Insert(SpyOn 2 times) jQuery value to input during Jasmine tests

问题

Hi i have a works tests

it("should add a model", function() {

    spyOn($.fn, "val").and.returnValue("Bar");

    foodtype.addNewFoodtype(); //My view 
    expect($("#newFoodtype").val()).toEqual("Bar");
    expect(foodtype.collection.length).toEqual(1);

});

on next test when I set

spyOn($.fn, "val").and.returnValue("Bar");
$("#newFoodtype").val()
spyOn($.fn, "val").and.returnValue("Foo");
$("#newFoodtype").val()

to checking a change but have a error

Error: spyOn : val has already been spied upon Usage: spyOn(object, methodName)

回答1:

You'll just need to return a new value instead of spying on it again.
Here is how I modified your code to make it work.
assigned a variable to spy so that I can access it once again spyObj.and.returnValue("Foo");

Please note that I've used a dummy view foodtype which mimics your view.

var foodtype = {
  addNewFoodtype: function() {
    $("#newFoodtype").val("some val");
    this.collection.push("some val");
  },
  collection: []
}
describe("multispy demo", function() {
  it("should add a model", function() {
    var spyObj = spyOn($.fn, "val").and.returnValue("Bar");
    foodtype.addNewFoodtype(); //My view 
    expect($("#newFoodtype").val()).toEqual("Bar");
    expect(foodtype.collection.length).toEqual(1);
    spyObj.and.returnValue("Foo");
    expect($("#newFoodtype").val()).toEqual("Foo");
  });

});

来源：https://stackoverflow.com/questions/42084022/insertspyon-2-times-jquery-value-to-input-during-jasmine-tests

标签

jquery

jasmine