How to ignore lines for code coverage in Jest

Question

In Jest, is there any way to ignore code for test coverage? I tried using

/* istanbul ignore next */ 

But it doesn't seem to work.

Answer 1

It works.

(function(global) {     var defineAsGlobal = true;     /* istanbul ignore next */     if(typeof exports === 'object') {         module.exports = lib;         defineAsGlobal = false;     }     /* istanbul ignore next */     if(typeof modules === 'object' && typeof modules.define === 'function') {         modules.define('lib', function(provide) {             provide(lib);         });         defineAsGlobal = false;     }     /* istanbul ignore next */     if(typeof define === 'function') {         define(function(require, exports, module) {             module.exports = lib;         });         defineAsGlobal = false;     }     /* istanbul ignore next */     defineAsGlobal && (global.lib = lib); })(this); 

Sample project https://github.com/ilyar/sandbox/tree/master/jest

Answer 2

Update for anyone that finds this at a later date.

/* istanbul ignore next */  

Will work but as read from The Jest Official Documentation:

coveragePathIgnorePatterns seems to not have any effect.

Make sure you are not using the babel-plugin-istanbul plugin. Jest wraps Istanbul, and therefore also tells Istanbul what files to instrument with coverage collection. When using babel-plugin-istanbul, every file that is processed by Babel will have coverage collection code, hence it is not being ignored by coveragePathIgnorePatterns.

The documentation can be found here: Documentation

So in order to fix this issue uninstall babel-plugin-istanbul:

If it is a library based only on javascript, than you can just run npm uninstall --save babel-plugin-istanbul or npm uninstall --save-dev babel-plugin-istanbul If you've installed a library with native content that requires linking, and you've linked it with rnpm then you can do: rnpm unlink package_name then follow step 1 - Aakash Sigdel

This quote was from Aakash Sigdel found here: quote