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Versão: 29.5

Using with DynamoDB

With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with DynamoDB.

Use jest-dynamodb Preset​

Jest DynamoDB provides all required configuration to run your tests using DynamoDB.

  1. First, install @shelf/jest-dynamodb
npm install --save-dev @shelf/jest-dynamodb
  1. Specify preset in your Jest configuration:
{
  "preset": "@shelf/jest-dynamodb"
}
  1. Create jest-dynamodb-config.js and define DynamoDB tables

Veja API Criar Tabela

module.exports = {
  tables: [
    {
      TableName: `files`,
      KeySchema: [{AttributeName: 'id', KeyType: 'HASH'}],
      AttributeDefinitions: [{AttributeName: 'id', AttributeType: 'S'}],
      ProvisionedThroughput: {ReadCapacityUnits: 1, WriteCapacityUnits: 1},
    },
    // etc
  ],
};
  1. 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);
  1. Escreva os testes
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',
  });
});

There's no need to load any dependencies.

Acesse a documentação para mais detalhes.