Private method Unit testing with Jasmine

Question

I was coding test cases for an angular application using jasmine. But many internal methods are declared as private in the services.

Example:

App.service('productDisplay', function(){     var myPrivate = function(){         //do sth     }     this.doOfferCal = function(product, date){         //call myPrivate         //do sth too         return offer;     } }); 

Using jasmine it straightforward to code test for "doOfferCal" but I want to write unit test for myPrivate too.

How can I do it?

Thanks in advance.

Answer 1

Thanks jabko87.

In addition, if you want to pass the the arguments use the below example:

const myPrivateSpy = spyOn<any>(service, 'transformNative').and.callThrough();  myPrivateSpy.call(service, {name: 'PR'}); 

Note: Here service is the Class, transformNative is the private method and {name: 'PR'} passing an object argument

Answer 2

Is there a specific reason you wish to test your private methods?

By testing doOfferCal(), you're implicitly testing that myPrivate() is doing the right thing.

Though this is for RailsConf, Sandi Metz has a very good talk on what should be tested.