javascript - Checking variable value with Jasmine -

how can check variable value jasmine? imagine example have function:

function mytestfunction(){    var z = 100; } 

how can test jasmine if value of variable "z" 100?

something like:

describe("test 1", function () {     beforeeach(function () {         setuphtmlfixture();                                          $('#show').trigger("onmouseover");                           });      it("check if value contains 100", function () {         expect($(var z)).toequal("100");                 }); });