如何使用运算符 && 制作 if 条件的测试用例和||角度11

Question

我正在尝试为此编写测试用例，但 npm 测试失败：

这是我在 ts 文件中的函数：

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，该测试用例 npm 测试失败：

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);
  });

如何使此测试用例正确？

Answer 1

抛开该测试用例是否有效，以及它是否有意义 - 您正在以错误的方式为控件分配值

//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之前使用过的每个地方该变量更改都会生效。