Circuit Breaker Testing Library 5.1

Circuit Breaker Testing Library is a lightweight, framework-agnostic toolkit for validating the behavior of circuit breaker policies in services and applications. It helps teams confidently verify state transitions, fallback logic, and recovery scenarios before changes reach production, reducing the risk of cascading failures and improving system resilience.

Key capabilities:

• Drive and assert circuit breaker state transitions (closed, open, half-open) under controlled conditions.
• Simulate downstream failures, timeouts, latency spikes, and error-rate thresholds.
• Inspect emitted metrics and events to confirm thresholds, windows, and cool-downs are applied as expected.
• Provide deterministic testing via controllable clocks and scripted failure sequences.
• Support both synchronous and asynchronous code paths and common unit/integration testing workflows.
• Offer helpers and assertions to validate fallback execution, short-circuiting, and recovery behavior.

Typical uses:

• Regression testing of resilience policies across microservices.
• Verifying breaker configurations (thresholds, durations, sliding windows) during CI.
• Ensuring consistent behavior across different circuit breaker implementations.

Use it alongside your preferred circuit breaker library to create clear, repeatable tests that prove your resilience strategies work as designed.

Circuit Breaker Testing Library is developed by OMICRON electronics. The most popular versions of this product among our users are: 4.5, 4.7, 4.8, 5.0 and 5.1. The name of the program executable file is updaterCBTL_1033.exe.