E-commerce load testing

<?php
require __DIR__ . '/vendor/autoload.php';

use VoltTest\DataSourceConfiguration;
use VoltTest\VoltTest;

$test = new VoltTest('Flash sale rehearsal');

// the shape of the sale: warm up, drop, hold, drain
$test->stage('2m', 200)   // ramp 0 -> 200
     ->stage('30s', 3000)  // the drop: 200 -> 3000
     ->stage('5m', 3000)   // same target = hold at 3000
     ->stage('2m', 0);    // drain

// 30% of shoppers actually buy
$buyers = $test->scenario('Browse and buy');
$buyers->setWeight(30)->autoHandleCookies();
$buyers->setDataSourceConfiguration(
    new DataSourceConfiguration(__DIR__ . '/shoppers.csv', 'unique', true)
);

$buyers->step('Sign in')
    ->post('https://shop.example.com/api/v1/login',
        '{"email":"${email}","password":"${password}"}')
    ->header('Content-Type', 'application/json')
    ->validateStatus('signed in', 200)
    ->extractFromJson('token', '$.data.access_token')
    ->setThinkTime('3s');

$buyers->step('Browse catalogue')
    ->get('https://shop.example.com/api/v1/products')
    ->header('Authorization', 'Bearer ${token}')
    ->validateStatus('catalogue ok', 200)
    ->extractFromJson('sku', '$.data[0].id')
    ->setThinkTime('5s');

$buyers->step('Add to cart')
    ->post('https://shop.example.com/api/v1/cart/add',
        '{"product_id":"${sku}","quantity":1}')
    ->header('Authorization', 'Bearer ${token}')
    ->header('Content-Type', 'application/json')
    ->validateStatus('added to cart', 200)
    ->setThinkTime('8s');

// sandbox payment only — never a live gateway
$buyers->step('Checkout')
    ->post('https://shop.example.com/api/v1/orders/checkout',
        '{"payment_method":"sandbox_card"}')
    ->header('Authorization', 'Bearer ${token}')
    ->header('Content-Type', 'application/json')
    ->validateStatus('order placed', 201);

// the other 70% just look
$browsers = $test->scenario('Browse only');
$browsers->setWeight(70);
$browsers->step('Browse catalogue')
    ->get('https://shop.example.com/api/v1/products')
    ->validateStatus('catalogue ok', 200)
    ->setThinkTime('5s');

$result = $test->run(true);