implementations can be treated as equivalent and the newer implementation is regression-free.
  • Regression testing is an important stage of testing and an important means to ensure quality.
    • Automated regression testing has high use case maintenance costs.
    • The data of automated testing is difficult and the time cost is high.
    • Fully automatic construction of use cases, automatic recording of interface data in production requests and processing, and automatic construction of test requests and stub data.
    • During regression testing, interface requests are automatically played back, and response packets are parsed.
    • Automatically compare the results, analyze the differences intelligently, and display the differences one by one.
    • Continuous accumulation of regression test cases.


  • Fully automatic recording of requests, internal requests and responses without human intervention.
  • Fully automatic difference comparison, automatically generate report.
  • Accumulate test cases to make regression test coverage close to 100%.


  • The minimum range for recording is one RESTFul interface URL.
  • The TraceID is key field of APM-based that recording and playback, data storage in Mongodb.
  • All use cases belonging to this interface include all TraceID requests + responses + Stub data under this interface URL.


  • The traceid is the smallest unit when Regression Testing execute.
  • In line with the playback target, all matching records can be played back, or some test cases can be filtered out by adding a time range.


  • stub inner request/response.

Run be tested application

AREX install

git pull [email protected]:arextest/dev-ops.git
cd dev-ops
docker-compose up -d

AREX Agent config

  • Method: Set Env
    •; Config your Application Name
    •; YIP is IP address of you AREX HOST

export JAVA_TOOL_OPTIONS="-javaagent:/root/arex/spring-petclinic/"

If you use to Spring-Petclinic try

export JAVA_TOOL_OPTIONS="-javaagent:./arex-devops/agent/;;"
  • Run with Docker
    • –name arex-new Config Docker images Name
    • arex.agent.conf Config you server name and port
docker run  -v "$PWD":/usr/src/arex --rm -p 8080:8080 --name arex-new   -w /usr/src/arex openjdk:11  java -javaagent:/usr/src/arex/arex-agent-0.0.1.jar -Darex.config.path=/usr/src/arex/arex.agent.conf -jar /usr/src/arex/spring-petclinic-2.6.0-SNAPSHOT.jar -m org.springframework.samples.petclinic.PetClinicApplication


Copyright (C) 2022 ArexTest

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU Affero General Public License for more details.

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