README.md

jest_fs_node_module_mock

Mocking fs node-module with Jest

Mocking File System Node module

This project contains some examples of unit testing with Jest framework and Typescript that ensure the correct functionality of a class that uses the fs node module.

Mock specific module functions:

• readFile
• readFileSync
• writeFileSync

The purpose of these examples is to show:

• How we can falsify the writing and reading files.
• Avoid contamination of the test context.
• Avoid having physical files for tests.
• Be able to alter the content of the files programmatically.
• Spy on functionality.
• Mock functions.

Install

npm install

Execute Test

npm run test