Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add userInner/SKILLS --skill fsharp-testing-affaan-m-eccgit clone --depth 1 https://github.com/userInner/SKILLSWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/userinner/skills/fsharp-testing-affaan-m-ecc)<a href="https://agentmods.dev/skills/userinner/skills/fsharp-testing-affaan-m-ecc"><img src="https://agentmods.dev/badge/skills/userinner/skills/fsharp-testing-affaan-m-ecc/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/userinner/skills/fsharp-testing-affaan-m-ecc"><img src="https://agentmods.dev/badge/skills/userinner/skills/fsharp-testing-affaan-m-ecc.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.01952 |
| Opus 5.5 | $0.00021 | $0.00781 |
| Sonnet 5.5 | $0.00011 | $0.00390 |
| Haiku 4.5 | $0.00005 | $0.00195 |
Grade A, and why
fsharp-testing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
92% identical to fsharp-testing — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 282 lines — stays where its author put it; the contents beside it link to each section on GitHub.
F# Testing Patterns
Comprehensive testing patterns for F# applications using xUnit, FsUnit, Unquote, FsCheck, and modern .NET testing practices.
When to Activate
- Writing new tests for F# code
- Reviewing test quality and coverage
- Setting up test infrastructure for F# projects
- Debugging flaky or slow tests
Test Framework Stack
| Tool | Purpose |
|---|---|
| xUnit | Test framework (standard .NET ecosystem choice) |
| FsUnit.xUnit | F#-friendly assertion syntax for xUnit |
| Unquote | Assertion library using F# quotations for clear failure messages |
| FsCheck.xUnit | Property-based testing integrated with xUnit |
| NSubstitute | Mocking .NET dependencies |
| Testcontainers | Real infrastructure in integration tests |
| WebApplicationFactory | ASP.NET Core integration tests |
Unit Tests with xUnit + FsUnit
Basic Test Structure
module OrderServiceTests
open Xunit
open FsUnit.Xunit
[<Fact>]
let ``create sets status to Pending`` () =
let order = Order.create "cust-1" [ validItem ]
order.Status |> should equal Pending
[<Fact>]
let ``confirm changes status to Confirmed`` () =
let order = Order.create "cust-1" [ validItem ]
let confirmed = Order.confirm order
confirmed.Status |> should be (ofCase <@ Confirmed @>)
Assertions with Unquote
Unquote uses F# quotations so failure messages show the full expression that failed, not just "expected X got Y".
module OrderValidationTests
open Xunit
open Swensen.Unquote
[<Fact>]
let ``PlaceOrder returns success when request is valid`` () =
let request = { CustomerId = "cust-123"; Items = [ validItem ] }
let result = OrderService.placeOrder request
test <@ Result.isOk result @>
[<Fact>]
let ``order total sums item prices`` () =
let items = [ { Sku = "A"; Quantity = 2; Price = 10m }
{ Sku = "B"; Quantity = 1; Price = 5m } ]
let total = Order.calculateTotal items
test <@ total = 25m @>
[<Fact>]
let ``validated email rejects empty input`` () =
let result = ValidatedEmail.create ""
test <@ Result.isError result @>
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 282 lines · 53 tokens per session scan A d89f8cb5235f
fsharp-testing is a skill published in the GitHub repository userInner/SKILLS (3 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 53 tokens to every session and 1,952 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 92% identical to fsharp-testing, differing in 2 lines, and is treated as a copy.
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