How can I effectively address process.on test in TypeScript Mocha Testing with the help of a Sinon Spy?

I need to conduct a test on the warning process for my Typescript project. The specific code that I am attempting to test is shown below:

process.on('warning', (warning) => {
    LoggingService.info('Warning, Message: ' + warning.message + ' Stack: ' + warning.stack, 'warning');
});

To carry out the test, I am utilizing sinnon.spy in the following manner:

it('Verify warning process', (done) => {
        const spy = sinon.spy(LoggingService, 'info');
        process.on('uncaughtException', () => {
            sinon.assert.calledWith(spy, "warning")
            done()
        })
        process.emit('warning')
    })

However, I encountered an error with the test case above:

Argument of type '"warning"' is not assignable to parameter of type '"disconnect"'.

How can I go about resolving this error, given that the warning process is defined in the code under test? Any assistance would be truly appreciated!

typescriptunit-testingmocha.jssinonspy

Answer №1

To effectively stub the method process.on and its implementation, it is recommended to utilize sinon.stub.

For example:

index.js:

process.on('warning', (warning) => {
  console.info('Warning, Message: ' + warning.message + ' Stack: ' + warning.stack, 'warning');
});

index.test.js:

const sinon = require('sinon');

describe('63119397', () => {
  afterEach(() => {
    sinon.restore();
  });
  it('should print warning message', () => {
    const warning = {
      message: 'go',
      stack: 'go:13',
    };
    sinon.stub(process, 'on').callsFake((event, callback) => {
      callback(warning);
    });
    const infoSpy = sinon.spy(console, 'info');
    require('./');
    sinon.assert.calledWith(process.on, 'warning', sinon.match.func);
    sinon.assert.calledWith(infoSpy, 'Warning, Message: go Stack: go:13', 'warning');
  });
});

The unit test outcome shows a 100% coverage report:

  63119397
Warning, Message: go Stack: go:13 warning
    ✓ should print warning message (796ms)


  1 passing (808ms)

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |     100 |      100 |     100 |     100 |                   
 index.js |     100 |      100 |     100 |     100 |                   
----------|---------|----------|---------|---------|-------------------

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