Serverless Jest Plugin

A Serverless Plugin for the Serverless Framework v3+ which adds support for test-driven development using jest

THIS PLUGIN REQUIRES SERVERLESS v3.0 OR LATER!

This package is forked from @nordcloud/serverless-jest-plugin which was abandoned and broke with Serverless v3

Introduction

This plugins does the following:

It provides commands to create and run tests manually
It provides a command to create a function, which automatically also creates a test

Installation

In your service root, run:

npm install --save-dev serverless-jest-plugin-v3

Add the plugin to serverless.yml:

plugins:
  - serverless-jest-plugin-v3
custom:
  jest:
    # You can pass jest options here
    # See details here: https://facebook.github.io/jest/docs/configuration.html
    # For instance, uncomment next line to enable code coverage
    # collectCoverage: true

Usage

Creating functions

Functions (and associated tests) can be created using the command

sls create function -f functionName --handler handler

e.g.

sls create function -f myFunction --handler functions/myFunction/index.handler

creates a new function myFunction into serverless.yml with a code template for the handler in functions/myFunction/index.js and a Javascript function module.exports.handler as the entrypoint for the Lambda function. A test template is also created into test/myFunction.js. Optionally tests can be created to specific folder using --path or -p switch, e.g.

sls create function -f myFunction --handler functions/myFunction/index.handler --path tests

To create tests next to handler use --path {function}, in following example test file myFunction.test.js is created to functions/myFunction/ directory.

sls create function -f myFunction --handler functions/myFunction/index.handler --path {function}

Creating tests

Tests can also be added to existing handlers using

sls create test -f functionName

Running tests

Tests can be run directly using Jest or using the "invoke test" command

sls invoke test [--stage stage] [--region region] [-f function]

If no function names are passed to "invoke test", all tests related to handler functions are run.