comparison-to-ibrik.md

coffee-coverage vs. ibrik

Instrumentation

Here's a code snippet:

myFunc = (x=7) ->
    return x + 1

myFunc(6)
myFunc(7)

Here's the output from ibrik cover ./src/coverageTest.coffee:

Statements   : 87.5% ( 7/8 )
Branches     : 50% ( 1/2 )
Functions    : 100% ( 2/2 )
Lines        : 100% ( 4/4 )

First, note ibrik finds eight statements, two branches, and two functions in the above code. This is because ibrik is instrumenting the compiled JavaScript. The extra function comes from the fact that the JavaScript version has a (function(){...}).call(this); wrapper around the entire block. The "branch" comes from the default parameter, which will compile to an extra statement if (x == null) { x = 7; }.

Here's the output from coffee-coverage:

Statements   : 100% ( 4/4 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 1/1 )
Lines        : 100% ( 4/4 )

This is probably a lot more in line with what you were expecting from this code.