与 DynamoDB 一起使用
借助 全局设置/拆卸 和 异步测试环境 API,Jest 可以与 动态数据库 顺利工作。
¥With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with DynamoDB.
使用 jest-dynamodb 预设
¥Use jest-dynamodb Preset
Jest DynamoDB 提供使用 DynamoDB 运行测试所需的所有配置。
¥Jest DynamoDB provides all required configuration to run your tests using DynamoDB.
-
首先,安装
@shelf/jest-dynamodb
¥First, install
@shelf/jest-dynamodb
- npm
- Yarn
- pnpm
npm install --save-dev @shelf/jest-dynamodb
yarn add --dev @shelf/jest-dynamodb
pnpm add --save-dev @shelf/jest-dynamodb
-
在 Jest 配置中指定预设:
¥Specify preset in your Jest configuration:
{
"preset": "@shelf/jest-dynamodb"
}
-
创建
jest-dynamodb-config.js
并定义 DynamoDB 表¥Create
jest-dynamodb-config.js
and define DynamoDB tables
见 创建表 API
¥See Create Table API
module.exports = {
tables: [
{
TableName: `files`,
KeySchema: [{AttributeName: 'id', KeyType: 'HASH'}],
AttributeDefinitions: [{AttributeName: 'id', AttributeType: 'S'}],
ProvisionedThroughput: {ReadCapacityUnits: 1, WriteCapacityUnits: 1},
},
// etc
],
};
-
配置 DynamoDB 客户端
¥Configure DynamoDB client
const {DocumentClient} = require('aws-sdk/clients/dynamodb');
const isTest = process.env.JEST_WORKER_ID;
const config = {
convertEmptyValues: true,
...(isTest && {
endpoint: 'localhost:8000',
sslEnabled: false,
region: 'local-env',
}),
};
const ddb = new DocumentClient(config);
-
编写测试
¥Write tests
it('should insert item into table', async () => {
await ddb
.put({TableName: 'files', Item: {id: '1', hello: 'world'}})
.promise();
const {Item} = await ddb.get({TableName: 'files', Key: {id: '1'}}).promise();
expect(Item).toEqual({
id: '1',
hello: 'world',
});
});
无需加载任何依赖。
¥There's no need to load any dependencies.
详情请参见 文档。
¥See documentation for details.