power-assert-formatter

What is power-assert-formatter?

The power-assert-formatter npm package is a tool used to format assertion messages in a more readable and expressive way. It is part of the power-assert family, which aims to provide better assertion messages for JavaScript testing.

What are power-assert-formatter's main functionalities?

Customizable Output

This feature allows you to customize the output of assertion messages. You can set options like `lineDiffThreshold` and `maxDepth` to control how detailed the output should be.

const assert = require('assert');
const formatter = require('power-assert-formatter');

const options = {
  lineDiffThreshold: 5,
  maxDepth: 3
};
const format = formatter(options);

try {
  assert.equal(1, 2);
} catch (e) {
  console.log(format(e));
}

Enhanced Assertion Messages

This feature enhances the default assertion messages to make them more readable and informative. It provides a clear and detailed explanation of why the assertion failed.

const assert = require('assert');
const formatter = require('power-assert-formatter');

const format = formatter();

try {
  assert.strictEqual(1, 2);
} catch (e) {
  console.log(format(e));
}

Integration with Testing Frameworks

This feature allows you to integrate power-assert-formatter with popular testing frameworks like Mocha. It helps in providing better assertion messages within the context of your tests.

const assert = require('assert');
const formatter = require('power-assert-formatter');
const mocha = require('mocha');

const format = formatter();

mocha.describe('Sample Test', function() {
  mocha.it('should fail', function() {
    try {
      assert.strictEqual(1, 2);
    } catch (e) {
      console.log(format(e));
    }
  });
});

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README

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