Without it, the stub may be left in place and it may cause problems in other tests. Well, yes. Is that possible? 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. Let's say we have this function that updates the database: Sinon helps you create mocks, stubs and spies to help with unit testing. Sinon.JS used to stub properties and methods in a sandbox. All we have to do is wrap the component around the declared object and call its methods. I see sandboxing is an option but I do not see how you can use a sandbox for this. If you need to support very old runtimes that have incomplete support for ES5.1 you might get away with using loading es5-shim in your test environment. There should not be any issues with using Sinon v9.2.2 in newer versions of the same runtimes. The sandbox stub method can also be used to stub any kind of property. Checking the Order of Function Calls or Values Being Set. It is best practice to stub the method you expect to use on the same type of object you use in your code. sandbox = sinon.createSandbox(); fileStub = sandbox.stub(AwsEksDetector, 'fileAccessAsync' as any).resolves(true); Benchmark.js. This will avoid writing unit tests that pass if the code is using non-existent methods: Methods and properties are restored after test(s) are run. This behaves the same as spy.alwaysCalledWith(sinon.match(arg1), sinon.match(arg2), ...). However it is not straight forward . 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. The log messages show that it has printed the data from the file rather than the fakedata. When I inspect the this.sandbox.loader function in the debugger it is correctly set to the stub. Sinon sandbox makes stubbing much easier. Test 1 passes. 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. 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(). - stub-properties-and-methods-sinon.js Here's the code we will test. Test 2 fails with: AssertionError: returned value is the fakedata from the stub. If you need to check that certain functions are called in order, you can use spies or stubs together with sinon.assert.callOrder: Benchmark.js simplifies micro-benchmark testing on different components and their methods. 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