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rewire

Easy dependency injection for node.js unit testing

  • 7.0.0
  • unpublished
  • latest
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  • npm
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304K
decreased by-17.72%
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What is rewire?

Rewire is a testing utility for Node.js that allows you to modify the behavior of a module by overriding its private variables and functions. This is particularly useful for unit testing, as it enables you to test private functions and mock dependencies.

What are rewire's main functionalities?

Accessing Private Variables

This feature allows you to access private variables within a module. In the code sample, `privateVar` is a private variable in `myModule` that is accessed using `__get__`.

const rewire = require('rewire');
const myModule = rewire('./myModule');
const privateVar = myModule.__get__('privateVar');
console.log(privateVar);

Mocking Private Functions

This feature allows you to mock private functions within a module. In the code sample, `privateFunction` is a private function in `myModule` that is mocked using `__set__`.

const rewire = require('rewire');
const myModule = rewire('./myModule');
myModule.__set__('privateFunction', function() { return 'mocked'; });
console.log(myModule.somePublicFunction());

Mocking Dependencies

This feature allows you to mock dependencies of a module. In the code sample, `dependency` is a dependency of `myModule` that is mocked using `__set__`.

const rewire = require('rewire');
const myModule = rewire('./myModule');
myModule.__set__('dependency', { someMethod: () => 'mocked' });
console.log(myModule.somePublicFunction());

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Package last updated on 13 Aug 2023

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