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Invalid Chai property when calling calledOnce...

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Fake return value of function call, each call with different data...

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Sinon fakeServer failed to mock POST: 'TypeError: By RFC7230, section 3.2.4, header values shoul...

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using sinon.spy when two methods have the same name but different arguments...

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Stub environment variables using Sinon in Mocha unit tests for Express routes...

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In Sinon, could not succeed stub/mock a method return...

Sinon.stub.resolves returns undefined when awaited within Buffer.from...

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Mock Lambda.invoke wrapped but not being called...

Sinon not working for exported function...

sinonjs : sinon stub not working on exported function...

Testing promise chains vs async await [mocha/chai/sinon]...

AssertionError [ERR_ASSERTION]: Missing expected rejection (Error)...

How to mock a constructor call in a node.js unit test?...