How to test node.js websocket server with mocha?

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by dedrick , in category: Javascript , 3 months ago

How to test node.js websocket server with mocha?

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1 answer

by giovanny.lueilwitz , 3 months ago

@dedrick 

To test a Node.js websocket server with Mocha, you can use a testing library such as chai to make assertions on the behavior of your websocket server. Here's a basic example of how you can test a websocket server using Mocha:

  1. Install Mocha and Chai:
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npm install mocha chai --save-dev


  1. Create a test file (test/websocket.test.js) with the following content:
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const WebSocket = require('ws');
const { expect } = require('chai');

describe('Websocket Server', function() {
  let websocketServer;

  before(function() {
    // Start your websocket server before running tests
    websocketServer = new WebSocket.Server({ port: 8080 });
  });

  after(function() {
    // Close the websocket server after running tests
    websocketServer.close();
  });

  it('should receive a message', function(done) {
    const client = new WebSocket('ws://localhost:8080');
    
    client.on('open', function() {
      client.send('Hello, Server!');
    });
    
    websocketServer.on('connection', function(ws) {
      ws.on('message', function(message) {
        expect(message).to.equal('Hello, Server!');
        client.close();
        done();
      });
    });
  });
});


  1. Update your package.json file to include the test script:
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"scripts": {
  "test": "mocha"
}


  1. Run your tests:
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npm test


This is a basic example to get you started with testing a Node.js websocket server with Mocha. You can expand upon this by testing additional functionality, handling errors, and mocking external dependencies.