Load Testing Using K6

This project is aimed to run load test on BE endpoints. in this project K6 library used to send parallelized HTTP requests to the services and simulate number of users on those requests to recognize bottleneck of the whole project with visual graphs that K6 will generate.

Table of contents:

• Load Testing Using K6
  • Table of contents:
  • Pre-prerequisites
    • .env file
    • Project structure
    • NPM Scripts
    • Build and run the tests
  • How to write load tests
    • step 1 : test directory
    • step 2 : each test case files
    • checks.ts
    • index.ts
    • inputs.ts
    • interfaces.ts
    • operations.ts
    • options.ts
    • requests.ts

Pre-prerequisites

.env file

Read .env.example file for detailed explanation of each required variable and then create a copy, name it .env and set the appropriate values.

Project structure

The folder structure is explained below:

Name	Description
.vscode	Contains VS Code specific settings
node_modules	Contains all npm dependencies
src	Contains source code
src/config	Contains configuration
src/common	Contains all of the common utils function that used on different part of the project.
src/apiv2	Contains all of test cases definitions
.env.example -> .env	API Base URL and env vars passwords
.babelrc	Contains Babel configs
tsconfig.json	Config settings for compiling server code written in TypeScript
.eslintrc.js	Config settings for ESLint code style checking
.eslintignore	Config settings for paths to exclude from linting
.prettierrc	Prettier configuration file
tsconfig.json	Contains typescript configs
webpack.config.js	Contains webpack configs

NPM Scripts

Npm Script	Description
build	build dist dir and transpile ts files into js files
lint	Runs ESLint on project files
lint:fix	Runs ESLint on project files automatically fixing problems

Build and run the tests

• Install k6 brew install k6
• Install packages npm i
• Run npm run build.
• Run test locally Execute k6 run ./dist/src/apiv2/login-authentication.js
• Run to upload results to k6cloud K6_CLOUD_TOKEN=<projectId on k6> k6 cloud ./dist/src/apiv2/login-authentication.js

How to write load tests

step 1 : test directory

Create a directory with the name of service-name on src/service-name.

step 2 : each test case files

Create a directory with the name of test case that you want to add for that service and add these files into that directory src/service-name/directory-name:

Name	Description
checks.ts	Contains checks functions for each step in a load test
index.ts	Contains main structure of load test for load tests that includes all checks, etc.
inputs.ts	Contains all input values that each endpoint needs to make a validate request.
interfaces.ts	Contains all interfaces and types.
operations.ts	Contains any kind of http requests operation that included in the test case.
options.ts	Contains K6 settings for that specific endpoint like number of users, duration of the test, etc.
requests.ts	Contains all functions that using the input and operations to make HTTP request to and endpoint.