spy.calledWithNew(); Returns true if spy/stub was called the new operator. However it is not straight forward . Sinon sandbox makes stubbing much easier. Due to this fact it's not viable to make it accept property descriptors as values, because then we wouldn't be able to know whether the user wants to pass a property descriptor or an simple object to replace that property. Test 2 fails with: AssertionError: returned value is the fakedata from the stub. The log messages show that it has printed the data from the file rather than the fakedata. Sinon.JS used to stub properties and methods in a sandbox. Beware that this is inferred based on the value of the this object and the spy function’s prototype, so it may give false positives if you actively return the right kind of object. Sinon Stub API.returns (obj) - specify that whenever call Stub it will return the Object passed as param.throws - tells Sinon to throw general exception whenever given Stub is called.throws ("type") - tells Sinon to throw a particular type of exception whenever given Stub is called Benchmark.js simplifies micro-benchmark testing on different components and their methods. Sinon will throw a very helpful error if the method you attempt to stub doesn’t exist. I am writing this story to explain why it is not straight forward and what is the possible options or tools we can use to do that. It is best practice to stub the method you expect to use on the same type of object you use in your code. Well, yes. When I inspect the this.sandbox.loader function in the debugger it is correctly set to the stub. sandbox = sinon.createSandbox(); fileStub = sandbox.stub(AwsEksDetector, 'fileAccessAsync' as any).resolves(true); Benchmark.js. Without it, the stub may be left in place and it may cause problems in other tests. This will avoid writing unit tests that pass if the code is using non-existent methods: Mocking Time with sinon.js – The Chronicles of Nerdia, There are situations where new Date() or Date.now is used in to remember how to mock/stub or spy on Date.now / new Date with Jest. I see sandboxing is an option but I do not see how you can use a sandbox for this. Methods and properties are restored after test(s) are run. Test 1 passes. Is that possible? Wrapping a test with sinon.test() allows us to use Sinon’s sandboxing feature, allowing us to create spies, stubs and mocks via this.spy(), this.stub() and this.mock(). Let's say we have this function that updates the database: Sinon helps you create mocks, stubs and spies to help with unit testing. Here's the code we will test. 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