我如何在 Angular 2 中测试此功能

Question

moveColumns(shifter: number, index: number) {
    const columnFields = this.form.get('sizes') as FormArray;
 
    let newIndex = index + shifter;
    if (newIndex === -1) {
      newIndex = columnFields.length - 1;
    } else if (newIndex === columnFields.length) {
      newIndex = 0;
    }
 
    const currentGroup = columnFields.at(index);
    columnFields.removeAt(index);
    columnFields.insert(newIndex, currentGroup);
  }

我的难点在于它们都在函数变量内部，而不是组件全局变量。

Answer 1

您需要存根表单对象，然后验证函数中发生的更改

// in your test beforeEach
mockComponent.form = new FormArray({sizes: new FormControl());

// And in your function, you can update this form object and validate it

it('should test my function', () => {
const modifiedForm = {} // Add the final result after the function executes

expect(mockComponent.form).toEquals(modifiedForm);
})

我如何在 Angular 2 中测试此功能

How can i test this function in Angular 2

angular

unit-testing

jasmine

karma-jasmine