131-java-testing-unit-testing

Use when you need to review, improve, or write Java unit tests — including migrating from JUnit 4 to JUnit 5, adopting AssertJ for fluent assertions, structuring tests with Given-When-Then, ensuring test independence, applying parameterized tests, mocking dependencies with Mockito, verifying boundary conditions (RIGHT-BICEP, CORRECT, A-TRIP), leveraging JSpecify null-safety annotations, or eliminating testing anti-patterns such as reflection-based tests or shared mutable state. This should trigger for requests such as Review Java code for unit tests; Apply best practices for unit tests in Java code. Part of cursor-rules-java project

Quality

—

Does it follow best practices?

Impact

—

No eval scenarios have been run

Securityby

Passed

No known issues

Quality

Content

70%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

Well-structured body with a clear, validated workflow and good single-level reference disclosure. Weaker on conciseness (redundancy between Constraints and Workflow) and actionability (test-writing guidance is abstract and deferred without inline examples).

Suggestions

Remove the redundant compile/verify bullets from the Constraints section since the Workflow already specifies them, or vice versa.

Add one or two short inline good/bad test snippets (e.g. a JUnit 5 + AssertJ example) so the body is actionable without forcing a reference read.

Drop the 'When to use this skill' section since it duplicates the frontmatter description triggers.

Dimension	Reasoning	Score
Conciseness	Mostly efficient and well-organized, but the Constraints section repeats the compile/verify commands already stated in the Workflow, and 'When to use this skill' duplicates the description's triggers, so it could be tightened.	2 / 3
Actionability	Provides concrete executable commands ('./mvnw compile', 'mvn clean verify') and a specific reference path, but the core test-writing guidance ('Implement or refactor tests using JUnit 5, AssertJ, Mockito...') is abstract with no inline examples.	2 / 3
Workflow Clarity	A clear 4-step sequence with explicit validation checkpoints and a feedback loop: 'Run ./mvnw compile ... stop immediately if compilation fails' and 'Run ./mvnw clean verify after applying improvements'.	3 / 3
Progressive Disclosure	A concise overview with a single, clearly signaled one-level-deep reference (references/131-java-testing-unit-testing.md, verified to exist), referenced in both the Workflow and the Reference section, with well-organized sections for easy navigation.	3 / 3
	Total	10 / 12 Passed

Description

90%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, highly specific description with explicit trigger guidance and a clear niche. The only weakness is the second-person 'Use when you need to...' voice, which costs a specificity point under the rubric's voice rule.

Suggestions

Rewrite in third person to avoid the second-person 'Use when you need to review...'; e.g. 'Use when reviewing, improving, or writing Java unit tests — including...'.

Trim the lengthy enumerated capability list to the most common triggers to reduce verbosity while keeping distinctiveness.

Dimension	Reasoning	Score
Specificity	Lists many concrete actions ('migrating from JUnit 4 to JUnit 5, adopting AssertJ for fluent assertions, structuring tests with Given-When-Then, ... mocking dependencies with Mockito'), which would be a 3, but the phrasing 'Use when you need to review...' is second person, so specificity is reduced by 1 per the voice guideline.	2 / 3
Completeness	Clearly answers both what (review/improve/write Java unit tests plus enumerated capabilities) and when via an explicit 'Use when...' clause and a 'This should trigger for requests such as...' trigger list.	3 / 3
Trigger Term Quality	Includes natural user phrasings via 'This should trigger for requests such as Review Java code for unit tests; Apply best practices for unit tests in Java code', giving good coverage of terms users would actually say.	3 / 3
Distinctiveness Conflict Risk	The Java unit-testing niche with JUnit 5/AssertJ/Mockito/JSpecify and named methodologies (RIGHT-BICEP, A-TRIP) is a clear, distinct trigger set unlikely to conflict with other skills.	3 / 3
	Total	11 / 12 Passed

Validation

100%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository: jabrena/cursor-rules-java
Commit: 86eb63d

Reviewed: 1 day ago

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