Tunit

What it does

When your agent uses it

• A repo uses TUnit
• TUnit.Playwright
• ClassDataSource
• SharedType.PerTestSession

Example prompts

• “/tunit”

Workflow steps

10 steps, taken from the first numbered list in SKILL.md.

1. 1Confirm the project really uses TUnit and not a different MTP-based framework.
2. 2Read the repo's real test command from AGENTS.md. If the repo has no explicit command yet, start with dotnet test PROJECT_OR_SOLUTION.
3. 3Keep the TUnit execution model intact
4. 4Choose the fixture level deliberately
5. 5Reuse expensive fixtures with ClassDataSource(Shared = SharedType.PerTestSession) instead of booting distributed infrastructure per test…
6. 6Keep tests and test modules parallel. Do not add --max-parallel-test-modules 1, TUNIT_MAX_PARALLEL_TESTS=1, [assembly: NotInParallel], a…
7. 7Use keyed [NotInParallel("collision-domain")] only on the smallest tests that perform destructive changes to the same shared state and can…
8. 8Run the narrowest useful scope first with dotnet test ... --treenode-filter "..." on .NET 10. Use the older -- separator only when the…
9. 9Follow Test Output Budget: show bounded root-error evidence and link coverage, Playwright screenshots, and HTML artifacts; never dump host…
10. 10Use [Test], [Arguments], hooks, and dependencies only when they make the scenario clearer, not because the framework allows it.

What it can do on your machine

Read from SKILL.md and the folder at commit 535dd55. 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

  Shell commands in SKILL.md call:

  • dotnet
  • rg

  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

Tunit loads about 2.1k tokens when it runs, and up to ~11k if it reads all its reference files. Until then it costs about 93 tokens; SKILL.md has 844 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~93

When it runs · the whole SKILL.md, loaded when a task matches

~2.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~11k

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

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 managedcode/dotnet-skills at commit 535dd55, republished under its MIT licence (© managedcode). 844 words, ~2,069 tokens.

name

tunit

description

Write, run, or repair .NET tests that use TUnit. Use when a repo uses `TUnit`, `TUnit.Playwright`, `[Test]`, `[Arguments]`, `ClassDataSource`, `SharedType.PerTestSession`, or Microsoft.Testing.Platform-based execution. Preserve TUnit's parallel-by-default model and constrain only destructive shared-state collisions. DO NOT USE FOR: xUnit projects; MSTest projects.

flowchart LR
  A["TUnit task"] --> B{"What does the test need?"}
  B -->|"Single component only"| C["Plain TUnit test"]
  B -->|"HTTP / SignalR / resource graph"| D["Shared Aspire/AppHost fixture"]
  B -->|"Host DI / grains / runtime services"| E["Shared Aspire/AppHost fixture + WebApplicationFactory"]
  B -->|"Browser automation"| F["Shared Aspire/AppHost fixture + Playwright"]
  C & D & E & F --> G["Run focused with --treenode-filter"]
  G --> H["Show bounded errors and link artifacts"]

# Run all tests
dotnet test --solution MySolution.sln

# Run one test project
dotnet test --project tests/MyProject.Tests/MyProject.Tests.csproj

# Filter by class
dotnet test --project tests/MyProject.Tests/MyProject.Tests.csproj --treenode-filter "/*/*/CalculatorTests/*"

# Filter by category
dotnet test --project tests/MyProject.Tests/MyProject.Tests.csproj --treenode-filter "/*/*/*/*[Category=Integration]"

# Coverage on Microsoft.Testing.Platform
dotnet test --solution MySolution.sln --coverage --coverage-output coverage.cobertura.xml --coverage-output-format cobertura

# Raw runner help when the repo needs direct TUnit app switches
dotnet run --project tests/MyProject.Tests/MyProject.Tests.csproj -- --help

© managedcode, 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 5 other files (references) in catalog/Testing/TUnit/skills/tunit of managedcode/dotnet-skills.

• SKILL.md
• manifest.json
• references/integration-testing.md
• references/migration.md
• references/patterns.md
• references/tunit.md

Open the folder on GitHubat commit 535dd55