WireMock
WireMock is an open source tool for simulating HTTP-based APIs during development. It enables mocking and stubbing of APIs and servers before they are fully developed to enable faster testing of applications that integrate with them.
mocking
stubbing
http
testing
WireMock: Open Source API Mocking Tool
WireMock is an open source tool for simulating HTTP-based APIs during development, enabling faster testing of applications that integrate with them.
What is WireMock?
WireMock is an open source API mocking and stubbing tool for testing HTTP-based APIs and microservices. It allows developers to simulate the APIs their code needs to interact with before those APIs are fully developed, enabling faster testing and development.
Some key features of WireMock include:
- The ability to quickly define stubbed HTTP responses that stand in for not-yet-implemented APIs. These can return JSON, XML, headers, status codes, etc.
- Matching incoming requests against flexible request patterns, similar to assertions in mocking frameworks.
- Simulating fault conditions like network issues, slow responses, or unexpected payloads.
- Recording actual requests/responses between your code and external services during integration testing. These recordings create stubs mapping requests to responses to replay later for virtualized integration testing.
- Extensive support and configuration options for simulating complex APIs.
- A standalone server that your code under test can connect to as a mock external system.
By using WireMock early in development, teams can test against simulated responses from services that haven’t actually been built yet. This facilitates test-driven development, faster feedback cycles, and improved collaboration across API owners and consumers.
WireMock Features
Features
- HTTP request stubbing
- Request matching and response templating
- Record and playback of stub mappings
- Proxying
- HTTPS support
- Customizable request matching
- Customizable response generation
- Self-contained executable JAR with embedded web server
Pricing
- Open Source
Pros
Enables testing against simulated APIs without needing real endpoints
Faster and more flexible than mocking HTTP interactions in unit tests
Avoids flakiness when testing against remote endpoints
Simplifies testing of edge cases and failure modes
Enables working offline
Cons
Additional component to install and run during testing
Can make tests more brittle if stubs drift from actual API behavior
Stubbing complex APIs can require significant upfront effort
Official Links
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