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jest.fn and sinon.stub have the same role. Stubs and mocks are still useful for testing the annoying async parts or mocking out methods in a library, but they should be used very sparingly. Our assertion in the test is not on a specific call of function a i.e 1st or 3rd call but on all calls. There is a good article among Sinon documentation which describes the difference well. So, we need to make a little trick: We create a mock object by calling sinon.mock and passing it Using Mocks for Testing in JavaScript with Sinon.js; What are Stubs? It was authored by Christian Johansen on Dec, 2010. Sinon.js quick tip: How to stub/mock complex objects, such as DOM objects Tags: JavaScript Sinon Testing Unit Testing Several of my readers have emailed me, asking about how to deal with more complex stubbing situations when using Sinon.js. Use Stub to represent database objects and use Fake and Spy to mimic the behavior of business interfaces or services like retry, logging, etc. how many times and what arguments it was called with. sinon, JavaScript test spies, stubs and mocks. Try to avoid mocks if the same scenarios can be reproduced with simple stubs and fakes. A Stub is a fake that is provided to the class you are testing to satisfy its requirements, but is otherwise ignored in the unit test. Sinon is a mocking library with wide features. Mocks sometimes make test cases difficult to read and difficult to understand. It was authored by Christian Johansen on Dec, 2010. Expectations implement both the spies and stubs APIs. I believe the methods, as outlined in the documentation, are as follows: spy.yield; stub.yields; stub.callsArg; The main difference between yields and callsArg can be found in sinon's documentation for yields:. To see what mocks look like in Sinon.JS, here is one of the PubSubJS tests again, this time using a method as callback and using mocks … When comparing those packages you notice that expect is the more popular package today ( 31,779 Stars on Github ). The Jest mock is … Resources Best Practices for Spies, Stubs, and Mocks in Sinon.js The rule of thumb is: if you wouldn’t add an assertion for some specific call, don’t mock it. Therefore mocks are often tightly coupled to implementation details, thus making your code harder to refactor. A test stub is a function or object that replaces the actual behavior of a module with a fixed response. A Mock is a fake that is provided to the class you are testing, and will be inspected as part of the unit test to verify functionality. In this case a sinon stub is more appropriate then a mock When to use mocks vs stubs? They both return a mock/stub for a function. and stub/mock required call: sinon.stub(Backend, 'fetchData'); Mocking with Dependency Injection. That just means a function that recalls information about its calls, eg. If a method accepts more than one callback, you need to use callsArg to have the stub invoke other callbacks than the first one. Use a stub instead. The stub can only return the fixed response it was programmed to return. We will want to use mock if we want to test the interaction of our SUT with a collaborator that communicate with the outside world. In general you should have no more than one mock (possibly with several expectations) in a single test. "Mocking" means you are supposed to replace some part of what is going to be tested with mocks or stubs. Fakes can be used either as stubs or mocks. To manually mock the function, the simplest way would be to reassign fetchData to some mock-function, but imported bindings are read-only. Stubs and mocks: Jest.fn vs sinon. 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