calledWith object key/value matching

[Tyler Clemens]

Hello everyone,

I'm trying to use calledWith on a spy to check if it was called with an object, that contained a key with a specific value. Something like the following:

sinon.assert.calledWith(mySpy, { foo: 'bar' });

But mySpy is actually being called with something like this:

mySpy({ foo: 'bar', foo2: 'bar2'})

Is there a way to do "partial" matching on a object that is being passed as a parameter, or do I have to check against the entire object?

Here's a complete example:

var myObj = {

  myFunction: function(params) {

    return params;

  }

}

describe('myObj myFunction', function () {
 
  beforeEach(function () {
    sinon.spy(myObj, 'myFunction');
  });


  afterEach(function () {
    myObj.myFunction.restore();
  });


  it('calls myFunction with a single property', function () {
    sinon.assert.notCalled(myObj.myFunction)
    myObj.myFunction({foo: 'bar'})
    sinon.assert.called(myObj.myFunction)
  });


  it('calls myFunction with two properties', function () {
    myObj.myFunction({foo: 'bar', foo2: 'bar2'})
    sinon.assert.called(myObj.myFunction)
    sinon.assert.calledWith(myObj.myFunction, {foo: 'bar', foo2: 'bar2'}) // works
    sinon.assert.calledWith(myObj.myFunction, {foo: 'bar'}) // fails
  });
});

[Travis Kaufman]

Try using sinon.match http://sinonjs.org/docs/#matchers

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[Tyler Clemens]

Perfect! Thanks, I had a hard time trying to come up with what to call this to google search it.