The new constant pressure on technology to adopt and align themselves to dynamic changing need to business surroundings. Current trend demands larger scalability, cross-platform capabilities, and quicker deliveries. Microservices architecture helps organizations produce decoupled and independent processes and services that are easier to deploy and manage. The aim isn’t have inter-modular dependencies. Thus quicker releases are facilitated by separating the application in smaller components that can be composed easily, and independently.
The applications developed with microservices architecture thus, is the sum of these individual components that communicate freely with one another and deliver greater functionality. Since when the application components are independent of one another it makes them independently deployable and testable as well. Henceforth Designing a testing strategy for Microservices can be challenging. It’s demand the right use of tools, technologies, and frameworks to provide support to every testing layer. The independent micro-units should be completely tested before integration with the larger application or application scheme. Otherwise, the value of correction post integration can be huge.
Challenges in Microservices Testing:
microservices development is distributed and independent in nature, testing ways that applied to monolithic architectures cannot apply here. Microservices applications have to deliver on high performance and functionalities, which has demands that every layer of the application is totally tested. few challenges faced during microservices testing are:
- Desire use Web API testing tools that are typically built around SOA testing.
- Timely handiness of all services for testing since these services are developed by different teams.
- Since the services are depend on independent of one another despite being a part of an interconnected structure it becomes essential to test each component individually and also as a complete system.
- Dependencies on other services for data and layered interactions, makes end to end flows challenging to accomplish.
- Complicated collection of logs during testing and data.
To overcome the challenges in Microservices testing and in automating that testing, it helps to adopt a bottom-up approach to testing portrayed in Mike Cohn’s Testing Pyramid. This approach helps in identifying how much automation effort must be factored in at every stage of the testing process.
- On unit testing approach demands on solitary unit testing and sociable unit testing. At the same time, both items imperative to ascertain that testing of the behavior under test does not constrain the implementation. This can be achieved by continuesly questioning the value a unit test provides in comparison to the maintenance costs or the number of implementation constraints.
- Contract testing is essential to check the communication while the internal implementation of services remains independent. The API’s and interfaces remain consistent as well. API’s can be subject to change when the service is exposed, it becomes key to define a contract for the API. While we automating contract testing, testing teams can check if the agreed contract is well preserved and that the input and output of service calls meet the contract expectation.
- Microservices in integration testing ensure the several communication paths and service components modules under test collaborate as intended. Aim of integration test is check the behavior of the unit being tested and not the entire subsystem. While automating it is essential to write the tests for the modules that interact with external components to ascertain that the module can communicate clearly with those external components. Gateway integration and persistence integration tests provide fast feedbacks by assessing the correctness of logic by assessing the logic regressions and identifying breakage between external components.
Service visualisation is used when you are testing end-to-end system and some microservices are not ready. Along with this, testing teams also can look at automating UI and Functional testing to ensure all interfaces/databases/third-party/internal sources, can work seamlessly and in a cohesive manner with one another. With the scope of microservices automation testing testers can also leverage scriptless test automation to simplify the process and get the test automation ball rolling faster to test each component with greater fidelity to deliver a thoroughly tested and superior microservices product.