mock-all

NodeJS simple mocking

Example:

mySuperModule.js:

var myAnotherModule = require('myAnotherModule');
var logger = require(__dirname + "/../config/logging");

exports.func = function func(arg) {
  logger.log(myAnotherModule.foo());
  return new Buffer(arg + myAnotherModule.foo() + arg);
}

test_mySuperModule.js:

var mock = require("mock-all");
var fsMock = {
  readFileSync: function() {
    return "";
  }
};

myAnotherModuleMock = {
  foo: function () {
    return "bar";
  }
}
var mocks = {
  fs: fsMock,
  myAnotherModule: myAnotherModuleMock,
  "/../config/logging": console
};
var globals = {
  // can override global __dirname in mySuperModule.js
  __dirname: __dirname,
  Buffer: Buffer
};

var mockedModule = mock("#{__dirname}/../build/mySuperModule.js", mocks, globals);
var buf = mockedModule.func("str");
assert.ok(buffer.isBuffer(buf), "Test failed!");

You can mock any variable after create mocked module:

mockedModule.__setMock__("fs", {writeFile: function(f, d, cb) {cb(null)}});

And restore mocked variable with setMock:

mockedModule.__restoreAll__();