Examples for mocking in Node with Rewire Library

RewireMockLibraryExamples.js

// [Mock a class]
// (when calling myFile.myMethod(), ClassIWantToMockInMyFie will be replaced by MyMockClass)
const myFile = rewire("../src/myFile");

myFile.__set__( {
        'ClassIWantToMockInMyFie': MyMockClass
} );



// [Mock a method]
// (when calling myFile.myMethod() or myFile.myOtherMethod(), myMethod behavior will be replaced with the defined return value)
const myFile = rewire("../src/myFile");

myFile.__set__('myMethod', () => 'theValueThatTheMethodShouldReturn');



// [Mock a method of a dependency]
// Example: mocking bcrypto hashSync and genSaltSync
const utilsFile = rewire("../src/others/utils");

utilsFile.__set__('bcrypt.genSaltSync', () => '123');

utilsFile.__set__('bcrypt.hashSync', () => '123');

assert.strictEqual( utilsFile.getBcryptOf("a") , '123');