TypeScript Integration Testing

Mocking Dependencies you own this product

This project is part of the liveProject series TypeScript Integration Testing with Nest Framework
prerequisites
basic TypeScript • basic Jest
skills learned
use SQLite and an in-memory database to inspect the results of service execution • mock S3 containers
Daniel Coleman and Max Guernsey, III
1 week · 2-4 hours per week · INTERMEDIATE
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Look inside

Create an alarm system that warns you before your system breaks. You’re a TypeScript developer for a large company that sells stock photography. You’re responsible for the service that ingests images. A recent upgrade to the image-scaling library has caused a problem with the aspect ratio of thumbnail images. Working in IntelliJ WebStorm, you’ll build a layer of integration tests that replicates the problem and also tests the assumptions that your unit tests rely on. When you’re done, you’ll have an alarm system that warns you when the assumptions your unit tests rely on are no longer valid, preventing problems in the future.

This project is designed for learning purposes and is not a complete, production-ready application or solution.

book resources

When you start your liveProject, you get full access to the following books for 90 days.

project authors

Daniel Coleman

Daniel Coleman has been writing software since he was twelve years old, and has been getting paid for it for the last ten years. He quickly progressed from individual contributor to trailblazer for software design excellence, turning his teammates into fellow disciples of high quality. Dan has also worked as an embedded coach for teams, helping them perfect their craft through best practices for code design, test-driven development, behavior-driven development, and effective requirements management. He shares his thoughts on the industry and software design at agiledesign.io.

Max Guernsey, III

Max Guernsey has over twenty years of experience in software development and is currently a managing member at DevCraft LLC. He has worked on a wide range of products and technologies, including C++ class libraries, financial analysis applications, C# and Java backends, and even multi-platform video games. He is an experienced consultant and his "coaching from the keyboard" approach provides hands-on experience to learners in all aspects of modern software development.

prerequisites

This liveProject is for developers with an intermediate-level understanding of TypeScript and object-oriented design. To begin these liveProjects you’ll need to be familiar with the following:

TOOLS
  • Basic Jest
  • Basic Nest.js
  • Basic SQLite
  • Working knowledge of TypeScript
  • Working knowledge of object-oriented programming

you will learn

In this liveProject, you’ll learn to build a layer of integration tests that replicates an otherwise unreproducible problem and also tests the assumptions that your unit tests rely on, creating an alarm system that warns you when those assumptions are no longer valid.

  • Use IntelliJ WebStorm to write and execute tests
  • Reproduce problems in hard-to-reach parts of a system with tests
  • Use tests to drive bug fixes
  • Use SQLite and an in-memory database to inspect the results of service execution
  • Mock S3 containers

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book resources
Get full access to select books for 90 days. Permanent access to excerpts from Manning products are also included, as well as references to other resources.

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