Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add jabrena/plinth --skill 321-frameworks-spring-boot-testing-unit-testsgit clone --depth 1 https://github.com/jabrena/plinthWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jabrena/plinth/321-frameworks-spring-boot-testing-unit-tests)<a href="https://agentmods.dev/skills/jabrena/plinth/321-frameworks-spring-boot-testing-unit-tests"><img src="https://agentmods.dev/badge/skills/jabrena/plinth/321-frameworks-spring-boot-testing-unit-tests.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00176 | $0.00821 |
| Opus 5 | $0.00088 | $0.00411 |
| Sonnet 5 | $0.00035 | $0.00164 |
| Haiku 4.5 | $0.00018 | $0.00082 |
Grade A, and why
321-frameworks-spring-boot-testing-unit-tests scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Spring Boot Unit Testing with Mockito
Apply Spring Boot unit testing guidelines with Mockito.
What is covered in this Skill?
- Pure unit tests: @ExtendWith(MockitoExtension.class), @Mock, @InjectMocks for @Service/@Component (no Spring context)
- Slice tests: @WebMvcTest, @MockitoBean for controllers (Spring Boot 4.0.x — @MockBean removed)
- @JsonTest for JSON serialization with correct JSON value assertions (extractingJsonPathStringValue, etc.)
- Parameterized tests: @ParameterizedTest with @CsvSource or @MethodSource over copy-pasted methods
- Java records for domain objects in tests
- @TestConfiguration, @ActiveProfiles, @Primary fixed-clock beans for deterministic test setup
- Modern mocking API: @MockitoBean / @MockitoSpyBean; @MockBean/@SpyBean are deprecated/removed in Boot 4.0.x
Scope: Apply recommendations based on the reference rules and good/bad code examples. For integration tests use @322-frameworks-spring-boot-testing-integration-tests.
Constraints
Before applying any test changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.
- MANDATORY: Run
./mvnw compileormvn compilebefore applying any change - SAFETY: If compilation fails, stop immediately
- VERIFY: Run
./mvnw clean verifyormvn clean verifyafter applying improvements - BEFORE APPLYING: Read the reference for detailed rules and good/bad patterns
- EDGE CASE: If request scope is ambiguous, stop and ask a clarifying question before applying changes
- EDGE CASE: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance
When to use this skill
- Review Java code for Spring Boot unit tests
- Apply best practices for Spring Boot unit tests in Java code
- Write Mockito-first unit tests for Spring Boot services
- Avoid unnecessary @SpringBootTest in Spring unit tests
- Review Spring Boot slice-free unit test design
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 65 lines · 176 tokens per session scan A 9befe50b0a9e
321-frameworks-spring-boot-testing-unit-tests is a skill published in the GitHub repository jabrena/plinth (437 stars, last pushed today), licensed Apache-2.0. It adds 176 tokens to every session and 821 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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