mathjs/test/error/index.test.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

var assert = require('assert'),
    error = require('../../lib/error/index');

describe('index.js', function () {

  it('should contain error namespace', function () {
    assert.equal(typeof error, 'object');
    assert('ArgumentsError' in error);
    assert('DimensionError' in error);
    assert('IndexError' in error);
    assert('UnsupportedTypeError' in error);
  });

});