酶模拟变化不适用于 Formik

Question

我正在尝试使用 Enzyme 和 Jest 测试我的应用 Formik 输入之一，

describe("<VehicleForm />", () => {
  it("renders correctly", async () => {
    const wrapper = shallow(<VehicleFormIcon />);
    const nameInput = wrapper.find(Formik).dive().find("[name='inputName']");
    nameInput.simulate("change", {
      // you must add this next line as (Formik calls e.persist() internally)
      persist: () => {},
      // simulate changing e.target.name and e.target.value
      target: {
        name: "inputName",
        value: "ian",
      },
    });
    await expect(nameInput.props().value).toEqual("ian");
  });

运行 npm 测试时我得到

expect(received).toEqual(expected) // deep equality
    Expected: "ian"
    Received: "" 

如果我做 console.log(nameInput.props()) 我收到，

{
 name: 'inputName',
      style: { marginHorizontal: 20, marginBottom: 15 },
      value: '',
      status: 'basic',
      label: 'Nombre cliente',
      autoCapitalize: 'words',
      placeholder: 'Ingrese el nombre del cliente',
      onBlur: [Function: onBlur],
      onChangeText: [Function (anonymous)],
      returnKeyType: 'next',
      onSubmitEditing: [Function: onSubmitEditing],
      blurOnSubmit: false,
      caption: [Function: caption]
    }

所以至少包装器包含我要模拟的输入。 为什么模拟 function 不改变输入的值？