d3.js - jasmine testing on external library -

i attempting basic testing using jasmine. use external library & intend spy/mock method calls on library object (d3) , make sure appropriate methods called on d3.

        var d3spy = jasmine.createspyobj('d3', ['select']);         spyon(window, 'd3').andreturn(d3spy);         expect(d3spy.select).tohavebeencalled(); 

when 'select' being called on object, error.

typeerror: object function () { spyobj.wascalled = true; spyobj.callcount++; var args = jasmine.util.argstoarray(arguments); spyobj.mostrecentcall.object = this; spyobj.mostrecentcall.args = args; spyobj.argsforcall.push(args); spyobj.calls.push({object: this, args: args}); return spyobj.plan.apply(this, arguments);  } has no method 'select' 

what doing wrong?

the failure in code following

spyon(window, 'd3').andreturn(d3spy); 

this line wil return spy when call d3(). replace d3 object function when called returns {select: jasmine.createspy()}. using d3 never call d3() cause select static member of d3

so solution spy on `d3.select'

spyon(d3, 'select') 

btw. problem libs d3 use heavy chaining is, hard mock. select spy in example has return object fits d3 selections object , on. easier not mock out everything.