a simple javascript code coverage tool with browser frontend
Last updated 8 years ago by wolfgangkluge .
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$ cnpm install coveraje 
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a simple javascript code coverage tool...


coveraje provides only few public functions

coveraje.cover(code, runner, options, callback)

code string || function
the code that should be tested. if it's a function, it should return a string this function is called, everytime the page is refreshed (F5)

runner function | { key: function }
This parameter takes a runner-function, or an object with multiple runners.
If it's an object with multiple runners, the key should be descriptive (it's used to distinguish between the runners). The runner/s is/are called from coveraje.

function runner(context, instance){ // code to run }

Each runner is called with two arguments.  
    - __context__ the global scope of the executed code  
    - __instance__ the coveraje instance  
In order to get asynchronous tests run until the end, you have to use  


return coveraje.runHelper.createEmitter(function (event) { // test code, e.g. require("fs").readFile("path", function (err, data) { event.complete(); }) })

as your runner code. Don't use `setTimeout/setInterval` in your test directly. Use `context.setTimeout`/`context.setInterval` instead.  
Don't forget `event.complete();`.

`options` _{ key: value }_  
Currently, there are the following options  

> `beautify` _boolean_  
>     if true, the code to inspect will be beautified (by uglifyjs) first  
>     All comments are stripped by the beautifier.  
>     _default_: __false__  
> `colorizeShell` _boolean_  
>     if true, uses ANSI escape sequences to color the console output  
>     In case you get wierd text in your console, turn it off...  
>     _default_: __true__  
> `globals` _"node"_, _"browser"_, or any combination  
>     defines, which global objects are defined. the modes can be combined (separated with blanks).  
>     "browser" requires jsdom (which has some known problems on windows (*contextify*))  
>     _default_: __""__  
> `prefix` _string_  
>     while injecting code, also some variables has to be defined. These are prefixed so they don't interfere with the variables defined in code. Usually, you don't have to change this prefix, unless you have variables starting with `_cj$_`.  
>     _default_: __"\_cj$\_"__  
> `quiet` _boolean_  
>     if true, suppress output to console  
>     _default_: __false__  
> `resolveRequires` _[string - array]_  
>     if `globals` contains "node" and you use `require` in your source, this array is used to determine if the loaded module should be covered, too.  
>     for now, this only works for relative or absolute paths as the require-parameter  
>     you can also add "*" to this array, so it resolves every required file  
>     _default_: __[]__  
> `serverHost` _string_  
>     the host to use if `useServer = true`  
>     _default_: __""__  
> `serverPort` _int_  
>     the port to use if `useServer = true`  
>     _default_: __13337__  
> `stripFirstComments` _boolean_  
>     removes all starting comments from the code. You won't always scroll to the first line of code ;)  
>     _default_: __true__  
> `stripSheBang` _boolean_  
>     removes `\#!...` if it's in the first line  
>     _default_: __true__  
> `useServer` _boolean_  
>     starts a web server to provide the results in your favorite browser.  
>     You are able to start every or a single runner and see the results  
>     _default_: __false__  
> `wait` _int_  
>     if the code uses `setTimeout/setInterval`, you can wait some time before the results are generated.  
>     It's better to use `coveraje.runHelper.createEmitter()`.  
>     _default_: __0__  

the callback function is called after all requested runners are finished.  
it takes one argument, the coveraje instance.  With this you can e.g. create reports  

function onComplete(instance) {


coveraje needs

  • Node.js
    The runtime. A version that runs in browsers only is on the agenda.

  • UglifyJS


  • JQuery
    The web interface uses jquery (latest version is loaded from jQuery CDN)

  • JSDom
    Depending on the configuration (option globals), jsdom (and its dependencies) is used.
    Currently it does not work well on Windows (blame on contextify) - but it should work in the near future (promised for version 0.3.0)

  • expresso
    if you choose the expresso helper, you will need expresso ;)

  • nodeunit
    if you choose the nodeunit helper, you will need nodeunit...

  • mocha
    if you choose the mocha helper, you will need mocha...


  • JSHint
    all js-files are linted by jshint, so it's needed for the tests

TDD Frameworks:

If you have unit tests (you should) and want to know how they cover your source code, you may try it with a helper to create a test runner.
Currently there are helpers for expresso, nodeunit, and mocha.

To use such a helper, you have to define runners like in the following example.

function test() {                       // the runner, has to be used in cover() function
    return function (context) {
        return coveraje.runHelper(      // It's vital to return the result
            "name",                     // name of the helper, e.g. "mocha"
            options                     // helper options, see comment in lib/helper/... for more details
        ).run(relativePathToTestFile);  // the (unmodified) test file you created

Take a look at examples/*, too.

The expresso-helper modifies the expresso-source code on the fly (not permanent). This can lead to bugs in future versions of expresso (will say: please report bugs as soon as possible *g*).

Current Tags

  • 0.2.4                                ...           latest (8 years ago)

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