Test-error NPM

test-error

This module provides a simple function that can be used in assert.throws to verify that an error is an instance of a particular class, and/or that its message has specific content.

Example

'use strict'

const assert = require('assert');
const testError = require('test-error');

// ...

describe('suite', function() {
  it('should throw a TypeError', function() {
    assert.throws(() => testMe(),
                  err => testError(err, TypeError, 'missing argument'));
  });
}); // suite

Installation

npm install test-error

Usage

testError(error, constructor, msgCheck)

error {Error} The error instance to be tested.
constructor {Function} Optional class of which error must be an instance. If not provided the parentage of error is not tested.
msgCheck {String|RegExp} Optional content expected in error.message. If a String is provided, the String must appear within error.message (at any position). If a RegExp is provided, its test method must accept error.message. If not provided the value of error.message is not tested.

Returns false if a provided constructor or msgCheck verification fails, true otherwise.