Agent skill

Unit Test Mapper Converter

by giuseppe-trisciuoglio in giuseppe-trisciuoglio/developer-kit

Provides patterns for unit testing mappers, converters, and bean mappings.

MITAuto-check: notesTesting & QA

Install Unit Test Mapper Converter

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a claude-code

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

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter --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/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .claude/skills/unit-test-mapper-converter && 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/

Paste into Claude Code

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .claude/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .agents/skills/unit-test-mapper-converter && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .agents/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .cursor/skills/unit-test-mapper-converter && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .cursor/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/giuseppe-trisciuoglio/developer-kit.git --path plugins/developer-kit-java/skills/unit-test-mapper-converter

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .gemini/skills/unit-test-mapper-converter && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .gemini/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .github/skills/unit-test-mapper-converter && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .github/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install giuseppe-trisciuoglio/developer-kit unit-test-mapper-converter --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/developer-kit-java/skills/unit-test-mapper-converter .opencode/skills/unit-test-mapper-converter && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "unit-test-mapper-converter" agent skill from https://github.com/giuseppe-trisciuoglio/developer-kit/tree/main/plugins/developer-kit-java/skills/unit-test-mapper-converter into .opencode/skills/unit-test-mapper-converter/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unit-test-mapper-converter", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: unit-test-mapper-converter
GitHub stars: 357
Token cost: ~1.2k tokens
SKILL.md length: 374 words
Files: 2 (incl. references)
Skills in repo: 115
Repo updated: Sep 10, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Provides patterns for unit testing mappers, converters, and bean mappings.

Works in 6 steps: Validate Generated Mapper Classes → Test Null Handling → Test Bidirectional Mapping → …
Writing mapping tests
SKILL.md covers Overview, When to Use, Instructions and Best Practices, plus 2 more sections
Calls mvn

What it does

Unit Test Mapper Converter is an agent skill from giuseppe-trisciuoglio/developer-kit. Provides patterns for unit testing mappers, converters, and bean mappings. Validates entity-to-DTO and model transformation logic in isolation. Generates executable mapping tests with MapStruct and custom converter test coverage. Use when writing mapping tests, converter tests, entity mapping tests, or ensuring correct data transformation between DTOs and domain objects.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/examples.md`).

It sits in Testing & QA, covering Unit testing, Test coverage and Data cleaning. The repository describes itself as: Modular plugin marketplace for Claude Code and agentic CLIs, with validated, spec-driven skills, agents, commands, and workflows for Java, TypeScript, Python, PHP, AWS, and AI. The licence is MIT.

When your agent uses it

Writing mapping tests
Converter tests
Entity mapping tests
Ensuring correct data transformation between DTOs and domain objects

Example prompts

“Use the unit-test-mapper-converter skill to provide patterns for unit testing mappers, converters, and bean mappings”
“/unit-test-mapper-converter”

Requirements

Pre-approved tools (allowed-tools): Read, Write, Bash, Glob, Grep

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Validate Generated Mapper Classes
Test Null Handling
Test Bidirectional Mapping
Test Nested Object Mapping
Test Custom Expressions
Test Enum Mappings

What it can do on your machine

Read from SKILL.md and the folder at commit fe73fb3. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
- Read
- Write
- Bash
- Glob
- Grep
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- mvn
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

Unit Test Mapper Converter loads about 1.2k tokens when it runs, and up to ~3.2k if it reads all its reference files. Until then it costs about 100 tokens; SKILL.md has 374 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~100
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~3.2k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
```
allowed-tools: Read, Write, Bash, Glob, Grep
```

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 giuseppe-trisciuoglio/developer-kit at commit fe73fb3, republished under its MIT licence (© giuseppe-trisciuoglio). 374 words, ~1,239 tokens.

Download SKILL.mdSave it as .claude/skills/unit-test-mapper-converter/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: unit-test-mapper-converter
description: Provides patterns for unit testing mappers, converters, and bean mappings. Validates entity-to-DTO and model transformation logic in isolation. Generates executable mapping tests with MapStruct and custom converter test coverage. Use when writing mapping tests, converter tests, entity mapping tests, or ensuring correct data transformation between DTOs and domain objects.
allowed-tools: Read, Write, Bash, Glob, Grep

Unit Testing Mappers and Converters

Overview

Provides patterns for unit testing MapStruct mappers and custom converter classes. Covers field mapping accuracy, null handling, type conversions, nested object transformations, bidirectional mapping, enum mapping, and partial updates.

