Integration testing in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is integration testing in microservices?

Integration testing checks how different microservices work together as a group, ensuring they communicate and function correctly when combined.

beginner

Why is integration testing important in microservices?

Because microservices are separate parts, integration testing ensures they connect properly, data flows correctly, and the whole system works as expected.

intermediate

Name two common challenges in integration testing microservices.

1. Managing dependencies between services. 2. Handling asynchronous communication and network delays.

intermediate

What is a test double and why is it used in integration testing?

A test double is a fake version of a service used to simulate real behavior, helping isolate parts during testing without calling actual services.

advanced

How does contract testing relate to integration testing in microservices?

Contract testing verifies that services agree on the data format and communication rules, which supports integration testing by preventing mismatches.

What is the main goal of integration testing in microservices?

A To test individual service logic in isolation

B To deploy services to production

C To check how services work together

D To monitor service performance

Integration testing focuses on verifying the interaction between multiple services, not just individual logic.

Which of the following is a common tool used for integration testing microservices?

A JUnit

B Docker Compose

C Postman

D Git

Docker Compose helps run multiple services together locally, making it useful for integration testing.

What does a test double replace during integration testing?

A Real service dependencies

B Database schema

C User interface

D Network hardware

Test doubles simulate real services to isolate tests and avoid calling actual dependencies.

Which problem does contract testing help prevent in microservices integration?

A Memory leaks

B Service downtime

C Slow network speed

D Data format mismatches

Contract testing ensures services agree on data formats and communication rules, preventing mismatches.

What is a key challenge when integration testing asynchronous microservices?

A Managing network delays and message order

B Deploying services

C Writing unit tests

D Handling synchronous calls

Asynchronous communication can cause delays and out-of-order messages, which complicates integration testing.

Explain how integration testing fits into the microservices development lifecycle.

Think about when and why teams test combined services.

Describe common strategies to handle dependencies during microservices integration testing.

Consider how to simulate or control other services.