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Regression Testing in a Microservices Architecture

 It is a testing method that verifies whether new changes or updates made to the code do not alter or modify the existing functionalities of the software application. There can be scenarios wherein modification or amendment can introduce new bugs in the software. Similarly, a slight change in functionality can re-introduce older bugs. Hence, regression testing is conducted to make sure that post-changes done to the application should not alter the core functionality.  

Any new code that has been added to the program should not disrupt the existing features and functions. Whenever there are changes in functionality, upgrades, updates etc., it is better to conduct regression testing. 

 

What is a microservices architecture? 

Microservices refers to an application that has been further divided into autonomous components. Microservices can easily communicate via shared database records, common files, event queues or REST APIs. A major impact on quality can be witnessed by the communication mechanism between microservices. Each microservice will have its own test pipeline, a separate build and its own development team including some of the following test types: 

  • Regression tests 
  • End-to-end/integration tests 
  • Functional tests 
  • Unit tests
  • Manual tests 
  • Exploratory tests. 

 

The relevance of regression testing in microservices architecture: 

There are many developers who have understood the value of microservices and hence is considered to be one of the important architectural approaches. A part of the business is implemented by each microservice, which is considered to be completely independent. Each microservice can be scaled, updated and deployed without other microservices getting impacted and the entire process is automated. 

Continuous delivery plays a crucial role in the development process of microservice-based systems. Software reliability is one of the key challenges of automatic deployment of new releases to the production environment. To ensure software reliability, a regression test is considered to be a viable platform wherein two system versions are compared based on various metrics. The operability of the last developed version is properly tested by regression testing. 

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