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JavaScript Mocking Fundamentals on TestingJavaScript.com

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JavaScript Mocking Fundamentals

Name: js-mocking-fundamentals
Brand: js-mocking-fundamentals
SKU: //kentcdodds/js-mocking-fundamentals
Rating: 2.18 (172 reviews)

TestingJavaScript.com

Learn the smart, efficient way to test any JavaScript application.

Learn how mocking in JavaScript tests works by implementing them from scratch!

In this material, we have a set of

no-framework

tests that correspond to a set of jest tests (in the

__tests__

directory). The idea is that (with the exception of the first test), you look at the jest version first, then see how that would be implemented without a testing framework.

Order of material:

```
monkey-patching.js
```
(no jest version)
```
mock-fn.js
```
```
spy.js
```
```
inline-module-mock.js
```
```
external-mock-module.js
```

The files are intended to test the

thumb-war.js

module and mock the

utils

module.

To run the tests, run

npx jest

. To start watch mode run

npx jest --watch

Custom jest runner.

You can definitely run the

no-framework

files just using

node

(like this:

node src/no-framework/monkey-patching.js

), but in an effort to make running these easier, I created a custom jest runner that uses jest to run the files, but allow them to be run without the jest testing framework. It's really cool. It uses

create-jest-runner

and should probably be published eventually.