Nachos Pillage Milwaukee
Share your code. npm Orgs help your team discover, share, and reuse code. Create a free org »


0.0.34 • Public • Published

Mocha Wrapper

The Mocha Wrapper module makes testing with mocha and assert very easy.


  1. Find untested code via the code coverage report
  2. Get Immediate feedback by rerunning tests as you save
  3. Run smoke test before code push npm test to avoid bad pushes
  4. Get testing immediately using One liner


  1. Ability to run coverage tests anytime without code changes
  2. Package consistency test looks for frequently forgotten items
  3. Automated adding of mocha to your project
  4. Enhanced assertion printouts with message, actual and expected values
  5. Abbreviated stack traces compared to the underlying framework
  6. Resilience against syntax issues in test files

Add to my project NOW

Simply add mocha :)

npm install mochawrapper; node_modules/.bin/addmocha; npm test
> mochawrapper@0.0.18 test /home/foxyboy/Desktop/c505/node/mochawrapper
> mocha --ui exports --reporter spec

The addmocha command updates .gitignore, package.json and the test folder in a safe manner so testing can start immediately from a single dependency.

Imagine yourself, at blood, toil, tears and sweat, supported by the sweet mocha every time you save your work:

npm run-script monitor
  debugger:1 found in 'lib/passportwrapper.js'
Files checked for syntax: javascript:27, json:1 in 0.1 s

  ✔ 8 tests complete (150ms)

  ◡ watching


A project using mochawrapper is tagfinder:

git clone
cd tagfinder
npm install

npm test
npm run-script coverage

The system’s browser displays the test coverage report for tagfinder.

Automatic Coverage Report

npm run-script coverage displays a test coverage report by opening a tab or window in the system’s browser. There is no need to modify any code to run coverage, and you can continuously use it as a guide for further areas to test.


Continuous Testing

npm run-script monitor continuously displays current test results and rerun the tests as you save your sourcefiles.

Test Everything

npm test runs all the tests in the test folder.

Debug Tests

npm run-script debugtest runs all tests using the debugger. By inserting JavaScript’s debugger statement at strategic locations you can run to the exact location where there is something funky going on.

Coverage Report

npm run-script coverage

mochacoverage Preparing an automated test coverage report
mochacoverage Invoking jsCoverage
mochacoverage Running tests
Files checked for syntax: javascript:9, json:1 in 0.1 s
mochacoverage Preparing report
mochacoverage Launching browser
mochacoverage Complete

This does coverage analysis of JavaScript files in the project's lib folder. When complete, Mocha Wrapper launches a new tab in the system default browser containing JavaScript source code. Lines marked red were not executed.

The report can also be invoke using node_modules/.bin/mochacoverage or simply mochacoverage if you have updated your PATH. For both of these methods, you can add a top-level folder other than lib.

Getting jscoverage

The jsCoverage command is required.

jscoverage --version
jscoverage 0.5.1
  • Linux has a jscoverage package: sudo apt-get install jscoverage
  • Windows: jsCoverage site has zip to download
  • Mac: sudo macports install jscoverage
  • There is a github node-jscoverage if you have a C compiler installed.

Regular Test Output

npm test

> tagfinder@0.1.0 test /home/foxyboy/Desktop/c505/node/tf
> mocha --ui exports --reporter spec

  Empty Markup
    ✓ Can compile undefined 
    ✓ Can compile empty string 

    ✓ Can remove html comments 
    ✓ Can find opening tags 
    ✓ Empty attributes 
    ✓ Unquoted attributes 
    ✓ Quoted attributes 
    ✓ Unescaped content: script and textarea 
    ✓ Closing tag in unescaped content 
    ✓ MathML 
    ✓ cdata section 
    ✓ svg 

  Package Consistency:
    ◦ Proper JavaScript and json syntax: Files checked for syntax: javascript:3, json:1 in 0.1 s
    ✓ Proper JavaScript and json syntax (87ms)
    ✓ Package descriptor file 
    ✓ git ignore declaration 
    ✓ Readme 

  ✔ 16 tests complete (102ms)


Add node_modules/.bin to your PATH environment variable to run executable scripts from your modules.

Test Examples

Here are two tests from a test suite. The first test is regular code, and the second test features a callback.

var assert = require('mochawrapper')
exports['Array Length:'] = {
    'array.length returns a number': function () {
        var expected = 'number'
        var actual = typeof [].length
        assert.equal(actual, expected)
    'Testing with callback (asynchronous)': function (done) {
        setTimeout(completeWhenThisExecutes, 100)
        console.log('background complete')
        function completeWhenThisExecutes() {
            console.log('finishing test')

Save the tests as a .js file in the project's test folder.

npm test

> cloudclearing@0.0.2 test /home/foxyboy/Desktop/c505/node/cloudclearing
> mocha --ui exports --reporter spec

  Array Length:
    ✓ array.length returns a number 
    ◦ Testing with callback (asynchronous): background complete
finishing test
    ✓ Testing with callback (asynchronous) (111ms)

  Package Consistency:
    ◦ Proper JavaScript and json syntax: Files checked for syntax: javascript:16, json:1 in 0.1 s
    ✓ Proper JavaScript and json syntax (79ms)
    ✓ Package descriptor file 
    ✓ git ignore declaration 
    ✓ Readme 

  ✔ 7 tests complete (198ms)


© Harald Rudell wrote mochawrapper for node in August, 2012

  • Mochawrapper wraps and extends mocha, a testing framework by TJ Holowaychuk

No warranty expressed or implied. Use at your own risk.

Please suggest better ways, new features, and possible difficulties on github




npm i mochawrapper

Downloadsweekly downloads








last publish


  • avatar