MockBukkit
MockBukkit is a Java mocking framework for unit testing Bukkit and PaperMC server plugins. It provides mock implementations of the Bukkit/CraftBukkit server, allowing developers to test plugin code in isolation without a live server.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | MockBukkit/MockBukkit |
| Owner | MockBukkit |
| Primary language | Java |
| License | MIT — OSI-approved |
| Stars | 737 |
| Forks | 154 |
| Open issues | 38 |
| Latest release | Unknown |
| Last updated | 2026-07-02 |
| Source | https://github.com/MockBukkit/MockBukkit |
What MockBukkit is
MockBukkit provides mock implementations of Bukkit server components (plugins, players, worlds) to enable isolated unit testing of PaperMC/Bukkit plugins. It is distributed via Maven Central with version-specific artifacts (e.g., mockbukkit-v26.1.2) that bundle the corresponding Paper API version.
Get the MockBukkit source
Clone the repository and explore it locally.
git clone https://github.com/MockBukkit/MockBukkit.gitcd MockBukkit# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- MockBukkit requires matching Paper API versions; the framework bundles Paper-Version in JAR manifests for automatic or manual resolution in build scripts.
- Tests must use @BeforeEach/@AfterEach to initialize MockBukkit.mock() and load plugins; structure mirrors standard JUnit 5 patterns.
- UnimplementedOperationException is thrown for unmocked Bukkit features; README notes this is a common troubleshooting issue requiring workarounds or mocking extensions.
- Version-specific artifact IDs (mockbukkit-v26.1.2, etc.) mean you select the Paper version at dependency declaration time, not runtime.
When to avoid it — and what to weigh
- Full server integration testing required — If you need to test plugin interaction with real Minecraft client behavior, redstone logic, or actual world generation, a live server environment is necessary.
- Testing non-Bukkit server software — MockBukkit is tightly coupled to Bukkit/PaperMC APIs and cannot be used for other server frameworks or plugins.
- Performance/load benchmarking — MockBukkit is designed for correctness testing, not production-like performance characterization or stress testing.
- Testing undocumented CraftBukkit internals — MockBukkit provides intentional mock implementations; if plugin code relies on private or undocumented CraftBukkit details, mocks may not replicate that behavior.
License & commercial use
MIT License. Permissive OSI-approved license allowing use, modification, and distribution with minimal restrictions (retain copyright/license notice).
MIT is a permissive license generally considered safe for commercial use in proprietary projects. However, review your own legal/compliance requirements. MockBukkit itself is free/open-source; ensure any plugins you develop comply with their own licensing and Bukkit/PaperMC usage terms.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
MockBukkit is a test-only framework and does not handle production secrets or authentication. No sensitive data exposure risk from the library itself. Ensure unit tests do not commit hardcoded plugin configs or server credentials. No known CVEs mentioned in provided data.
Alternatives to consider
PaperMC test server + integration tests
Run a lightweight PaperMC instance locally or in CI; tests real server behavior but slower and higher resource overhead than mocks.
PowerMock / Mockito for manual mocking
Use generic mocking libraries to hand-craft Bukkit mocks; full control but more boilerplate and maintenance burden than MockBukkit.
Containerized integration testing with a real server; comprehensive but slower and operationally complex for unit-test workflows.
Build on MockBukkit with DEV.co software developers
Integrate MockBukkit into your plugin development workflow. Add it to your Maven or Gradle build, write unit tests with confidence, and catch regressions early.
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MockBukkit FAQ
What Java/JUnit version does MockBukkit require?
Can I test plugins for older Bukkit versions (e.g., 1.13)?
What happens when my plugin calls an unmocked Bukkit method?
How do I get the Paper API version that matches my MockBukkit version?
Software development & web development with DEV.co
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Integrate MockBukkit into your plugin development workflow. Add it to your Maven or Gradle build, write unit tests with confidence, and catch regressions early.