How many types of microservices testing are there?
Microservices Unit Testing
Unit testing for microservices is crucial. It validates whether the microservices behave as per the expectations. For a given microservice, testers write a unit test for internal modules.
Microservice Integration testing
Now, how to ensure how these modules work together to form a microservice. The main goal of this testing is to detect defects in the interface.
It is a process by which microservices testers ensure that the interaction and communication path between the modules and their remote dependencies occur without defects and interruption. Most importantly, developers should write integration testing by using existing unit test frameworks.
Microservices component testing
Microservices component testing aims to test the single microservice in isolation. Testers do this by replacing external collaborating microservices with mock services. For simplification, there is a microservice X, which collaborates with microservice Y.
Now, let’s say you want to do a component test on microservice X. For this, you would replace a microservice Y with a mock service. Then, this Mock microservice integrates with the microservice X. Finally, you would conduct its component test to verify its end-to-end functionality.
By doing so, you may have a controlled testing environment and avoid complexity.
Microservices contract testing
What is a contract between microservices?
It is very crucial yet easy to understand. Let’s say two microservices are collaborating, X and Y.
In this scenario, microservice X seeks some data from a microservice Y. While microservices Y provides the data that the first microservice seeks. Therefore, it forms a contract wherein X is a consumer, and Y is a provider. Contract testing verifies how well the microservices function together. This test is crucial because unit microservice testing, integration, and component microservice testing demonstrate the behaviour of modules and individual microservice. But, this one includes the contracting action of microservices with each other.
Microservices end-to-end testing
End-to-end microservice testing is a method by which software applications’ workflow gets verified end-to-end or from start to end. In other terms, the goal of microservices end-to-end testing is to ascertain how well the entire system performs. Also, this type of testing microservices verifies whether the system as a whole complies with expectations.
Microservice Performance Testing
As soon as the individual microservice gets deployed and start integrating, performance testing becomes essential. In other words, performance microservice testing is crucial in two stages. The one is at the microservice level. And the second one is at the system level.
Tools of microservice testing
Following are the tools for microservice testing:
Challenges of testing microservices
Testing microservices although a significant aspect does pose some challenges as well.
- It may take an unspecified amount of time in the final deployment of software.
- New Software testers can’t be sure 100% which testing strategy would go best and when.
- Here, too many development teams work independently. Thus, it becomes hard to establish a sound coordination system throughout the development process.
- The more microservices there are, the more complex the microservices test becomes.
- Developers face the issue of keeping a record of many database versions and libraries.
Some best practices to do Microservices testing
There are some best practices to test microservices.
- Testers must be clear about what type of testing microservices they should conduct. Also, and on which level they need it.
- They need to ensure that there is an optimal level of security. Or that the software is not vulnerable to attacks.
- Testers must check whether the performance of services complies with expectations.
- The performance of the entire system as a whole should also need verification.