Question

我想创建一个测试以确保如果我错过必填字段，服务会引发错误。

这是我的模式：

export const UserSchema = new Schema({
    firstName: String,
    lastName: String,
    email: { type: String, required: true },
    passwordHash: String
});

这是我的服务：

@Injectable()
export class UsersService {
    constructor(@InjectModel('User') private readonly userModel: Model<User>) {}

    async create(createUserDto): Promise<User> {
        const createdUser = new this.userModel(createUserDto);
        return await createdUser.save();
    }
}

在我的服务测试中，我遇到了这种情况：

it('Validates required email', async () => {
        const dto = {
            firstName: 'Test',
            lastName: 'User',
            passwordHash: '123ABC'
        };

        expect( async () => {
            return await service.create(dto);
        }).toThrowError(/required/);

    });

但是测试失败，并显示以下消息：

    Expected the function to throw an error matching:
      /required/
    But it didn't throw anything.

有人可以帮助我吗？

Answer 1

我认为您应该像这样修改测试用例：

it('Validates required email', async () => {
        const dto = {
            firstName: 'Test',
            lastName: 'User',
            passwordHash: '123ABC'
        };

        await expect(service.create(dto)).rejects.toThrowError(ValidationError); //probably will be error of this type

    });

Answer 2

我自己回答。诀窍是使用Expect.assertions并尝试catch：

expect.assertions(1);
try {
    await service.create(dto);
} catch (error) {
    expect(error.message).toMatch(/required/);
}

用Jest Expect.toThrow测试猫鼬验证

2 个答案: