vitest-dynamodb-lite is a fast, concurrent-safe DynamoDB mock for testing with vitest.

In this gif, 16 test files run concurrently without manually launching any dynamodb server. Each dynamodb server is launched when each test file is executed.

vitest-dynamodb-lite runs a local dynamodb server for each test case, so it is safe to run tests concurrently. These test cases in this gif perform PUT and GET an item for the same table name and the same key but different dynamodb servers concurrently.

vitest-dynamodb-lite uses dynalite instead of DynamoDB Local to run DynamoDB locally.

This repository was forked from jest-dynalite to use in vitest and added some performance improvements.

• Optionally clear tables between tests
• Isolated tables between test runners
• Ability to specify a config directory
• No java requirement
• Works with only @aws-sdk/client-dynamodb instead of aws-sdk

npm i vitest-dynamodb-lite -D
# or
yarn add vitest-dynamodb-lite -D
# or
pnpm add vitest-dynamodb-lite -D

// vitest.config.ts
import { defineConfig } from "vitest/config";

export default defineConfig({
  test: {
    setupFiles: ["vitest-dynamodb-lite"],
  },
});

In your project root, create a config file with the tables schemas, and an optional basePort to run dynalite on.

You can write the config file in either json, js, or cjs format.

In json:

{
  "tables": [
    {
      "TableName": "table",
      "KeySchema": [{ "AttributeName": "id", "KeyType": "HASH" }],
      "AttributeDefinitions": [{ "AttributeName": "id", "AttributeType": "S" }],
      "ProvisionedThroughput": {
        "ReadCapacityUnits": 1,
        "WriteCapacityUnits": 1
      }
    }
  ],
  "basePort": 8000
}

In js or cjs:

module.exports = {
  // your configures
};

const client = new DynamoDBClient({
  ...yourConfig,
  ...(process.env.MOCK_DYNAMODB_ENDPOINT && {
    endpoint: process.env.MOCK_DYNAMODB_ENDPOINT,
    region: "local",
  }),
});

process.env.MOCK_DYNAMODB_ENDPOINT is unique to each test runner.

After all your tests, make sure you destroy your client. You can even do this by adding an afterAll in a setupFilesAfterEnv file.

afterAll(() => {
  client.destroy();
});

You can set some fixture data before each test:

vitest-dynamodb-lite-config.json:

module.exports = {
  tables: [
    {
      // ...
      data: [{ id: "a", someattribute: "hello world" }],
    },
  ],
};

MIT