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Test Maintainability Assessment · dotnet | DecimalAI

testingby dotnet

Test Maintainability Assessment

dotnet/exp-test-maintainability

Source dotnet/skills ↗License MIT

Detects duplicate boilerplate, copy-paste tests, and structural maintainability issues across .NET test suites.

NewMaintained

Automatic

QA & Test Engineering pack

Last verified 8/9/2026

What it changes

Passed 11 of 21 test cases with the skill, and 11 of 21 without it.

Without skill50%

With skill50%

Checks it passed that the model alone missed

The response ranks refactoring recommendations based on occurrence count.
The response recommends against extracting a helper method because the pattern appears in only two test methods.

2 fixed13 passed either way6 still failing1 broke

Pass-rate lift: 0 pp
Tokens: +88%
Agent turns: 0%
Response time: +5%

Model gemini-3.6-flashMeasured 8/9/2026v115 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/dotnet-exp-test-maintainability/SKILL.md https://app.decimal.ai/s/dotnet-exp-test-maintainability/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add dotnet-exp-test-maintainability, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/dotnet-exp-test-maintainability/ and pins it in .decimal/skills.lock

decimalai skills add dotnet-exp-test-maintainability

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/dotnet-exp-test-maintainability/SKILL.md https://app.decimal.ai/s/dotnet-exp-test-maintainability/SKILL.md

Raw file: /s/dotnet-exp-test-maintainability/SKILL.md ↗ · machine-readable summary at /s/dotnet-exp-test-maintainability.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

I noticed two test methods in `InvoiceServiceTests.cs` both write `var service = new InvoiceService(new FakeLogger(), new FakeRepository());`. Should we extract this setup into a shared helper method?

What was checked, without and with the skill
Checked	Without skill	With skill
The response recommends against extracting a helper method because the pattern appears in only two test methods.	Missed	Passed

case-04 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md198 linessingle file

Test Maintainability Assessment

Analyze .NET test code for maintainability issues: duplicated boilerplate, copy-paste test methods, and structural repetition across test methods and classes. Produce a report of refactoring opportunities with concrete before/after suggestions. The goal is analysis only — do not modify any files.

When to Use

User asks to find duplicated code or boilerplate in tests
User wants to know where test code can be DRY-ed up
User asks to reduce test duplication, improve test readability, or clean up test boilerplate
User asks for refactoring opportunities in a test suite
User wants to identify shared setup or teardown candidates
User asks "what patterns repeat across my tests?"
User wants to centralize test data, introduce builders or helpers

When Not to Use

User wants to write new tests from scratch (use writing-mstest-tests)
User wants to detect anti-patterns or code smells (use test-anti-patterns)
User wants to actually perform the refactoring (help them directly, this skill only analyzes)

Inputs

Input	Required	Description
Test code	Yes	One or more test files or a test project directory to analyze
Production code	No	The code under test, for context on what abstractions might help
Scope	No	Whether to analyze within a single class or across multiple classes

Workflow

Step 1: Gather the test code

Read all test files the user provides or references. If the user points to a directory or project, scan for all test files using these framework markers:

Framework	Test class markers	Test method markers
MSTest	`[TestClass]`	`[TestMethod]`, `[DataTestMethod]`
xUnit	(none — convention-based)	`[Fact]`, `[Theory]`
NUnit	`[TestFixture]`	`[Test]`, `[TestCase]`, `[TestCaseSource]`
TUnit	(none — convention-based)	`[Test]`

Track record

Benchmark

11 / 21

test cases passed, vs 11 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

dotnet / skills

plugins/dotnet-experimental/skills/exp-test-maintainability/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Test Maintainability Assessment

When to Use

When Not to Use

Inputs

Workflow

Step 1: Gather the test code

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills