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javascriptsinon

mock method calling callback function sinon

How do you mock an outer method calling a callback using sinon? Example given the following code, getText should return 'a string' as response in the callback function

sinon.stub(a, 'getText').returns('a string')
let cb = function(err, response) {
   console.log(response)
}
a.getText('abc', cb)

and it should produce the output 'a string' since it calls callback function cb but there is no output

Solution

  • You can use callsArgWith

    sinon.stub(a, 'getText').callsArgWith(1, null, 'a string')
let cb = function(err, response) {
   console.log(response); // 'a string'
}

a.getText('abc', cb)