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Agent skill

Java Testing

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java.

MITAuto-check passedTesting & QA

Install Java Testing

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill java-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard java-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/java/java-testing .claude/skills/java-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
java-testing
GitHub stars
571
Token cost
~1k tokens
SKILL.md length
399 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java.

  • Reviewing Java test behavior
  • SKILL.md covers Priority: P0 (CRITICAL), Core Rule Anchors, Implementation Guidelines and Anti-Patterns, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Including parallel execution and BDD

What it does

Java Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java. Use when writing or reviewing Java test behavior, including parallel execution and BDD; defer Kotlin-only tests, virtual-thread test infrastructure, and coverage-report/tooling configuration.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/junit-template.md`).

It sits in Testing & QA, covering Integration testing, Backend development and Android development. It works with Java, JUnit, Spring Boot and Kotlin. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Reviewing Java test behavior
  • Including parallel execution and BDD
  • Defer Kotlin-only tests
  • Virtual-thread test infrastructure

Example prompts

  • “/java-testing”

What it can do on your machine

Read from SKILL.md and the folder at commit 73422bd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Java Testing loads about 1k tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 77 tokens; SKILL.md has 399 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~77
When it runs · the whole SKILL.md, loaded when a task matches
~1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit 73422bd, republished under its MIT licence (© HoangNguyen0403). 399 words, ~1,041 tokens.

Download SKILL.mdSave it as .claude/skills/java-testing/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
java-testing
description
Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java. Use when writing or reviewing Java test behavior, including parallel execution and BDD; defer Kotlin-only tests, virtual-thread test infrastructure, and coverage-report/tooling configuration.

Java Testing Standards

Priority: P0 (CRITICAL)

Core Rule Anchors

  • [BE-TEST-01] Parameterized Tests for Equivalent Cases: Prefer @ParameterizedTest (@CsvSource, @MethodSource) when methods have multiple equivalent inputs or boundary permutations. Distinct scenarios may stay separate test methods. Reviewers must not demand parameterized rewrites without a behavioral gap.
  • [BE-TEST-02] Ban on Brittle DB Mock String Matching: Do not use string-matching mocks for raw SQL queries. Test pure domain calculations directly, or use Testcontainers for database repository verification.
  • [BE-TEST-03] Ban on Shallow Assertions: Never assert only assertThat(result).isNotNull() without inspecting domain fields, status codes, and invariants.
  • [BE-TEST-04] Ban on Pass-Through Interface Mocks: Repositories and service handlers must test contract compliance and error mapping. Ban 1:1 pass-through mock echoing without contract assertions.
  • [BE-TEST-05] Bug-First Regression Lock: Every PR fixing a bug ticket or with title fix(...) must introduce a test reproducing the defect prior to the fix.

Implementation Guidelines

  • JUnit 5 (Jupiter): Use @Test, @BeforeEach, and @AfterEach. Avoid JUnit 4 classes.
  • Fluent Assertions: Use AssertJ (assertThat) over JUnit assertEquals — enhanced readability.
  • Naming: Use MethodName_State_Result or @DisplayName("Check if X when Y").
  • Parameterized Tests ([BE-TEST-01]): Use @ParameterizedTest with @ValueSource, @CsvSource, or @MethodSource.
  • Mocking Strategy ([BE-TEST-04]): Use Mockito with @ExtendWith(MockitoExtension.class). Use @Mock, @Spy, and @InjectMocks. NEVER mock data-only Records.
  • Integration Testing ([BE-TEST-02]): Use Testcontainers with @Container for real databases (PostgreSQL/Redis) in integration tests (*IT.java).
  • Isolation: Each test method MUST be isolated and independent; use @DirtiesContext sparingly.
  • AssertJ Chaining ([BE-TEST-03]): Chain assertions for clarity: assertThat(result).isNotNull().hasSize(2).contains("X").
  • Mocking Verification: Audit observable contract outcomes and state changes; do not assert mock call counts or invocation sequences as a proxy for correctness.
  • Exceptions: Use assertThatThrownBy(() -> ...) to verify specific Exception types and messages.
  • Coverage: Coverage is diagnostic and project-configured; verify risk-weighted critical paths rather than padding code for an arbitrary percentage.
Show full SKILL.md (113 more words)Show less

Anti-Patterns

  • [BE-TEST-01] Stylistic parameterized rewrites: Do not demand parameterized refactoring of passing tests without a behavioral gap.
  • [BE-TEST-02] Brittle DB mock string matching: Do not match raw SQL strings in mocks; use Testcontainers.
  • [BE-TEST-03] Shallow assertions: Never assert only assertThat(result).isNotNull() without domain inspection.
  • [BE-TEST-04] Pass-through mock echoing: Ban 1:1 mock echoing without contract verification.
  • [BE-TEST-05] Bug fix without reproduction test: Ban bug fixes without a regression test.
  • No Logic in Tests: Keep tests declarative; no loops or if/else branching.
  • No System.out in Tests: Use assertions; never print to stdout.
  • No Legacy Assertions: Use assertThat(a).isEqualTo(b), not assertTrue(a == b).
  • No Shared State: Tests must be isolated and order-independent.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/java/java-testing of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/junit-template.md

Open the folder on GitHubat commit 73422bd

Compare with similar skills

Java Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Java Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Java Testing this skillHoangNguyen0403/agent-skills-standard571—~1kAutomated safety check: PassMIT
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Create Spring Boot Kotlin Projectgithub/awesome-copilot40k1 repos~1kAutomated safety check: PassMIT
Springboot TDDaffaan-m/ECC275k3 repos~813Automated safety check: PassMIT
Springboot TDDaffaan-m/ECC275k—~996Automated safety check: PassMIT
322 Frameworks Spring Boot Testing Integration Testsjabrena/plinth446—~935Automated safety check: PassApache-2.0

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Works with

Categories

Questions about Java Testing

What does Java Testing do?

Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java. Java Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Testing standards using JUnit 5, AssertJ, Mockito, Cucumber, and Spring Boot integration tests for Java.

When should I use Java Testing?

Java Testing fits situations like: reviewing Java test behavior; including parallel execution and BDD; defer Kotlin-only tests; virtual-thread test infrastructure.

How do I install Java Testing in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill java-testing -a claude-code`. Or copy the skill folder (skills/java/java-testing in HoangNguyen0403/agent-skills-standard) into .claude/skills/java-testing in your project. Claude Code loads it when a task matches its description.

How do I install Java Testing in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill java-testing -a codex`. Or copy the skill folder (skills/java/java-testing in HoangNguyen0403/agent-skills-standard) into .agents/skills/java-testing in your project. Codex loads it when a task matches its description.

Can I use Java Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill java-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/java-testing, .gemini/skills/java-testing, .github/skills/java-testing and .opencode/skills/java-testing in your project.

What does Java Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Java Testing is instructions for the agent only.

Does Java Testing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Java Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Java Testing use?

Java Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Java Testing use?

About 1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 385 tokens, read only when the agent opens those files.

What are the alternatives to Java Testing?

Skills that share tags, products or a category with Java Testing: Test Reviewer (axelixlabs/axelix, 148 stars), Create Spring Boot Kotlin Project (github/awesome-copilot, 40k stars), Springboot TDD (affaan-m/ECC, 275k stars) and Springboot TDD (affaan-m/ECC, 275k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Java Testing?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 571 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 7, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.