rewireify

Rewireify is a port of Rewire for Browserify that adds setter and getter methods to each module so that their behaviour can be modified for better unit testing.

Rewireify

Rewireify is a port of Rewire for Browserify that adds setter and getter methods to each module so that their behaviour can be modified for better unit testing. With Rewireify you can:

  • Inject mocks for other modules
  • Leak private variables
  • Override variables within the module

First install and save Rewireify into your project dependencies:

$ npm install rewireify --save-dev

Include the Rewireify transform as part of your Browserify test build:

$ browserify -e app.js -o test-bundle.js -t rewireify -s test-bundle

Rewireify can also ignore certain files with the --ignore option and a filename. Multiple files can be excluded by separating them with commas:

$ browserify -e app.js -o test-bundle.js -t [ rewireify --ignore filename,second-filename ] -s test-bundle

Now you can inspect, modify and override your modules internals in your tests:

var bundle = require("./path/to/test-bundle");
 
// Private variables can be leaked... 
subject.__get__("secretKey");
 
// ...or modified 
subject.__set__("secretKey", 1234);
 
// Multiple, nested properties can be changed 
subject.__set__({
  "user.firstname": "Joe",
  "user.lastname": "Bloggs"
});
 
// Dependencies can be mocked... 
subject.__set__("config", {
  cache: false,
  https: false
});
 
// ...or methods stubbed 
subject.__set__("http.get", function(urlcb) {
  cb("This method has been stubbed");
});
  • name

    Name of the variable to get. The variable should be defined with var in the top-level scope of the module.

  • name

    Name of the variable to set. The variable should be defined with var in the top-level scope of the module.

  • value

    The value to set.

  • map

    Takes all keys as variable names and sets their values respectively.