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testdouble.js

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Welcome! Are you writing JavaScript tests and in the market for a mocking library to fake out real things for you? testdouble.js is an opinionated, carefully-designed test double library maintained by, oddly enough, a software agency that's also named Test Double.

If you practice test-driven development, testdouble.js was designed to promote terse, clear, and easy-to-understand tests. There's an awful lot to cover, so please take some time and enjoy our documentation, which itself is designed to show you how to make the most out of test doubles in your tests.

Coming from Sinon.js?

Right now, Sinon.js is the test double incumbent in JavaScript, with over 1.7 million downloads in the last month. If you've got experience with Sinon, check out our side-by-side comparison to see why we wrote testdouble.js and how some of the API translates.

The Very Basics

Before diving into our in-depth docs, here are a couple demo GIFs of the basic uses:

Stubbing return values for functions

simple stubbing example animation

Verifying a function was invoked

simple verification of a function invocation

Docs

All of our docs are in the docs/ directory inside this repository and numbered for easy reading in the priority-order we anticipate people needing them. Here's a rough outline:

  1. Installation
  2. for Node.js
  3. for browsers
  4. initial configuration
  5. Purpose of testdouble.js
  6. in unit tests
  7. in integration tests
  8. Getting started tutorial
  9. Creating test doubles
  10. test double functions with td.function()
  11. test double objects with td.object() 1. objects that mirror a constructor function 2. objects that mirror an object of functions 3. object of functions for an array of names 4. object of any functions using ES2015 Proxy
  12. Stubbing responses
  13. td.when() API
  14. equality argument matching
  15. one-liner stubbings
  16. stubbing sequential return values
  17. argument matchers 1. td.matchers.anything() 2. td.matchers.isA() 3. td.matchers.contains()
    1. matching strings
    2. matching arrays
    3. matching objects 4. td.matchers.argThat() 5. td.matchers.not()
  18. Stubbing callback APIs
  19. Stub exceptions with thenThrow
  20. Stub side effects with thenDo
  21. Configuring stubbings 1. ignoreExtraArgs 2. times
  22. Verifying invocations
  23. td.verify() API
  24. equality argument matching
  25. argument matchers 1. td.matchers.anything() 2. td.matchers.isA() 3. td.matchers.contains()
    1. matching strings
    2. matching arrays
    3. matching objects 4. td.matchers.argThat()
  26. Argument captors
  27. Configuring verifications 1. ignoreExtraArgs 2. times
  28. Replacing dependencies with test doubles
  29. for Node.js
  30. for Browser JS
  31. td.replace() API
  32. Writing custom argument matchers
  33. Debugging with testdouble.js
  34. td.explain() API
  35. Plugins
  36. testdouble-chai
  37. testdouble-jasmine
  38. Frequently Asked Questions
  39. Why doesn't td.replace() work with external CommonJS modules?

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A minimal test double library for TDD with JavaScript

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