Wrong type of error when testing javascript function -


i trying test following code:

  /** abstract method placeholder */ myresult.prototype.get = thrownotimplementederror;  function thrownotimplementederror(resultid) {     throw new notimplementederror('please implement in item groups , items. call abstract'); }

with following test.

it('should have placeholder get', function(){     expect(function(){return myresult.get(123);}).tothrowerror(notimplementederror); });

what ends happenining typeerror thrown instead of custom notimplementederror. type error's message is: "myresult.get not function".

i'm wondering if might have calling variable in prototype 'get' think i've seen examples name javascript classes , use custom method call get. seems work other calls.

do have advice on why doesn't work call?

it's prototype function

so have test get function instance of object this:

it('should have placeholder get', function(){     var resultobj = new myresult(); // create instance of object     expect(function(){return resultobj.get(123);}).tothrowerror(notimplementederror); });

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