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2026-07-29 16:01
REST API

Circuit Breaker

RetryErrorValidateExpert
Try Interactive Demo

What you will learn

  • Verify the open → half-open → closed transitions and their threshold triggers
  • Assert fast-fail when circuit is open — slow fallbacks cascade under load
  • Test that a single successful probe doesn't prematurely close a still-broken circuit

Description

Test circuit breaker states: closed, open, half-open.

Test Scenario

// Trip the breaker: POST action 'failure' until the threshold (5) is reached
for (let i = 0; i < 5; i++) {
  await request.post('/api/v1/circuit-breaker', { data: { action: 'failure' } });
}

// Read status — state lives under .stats and is upper-case
const response = await request.get('/api/v1/circuit-breaker');
const body = await response.json();
expect(body.stats.state).toBe('OPEN');
Endpoint/api/v1/circuit-breaker

Testing Tips

  • •Multiple failures open the circuit
  • •Open circuit returns fast failure
  • •Half-open allows test requests
// Playwright API Testing - REST
import { test, expect } from '@playwright/test';


test('REST API request', async ({ request }) => {
  const response = await request.get('/api/v1/resource');


  expect(response.ok()).toBeTruthy();
  expect(response.status()).toBe(200);


  const data = await response.json();
  expect(data).toBeDefined();
});

Challenge ID: rest-circuit-breaker

2 frameworks available

API Playground

Send requests and inspect responses

Endpoint: /api/v1/circuit-breaker

Press Enter to send