When to Use

Writing mapping tests for MapStruct mapper implementations
Testing custom entity-to-DTO converters and bean mappings
Validating nested object mapping and collection transformations

Instructions

1. Validate Generated Mapper Classes

Before testing, verify generated mapper classes exist:

bash

# Maven
ls target/generated-sources/

# Gradle
ls build/generated/sources/

If generated classes are missing:

Run mvn compile (Maven) or ./gradlew compileJava (Gradle)
Check that the MapStruct annotation processor is configured
Verify @Mapper interfaces are in a compiled source set

2. Test Null Handling

java

assertThat(mapper.toDto(null)).isNull();

Configure nullValueMappingStrategy in mapper if null should return empty/default.

If null tests fail:

Add nullValueMappingStrategy = NullValueMappingStrategy.RETURN_NULL to @Mapper
Or use nullValuePropertyMappingStrategy for nested property handling

3. Test Bidirectional Mapping

java

User restored = mapper.toEntity(mapper.toDto(original));
assertThat(restored).usingRecursiveComparison().isEqualTo(original);

If bidirectional tests fail:

Check @Mapping annotations for field name mismatches
Verify both directions are explicitly mapped if auto-mapping fails
Use unmappedTargetPolicy = ReportingPolicy.ERROR to catch missing mappings

4. Test Nested Object Mapping

java

assertThat(dto.getNested()).usingRecursiveComparison().isEqualTo(expected);

If nested tests fail:

Ensure nested mapper exists or is referenced via uses = NestedMapper.class
Check collection element mappings with elementMappingStrategy

5. Test Custom Expressions

Custom expressions in @Mapping(target = "field", expression = "java(...)") are not compile-time validated.

If expression tests fail:

Verify the expression syntax and method signatures
Check that imported classes are accessible from the expression context

Show full SKILL.md (139 more words)Show less

6. Test Enum Mappings

Use @ValueMapping for enum-to-enum translations. Test all enum values exhaustively.

Best Practices

Use Mappers.getMapper() for standalone tests, Spring injection for integration tests
Use usingRecursiveComparison() for complex nested structures
Test all mapper methods including collection transformations
Verify null handling for all nullable source fields
Test bidirectional mapping catches asymmetries between entity→DTO and DTO→entity
Keep mapper tests focused on transformation correctness, not implementation details

Constraints and Warnings

Compile-time generation: MapStruct generates code at compile time—verify generated classes exist before running tests
Null handling: Configure nullValueMappingStrategy and nullValuePropertyMappingStrategy appropriately
Expression validation: Expressions in @Mapping are not validated at compile time—test them explicitly
Circular dependencies: MapStruct cannot handle circular dependencies between mappers
Collection immutability: Mapping immutable collections may require special configuration
Date/Time: Verify date/time objects map correctly across timezones

Examples

Complete executable test with imports:

java

package com.example.mapper;

import org.junit.jupiter.api.Test;
import org.mapstruct.factory.Mappers;
import static org.assertj.core.api.Assertions.*;

class UserMapperCompleteTest {
  private final UserMapper mapper = Mappers.getMapper(UserMapper.class);

  @Test
  void shouldMapUserToDto() {
    User user = new User(1L, "Alice", "alice@example.com", 25);
    UserDto dto = mapper.toDto(user);
    assertThat(dto)
      .isNotNull()
      .extracting(UserDto::getName, UserDto::getEmail)
      .containsExactly("Alice", "alice@example.com");
  }

  @Test
  void shouldMaintainRoundTrip() {
    User original = new User(1L, "Alice", "alice@example.com", 25);
    assertThat(mapper.toEntity(mapper.toDto(original)))
      .usingRecursiveComparison()
      .isEqualTo(original);
  }

  @Test
  void shouldHandleNullInput() {
    assertThat(mapper.toDto(null)).isNull();
  }
}

Additional examples in: references/examples.md

Files

SKILL.md and 1 other file (references) in plugins/developer-kit-java/skills/unit-test-mapper-converter of giuseppe-trisciuoglio/developer-kit.

