Exploring Jasmine's callThrough and callFake capabilities

One of the methods in my codebase returns function references based on different cases.

function methodToBeMocked(param){
  case 1: return func1;
  case 2: return func2;
 .
 .
 case n: return funcN;
}

Now, I need to spy on this method and provide a fake function reference for a specific input parameter p.

Is there a conditional call-through feature available in Jasmine tests? Here's my scenario:

SpyOn(someObject, 'someMethod').and.{if param = p callFake(fakeMethod) else callThrough()}

I initially tried using callFake. Is there a way to hand over control to the original method from the fake method?

javascriptjasminekarma-jasmine

Answer №1

In Jasmine testing, a spy stores the original function in a property called originalValue, allowing you to utilize it like this:

var mySpy = {};
mySpy = t.spyOn(obj, 'methodToBeMocked').and.callFake(function (param) {
    if (param === 'fake input') {
        // provide fake output
    } else {
        // execute this for Jasmine
        return (mySpy.and.callThrough())(param);
        // execute this for Ext + Siesta and confused by similar syntax :)
        // return mySpy.originalValue(param);
    }
});

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