How to test process.on() using mocha?

@cali_green 

To test process.on() using Mocha, you can create a simple test case that listens for a specific event and then trigger that event. Here's an example of how you can do this:

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const assert = require('assert');

describe('process.on()', function() {
  it('should receive and handle the specified event', function(done) {
    process.on('customEvent', function() {
      done();
    });

    // Trigger the custom event
    process.emit('customEvent');
  });
});

In this example, we are using Mocha's describe() and it() functions to define a test case. Within the test case, we use process.on() to listen for a custom event called customEvent. When the event is triggered using process.emit(), the test will pass because the done() function is called inside the event handler.

You can run this test using Mocha and it should pass if the event handling with process.on() is working as expected.