[英]How to cover a ManyToOne decorator with Jest?
I have an entity with a @ManyToOne decorator on it.我有一个带有 @ManyToOne 装饰器的实体。 The problem is that my Jest unit test is not covering that single line, even though it cover others decorators.
问题是我的 Jest 单元测试没有覆盖那一行,即使它覆盖了其他装饰器。
The entity (Simplified):实体(简体):
@Entity({ name: 'user' })
export default class User {
@PrimaryGeneratedColumn('uuid')
public id: string;
@Column({ name: 'username' })
@IsNotEmpty()
@MinLength(3)
@MaxLength(30)
public username: string;
@ManyToOne(() => Account)
@IsNotEmpty()
@JoinColumn({ name: 'account_id', referencedColumnName: 'id' })
public account: Account;
The typeorm
is also mocked in a __mocks__
folder, exporting the properties used, including: typeorm
也在__mocks__
文件夹中__mocks__
,导出使用的属性,包括:
export const ManyToOne = jest.fn();
How should I write my test with jest so it covers the ManyToOne decorator?我应该如何开玩笑地编写我的测试,以便它涵盖 ManyToOne 装饰器?
My guess is that the non-covered line is not the entire line with the decorator, but only the body of the callback.我的猜测是未覆盖的行不是带有装饰器的整行,而只是回调的主体。
Since you have mocked const ManyToOne = jest.fn();
因为你已经嘲笑了
const ManyToOne = jest.fn();
your decorator is a function that does not have implementation and does not invokes any passed callback.您的装饰器是一个没有实现且不调用任何传递的回调的函数。
So if you mock it as a function which immediately executes and returns the result of the given callback因此,如果您将其模拟为一个立即执行并返回给定回调结果的函数
export const ManyToOne = jest.fn(callback => callback());
you should be able to achieve 100% coverage of that line您应该能够实现该线路的 100% 覆盖率
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