Identify the failing test cases externally using JavaScript

Question

Identify the failing test cases externally using JavaScript

I am currently tackling an issue where I am seeking to identify the specific test cases that fail when running a test suite for any javascript/node.js application. Finding a programmatic solution is crucial for this task.

Mocha testsuite output result

For instance, let's consider the test output shown above. In this scenario, I aim to develop an external JavaScript script that can pinpoint the exact test case that failed.

At present, my concept revolves around executing npm test in a child process of JavaScript and capturing its output from the standard output stream. The idea is to parse the output and extract the necessary details, as illustrated below:

const { spawn } = require('child_process');
const chalk = require('chalk');
const child = spawn('npm.cmd',['test']);

line = 0
child.stdout.on('data', (data) => {
  console.log(`${chalk.bgBlue('line = ' + line)} , data = ${data}`);
  line++;
});

Despite this being a viable approach, it may seem quite rigid. My preference would be to adopt a more versatile method that works across various test modules beyond just Mocha.

Your assistance on this matter would be highly valued! Thank you.

javascript unit-testing testing mocha.js

Answer 1

Answer №1

If you want to access the state of each test after it has been executed, you can use the following code snippet. This will allow you to determine whether a test passed or failed:

afterEach(function () {
        const state = this.currentTest.state;
        if (state !== "passed") {
            //Do whatever you want with this value
        }
    });

For instance, if you need to keep track of which tests have failed, you can modify the code like so:

var testFailed = []
describe('test', function () {

    afterEach(function () {
        const state = this.currentTest.state;
        if (state !== "passed") {
            testFailed.push(this.currentTest.title)
        }
    });

    after(function(){
        console.log(testFailed)
    })

    it('test1', () => {
        assert.equal(1, 1)

    });
    it('test2', () => {
        assert.equal(1, 2)
    });
})

The resulting output would be:

  test
    √ test1       
    1) test2      
[ 'test2' ]       


  1 passing (15ms)
  1 failing

You have the flexibility to utilize this information as needed. Whether you want to manipulate the variable for further actions or store the data in a file, the choice is yours.

Answer 2

If you want to access the state of each test after it has been executed, you can use the following code snippet. This will allow you to determine whether a test passed or failed:

afterEach(function () {
        const state = this.currentTest.state;
        if (state !== "passed") {
            //Do whatever you want with this value
        }
    });

For instance, if you need to keep track of which tests have failed, you can modify the code like so:

var testFailed = []
describe('test', function () {

    afterEach(function () {
        const state = this.currentTest.state;
        if (state !== "passed") {
            testFailed.push(this.currentTest.title)
        }
    });

    after(function(){
        console.log(testFailed)
    })

    it('test1', () => {
        assert.equal(1, 1)

    });
    it('test2', () => {
        assert.equal(1, 2)
    });
})

The resulting output would be:

  test
    √ test1       
    1) test2      
[ 'test2' ]       


  1 passing (15ms)
  1 failing

You have the flexibility to utilize this information as needed. Whether you want to manipulate the variable for further actions or store the data in a file, the choice is yours.

Identify the failing test cases externally using JavaScript

Answer №1

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