Question

183

Using Jasmine to spy on variables in a function

rated 0 times [ 185] [ 2] / answers: 1 / hits: 31035 / 12 Years ago, thu, march 8, 2012, 12:00:00

Suppose I have a function as follows

function fun1(a) {

  var local_a = a;

  local_a += 5;

  return local_a/2;

}

Is there a way to test for the value of local_a being what it should be (for example in the first line of code)? I'm a bit new to Jasmine, so am stuck. Thanks in advance.

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jarvisjovannia

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3 Years ago

answered 12 Years ago kieraelsies · Accepted Answer

Not really. You can do the following though:

Test the result of fun1():

expect(fun1(5)).toEqual(5);

Make sure it's actually called (useful if it happens through events) and also test the result:

var spy = jasmine.createSpy(window, 'fun1').andCallThrough();

fire_event_calling_fun1();

expect(spy).toHaveBeenCalled();

expect(some_condition);

Really reproduce the whole function inspecting intermediate results:

var spy = jasmine.createSpy(window, 'fun1').andCallFake(function (a) {

  var local_a = a;

  expect(local_a).toEqual(a);

  local_a += 5;

  expect(local_a).toEqual(a+5);

  return local_a/2;

});

fun1(42);

expect(spy).toHaveBeenCalled();