如何用操作符&和角11中的取舍来制作if条件的测试用例

Question

我试图为这个测试用例编写测试用例，但npm测试失败了：

这是我在ts文件中的功能：

fromToHours(){
    let from = this.form.controls.workingHoursFrom.value;
    let to = this.form.controls.workingHoursTo.value;
    if((from == "" && to != "") || (from != "" && to == "")){
      return false;
    }
    else{
      return true;
    }
  }

这是我的spec.ts文件，这个测试用例对于npm测试失败了：

it('should test fromToHours()', () => {
    expect(component.fromToHours()).toEqual(true);
    let from = "";
    let to = "";
    component.form.controls['workingHoursTo'].setValue(from);
    component.form.controls['workingHoursTo'].setValue(to);
    from = "17:00";
    to = null;
    expect(component.fromToHours()).toEqual(false);
    from = null;
    to = "17:00";
    expect(component.fromToHours()).toEqual(false);
  });

如何使这个测试用例正确？

Answer 1

如果该测试用例是否有效，以及如果它有任何意义，则搁置一边--您正以错误的方式将值分配给控件。

//bad description of test, you are not testing if test is testing fromToHours method. Could be rather "returns true if no values are provided"

it('should test fromToHours()', () => {
    expect(component.fromToHours()).toEqual(true);
    component.form.controls['workingHoursTo'].setValue("17:00");
    component.form.controls['workingHoursTo'].setValue(null);
    expect(component.fromToHours()).toEqual(false);
    component.form.controls['workingHoursTo'].setValue(null);
    component.form.controls['workingHoursTo'].setValue("17:00");
    expect(component.fromToHours()).toEqual(false);
  });

您不能重新分配变量，并期望在您以前使用过的每个地方，该变量更改都将生效。