How to test for a specific error message in mocha?

@samara 

To test for a specific error message in Mocha, you will need to use assertions provided by an assertion library such as Chai. Here's an example of how you can test for a specific error message in Mocha using Chai:

1. Install Chai assertion library if you haven't already:

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npm install chai

1. Import Chai and the expect function in your test file:

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const { expect } = require('chai');

1. Write a test that expects a specific error message to be thrown:

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describe('MyFunction', () => {
  it('should throw an error with a specific message', () => {
    expect(() => {
      // Call the function that is expected to throw an error
      myFunction();
    }).to.throw('Specific error message');
  });
});

In this test, the expect function is used to check if calling myFunction results in throwing an error with a specific message. The to.throw function is used to assert that the error message matches the one provided.

Make sure to replace myFunction and 'Specific error message' with the actual function and error message you are testing for.