Question

173

Possible to stub method twice within a single test to return different results?

rated 0 times [ 179] [ 6] / answers: 1 / hits: 30309 / 7 Years ago, thu, february 23, 2017, 12:00:00

I would like to re-stub someHandler.getStatus, but I'm getting TypeError: Attempted to wrap getStatus which is already wrapped ..

it('is a test', function() {



  sandbox.stub(someHandler, 'getStatus', function(callback) {

    callback(null, {

      value: 1

    });

  });



  sandbox.stub(someOtherHandler, 'doSomething', function(callback) {

    callback(null);

  });



  sandbox.stub(someHandler, 'getStatus', function(callback) {

    callback(null, {

      value: 0

    });

  });

});

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answered 7 Years ago shelbiec · Accepted Answer

Sinon has a nice API for handling multiple calls (stub.onCall(n);) to the same stubbed method.

Example from stub api doc:

"test should stub method differently on consecutive calls": function () {

    var callback = sinon.stub();

    callback.onCall(0).returns(1);

    callback.onCall(1).returns(2);

    callback.returns(3);



    callback(); // Returns 1

    callback(); // Returns 2

    callback(); // All following calls return 3

}

You can also use onFirstCall() , onSecondCall(), and onThirdCall().

We are using this approach extensively in our tests.