- stub-properties-and-methods-sinon.js 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. Test 2 fails with: AssertionError: returned value is the fakedata from the stub. 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. sandbox = sinon.createSandbox(); fileStub = sandbox.stub(AwsEksDetector, 'fileAccessAsync' as any).resolves(true); Benchmark.js. When I inspect the this.sandbox.loader function in the debugger it is correctly set to the stub. There should not be any issues with using Sinon v9.2.2 in newer versions of the same runtimes. Let's say we have this function that updates the database: Checking the Order of Function Calls or Values Being Set. Benchmark.js simplifies micro-benchmark testing on different components and their methods. Well, yes. 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. Sinon will throw a very helpful error if the method you attempt to stub doesn’t exist. 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. 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(). However it is not straight forward . The log messages show that it has printed the data from the file rather than the fakedata. If you need to check that certain functions are called in order, you can use spies or stubs together with sinon.assert.callOrder: Sinon helps you create mocks, stubs and spies to help with unit testing. Sinon sandbox makes stubbing much easier. It is best practice to stub the method you expect to use on the same type of object you use in your code. spy.calledWithNew(); Returns true if spy/stub was called the new operator. 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: 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 Here's the code we will test. This behaves the same as spy.alwaysCalledWith(sinon.match(arg1), sinon.match(arg2), ...). Methods and properties are restored after test(s) are run. 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