How to use fs in mocha unit tests?

@cortez.connelly 

To use the fs module in Mocha unit tests, you can require it in your test files and use it just like you would in regular Node.js code. Here's an example of how you can use fs in a Mocha unit test:

1. Install Mocha and Chai (optional) if you haven't already:

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npm install mocha chai --save-dev

1. Create a new test file, for example fs.test.js, and require the fs module at the top of the file:

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const fs = require('fs');
const { expect } = require('chai'); // Optional - for assertion

1. Write your tests using fs methods. For example, you can test if a file exists:

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describe('File system tests', () => {
  it('should check if file exists', () => {
    const path = 'path/to/your/file.txt';

    // Use fs.existsSync to check if the file exists
    const fileExists = fs.existsSync(path);

    // Assert that the file exists
    expect(fileExists).to.be.true;
  });
});

1. Run the tests using Mocha:

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npx mocha fs.test.js

This is just a simple example to demonstrate how you can use the fs module in Mocha unit tests. You can write more complex tests using other fs methods and assertions provided by libraries like Chai.