使用笑话在角度中使用.find方法对数组进行单元测试

Question

如何使用.find方法以角度获取数组的覆盖率。我在下面的代码段遇到了麻烦。

sample.component.ts

public permissions = [{id: 0, value: 'fruit' }, {id: 1, value: 'vegetable'}];
this.filteredList = this.permissions.slice();
public isFiltered(permission) {
    return this.filteredList.find(item => item.id === permission.id);
}

sample.spec.ts

it('should call myMethod ', () => {
  expect(component.isFiltered(1)).toEqual(true);
});

我遇到以下错误，TypeError: Cannot read property 'find' of undefined

任何帮助将不胜感激

Answer 1

这样写

it('should call myMethod ', () => {
public permissions = [{id: 0, value: 'fruit' },{id: 1, value: 'vegetable'} ];
component.filteredList = this.permissions.slice();
expect(component.isFiltered(1)).toEqual(true);
 });

您需要给component.filteredList一些值