SKILL.md
references/examples.md

Open the folder on GitHubat commit fe73fb3

Compare with similar skills

Unit Test Mapper Converter 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.

Unit Test Mapper Converter compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Unit Test Mapper Converter this skillgiuseppe-trisciuoglio/developer-kit	357	—	~1.2k	Automated safety check: Notes	MIT	1 mo ago
Atdd Mutateswingerman/engineer	154	—	~2.7k	Automated safety check: Pass	MIT	18 days ago
Test Writerhamzafarooq/claude-code-starter	145	—	~345	Automated safety check: Pass	MIT	27 days ago
Memstack Development Test Writercwinvestments/memstack	423	—	~3.7k	Automated safety check: Pass	Proprietary	14 days ago
Test Coverageluongnv89/skills	131	—	~3.2k	Automated safety check: Pass	MIT	2 days ago
Post Dev Testsd0xdev/sd0x-harness	192	—	~1.8k	Automated safety check: Notes	MIT	3 days ago

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Questions about Unit Test Mapper Converter

What does Unit Test Mapper Converter do?

Provides patterns for unit testing mappers, converters, and bean mappings. Unit Test Mapper Converter is an agent skill from giuseppe-trisciuoglio/developer-kit. Provides patterns for unit testing mappers, converters, and bean mappings.

When should I use Unit Test Mapper Converter?

Unit Test Mapper Converter fits situations like: writing mapping tests; converter tests; entity mapping tests; ensuring correct data transformation between DTOs and domain objects.

How do I install Unit Test Mapper Converter in Claude Code?

Run `npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a claude-code`. Or copy the skill folder (plugins/developer-kit-java/skills/unit-test-mapper-converter in giuseppe-trisciuoglio/developer-kit) into .claude/skills/unit-test-mapper-converter in your project. Claude Code loads it when a task matches its description.

How do I install Unit Test Mapper Converter in Codex?

Run `npx skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a codex`. Or copy the skill folder (plugins/developer-kit-java/skills/unit-test-mapper-converter in giuseppe-trisciuoglio/developer-kit) into .agents/skills/unit-test-mapper-converter in your project. Codex loads it when a task matches its description.

Can I use Unit Test Mapper Converter 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 giuseppe-trisciuoglio/developer-kit --skill unit-test-mapper-converter -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/unit-test-mapper-converter, .gemini/skills/unit-test-mapper-converter, .github/skills/unit-test-mapper-converter and .opencode/skills/unit-test-mapper-converter in your project.

What does Unit Test Mapper Converter need to run?

Going by SKILL.md and its folder, Unit Test Mapper Converter needs the command-line tools its instructions call (mvn). Its frontmatter pre-approves these tools: Read, Write, Bash, Glob, Grep.

Does Unit Test Mapper Converter 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 Unit Test Mapper Converter safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Unit Test Mapper Converter use?

Unit Test Mapper Converter 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 Unit Test Mapper Converter use?

About 1.2k tokens (SKILL.md is roughly 5k 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 1.9k tokens, read only when the agent opens those files.

What are the alternatives to Unit Test Mapper Converter?

Skills that share tags, products or a category with Unit Test Mapper Converter: Atdd Mutate (swingerman/engineer, 154 stars), Test Writer (hamzafarooq/claude-code-starter, 145 stars), Memstack Development Test Writer (cwinvestments/memstack, 423 stars) and Test Coverage (luongnv89/skills, 131 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Unit Test Mapper Converter?

giuseppe-trisciuoglio (a GitHub user) maintains it in giuseppe-trisciuoglio/developer-kit, which has 357 GitHub stars. The repository holds 115 skills in this directory. The repository was last updated on September 10, 2026.

Source: giuseppe-trisciuoglio/developer-kit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Unit Test Mapper Converter

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Unit Testing Mappers and Converters

Overview

When to Use

Instructions

1. Validate Generated Mapper Classes

2. Test Null Handling

3. Test Bidirectional Mapping

4. Test Nested Object Mapping

5. Test Custom Expressions

6. Test Enum Mappings

Best Practices

Constraints and Warnings

Examples

Files

Compare with similar skills

Similar skills

More from giuseppe-trisciuoglio/developer-kit

Related

Questions about Unit Test Mapper Converter