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README.md

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+---
+license: apache-2.0
+base_model: Qwen/Qwen2.5-Coder-7B-Instruct
+base_model_relation: finetune
+language:
+- en
+- code
+library_name: mlx
+pipeline_tag: text-generation
+tags:
+- go
+- golang
+- testing
+- table-driven-tests
+- guildlm
+- code-guild
+- mlx
+---
+
+# GuildLM · go-test
+
+**A small, sharp Go *testing* specialist from the GuildLM Code Guild.**
+
+`go-test` writes thorough, **table-driven** Go tests with real assertions and meaningful edge cases — the kind of tests that actually fail when the code is wrong. It is one of three specialists in the GuildLM Code Guild ([`go-dev`](https://huggingface.co/guildlm/go-dev) · `go-test` · [`go-review`](https://huggingface.co/guildlm/go-review)) built to work together in a **verification-driven agent loop**.
+
+> **Why a dedicated test model?** Across every GuildLM experiment, writing tests is the one job where targeted fine-tuning *clearly* beats the base. On a mutation benchmark — inject a bug, does the generated test catch it? — `go-test` catches **14/18 (78%)** versus **7/18 (39%)** for the untuned base. **It catches twice as many real bugs as the model it's built on.** Test-writing is genuinely where specialization pays. See the [research log, Report #2](https://guildlm.github.io/research/2026-06-28-go-test-mutation.html).
+
+---
+
+## Why this isn't "just Qwen with a name"
+
+`go-test` is a **fused, standalone** model (no separate adapter) with its **own identity** — ask who it is and it answers *GuildLM go-test*. It is an honest Apache-2.0 derivative of [Qwen2.5-Coder-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-Coder-7B-Instruct), fine-tuned for one craft: testing Go.
+
+## What it's for
+
+- Generating `*_test.go` files: table-driven cases, sub-tests, `httptest`, `sync/atomic` for concurrency checks.
+- Covering the edges a tired human skips: empty input, zero values, negatives, inverted bounds, error paths.
+- Acting as the *testing* role inside the [GuildLM Builder](https://github.com/guildlm/builder), so the code that `go-dev` writes is held to a real, executable contract.
+
+## Benchmarks
+
+Measured locally with the real Go toolchain — tests are scored by whether they **compile, assert, and catch injected mutations**, not by an LLM judge.
+
+<!-- BENCH:go-test -->
+| Benchmark | Metric | **go-test** | base 7B |
+|---|---|---|---|
+| crucible `go_test_bench` (18 mutations) | bug-catch@1 | **14/18 · 78%** | 7/18 · 39% |
+
+> This is the GuildLM specialist where the fine-tuning win is **real, large, and repeatable** — `go-test` catches 2× the injected bugs of its base. A guard in the [Builder](https://github.com/guildlm/builder) also rejects trivially-passing tests (no assertions), so its output is held to a real bar in the loop.
+
+## Quickstart
+
+### Apple Silicon (MLX)
+
+```bash
+pip install mlx-lm
+python -m mlx_lm generate --model guildlm/go-test \
+  --prompt "Write table-driven Go tests for func Clamp(x, lo, hi int) int covering below/inside/above range and inverted bounds." \
+  --max-tokens 400
+```
+
+### Ollama (GGUF)
+
+```bash
+ollama run guildlm/go-test "Write httptest-based tests for a POST /echo JSON endpoint built with newMux()."
+```
+
+### Inside the agent loop (recommended)
+
+```bash
+python -m mlx_lm server --model guildlm/go-test --port 8081
+guildlm-build --spec specs/myservice.yaml --out ./out \
+  --base-url http://localhost:8080/v1 \
+  --test-model guildlm/go-test --test-base-url http://localhost:8081/v1 \
+  --candidates 3
+```
+
+## Prompting
+
+Trained with the system prompt:
+
+> *You are GuildLM go-test, a Go testing specialist from the GuildLM Code Guild.*
+
+Give it a function signature or an implementation and ask for tests. It defaults to table-driven style with explicit `t.Errorf`/`t.Fatalf` assertions.
+
+## The Guild
+
+| Specialist | Job |
+|---|---|
+| [**go-dev**](https://huggingface.co/guildlm/go-dev) | writes the implementation |
+| [**go-test**](https://huggingface.co/guildlm/go-test) | writes thorough table-driven tests |
+| [**go-review**](https://huggingface.co/guildlm/go-review) | audits for bugs a green build hides |
+
+- Agent loop: **https://github.com/guildlm/builder**
+- Research log: **https://guildlm.github.io/research/**
+
+## License & attribution
+
+Apache-2.0, inherited from [Qwen2.5-Coder-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-Coder-7B-Instruct) (© Alibaba Cloud). GuildLM fine-tuning, identity, and packaging under the same license. Trained locally on Apple Silicon with MLX — **total cloud spend: $0**.