6. Mocking Tools

Free and Open Source Tools

6.1 MockServer

• Description: Allows mocking of any HTTP or HTTPS system.
• Website: https://www.mock-server.com
• Key features:
• Setting and verifying expectations.
• Can run as a standalone server or embedded.
• Benefits:
• Flexible and powerful.
• Useful in both development and testing.

6.2 Hoverfly

• Description: Lightweight service virtualization and API simulation tool.
• Website: https://hoverfly.io
• Key features:
• Recording and simulating HTTP(S) traffic.
• Supports different simulation modes.
• Benefits:
• Fast and scalable.
• Language-agnostic with multiple deployment options.

6.3 Mountebank

• Description: Open source tool for simulating HTTP, HTTPS, TCP, and other protocols.
• Website: http://www.mbtest.org
• Key features:
• Protocol-agnostic service virtualization.
• Complex stubbing and mocking options.
• Benefits:
• Simplifies testing of distributed systems.
• No need for external dependencies.

6.4 WireMock

• Description: Flexible API mocking tool for simulating HTTP-based APIs.
• Website: http://wiremock.org
• Key features:
• Stubbing, mocking, and proxy functions.
• Can simulate network failures and delays.
• Benefits:
• Easy setup and use.
• Suitable for unit and integration testing.