Creating test doubles using Sinon allows you to effectively block the execution of the original function

I am currently engaged in JavaScript unit testing using Mocha and Sinon. My goal is to verify if a specific method is called under certain conditions.

However, I have encountered difficulties purely testing the method call. To clarify, I aim to replace the actual method with a fake one to avoid simulating the entire application state just for this simple test.

This snippet displays my current test code:

it('calls the handleResults method when its model syncs', function () {
    var spy = sinon.stub( this.appview, 'handleResults' ); 
    this.appview.model.fetch();
    server.requests[0].respond( 200,
                   { "Content-Type": "application/json" },
                   JSON.stringify( [ { id: "casa", text: "Something" } ] )
    );
    spy.should.have.been.called;
});

The actual this.appview.handleResults method is executed, but what I desire is to invoke a fake version solely responsible for verifying the method call without any additional actions.

What could be the issue here?

Answer №1

The instructions clearly state that utilizing stub will substitute the original function with a mock and will not execute it:

As mimics, stubs can either be nameless or wrap existing functions. When wrapping an existing function with a stub, the initial function is not invoked.

Furthermore,

var stub = sinon.stub(object, "method");

This action replaces object.method with a stubbed function. The initial function can be reinstated by executing object.method.restore(); (or stub.restore();). An error is raised if the property is not already a function, to prevent mistakes when mocking methods.

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