CodeBench: Go-tuki — Chi + SQLite + httptest

- Golden example: todo-go/ (6/6 testit läpi)
- todo-go.md golden reference
- prompts/code-go.md koodigenerointi-prompti
- Dockerfile.go-test (golang:1.23-alpine)
- benchmark.mjs: LANG_CONFIG, parseTestOutput, prompt/golden-valinta Go:lle
- Käyttö: node benchmark.mjs --lang go --models qwen2.5-coder:32b

kipina-codebench/prompts/code-go.md

@@ -0,0 +1,69 @@
+You are a Go backend developer. Generate a Chi web project with SQLite.
+
+Given the project requirements, JSON specification, and a REFERENCE IMPLEMENTATION, generate these files:
+
+1. go.mod — module declaration, go-chi/chi/v5, modernc.org/sqlite
+2. models.go — Structs with json tags
+3. handlers.go — Handler closures for each CRUD endpoint
+4. main.go — Entry point with InitDB(), NewRouter(), main()
+5. handlers_test.go — Integration tests using httptest against in-memory SQLite
+
+Do NOT generate any other files. Do NOT generate go.sum.
+
+OUTPUT FORMAT — use these exact markers to separate files:
+
+=== go.mod ===
+<module content>
+
+=== models.go ===
+<go code>
+
+=== handlers.go ===
+<go code>
+
+=== main.go ===
+<go code>
+
+=== handlers_test.go ===
+<go code>
+
+DOCUMENTATION — structs get // one-line comments. Keep it brief.
+
+RULES:
+- Follow the REFERENCE IMPLEMENTATION patterns exactly
+- Chi router with chi.URLParam(r, "param") for path parameters
+- database/sql + modernc.org/sqlite (pure Go driver, no CGO required)
+- Import the driver as blank import: _ "modernc.org/sqlite"
+- Handlers are closures: func handler(db *sql.DB) http.HandlerFunc
+- INSERT/UPDATE queries use RETURNING clause to get the row back via QueryRow + Scan
+- POST returns 201 (http.StatusCreated), DELETE returns 204 (http.StatusNoContent), GET missing returns 404
+- Use sql.ErrNoRows for not-found checks: if err == sql.ErrNoRows { ... }
+- No compile-time query macros — use db.QueryRow(), db.Query(), db.Exec() directly
+- Empty slice not nil for list endpoints: if items == nil { items = []Item{} }
+- Optional fields use pointer types (*string, *int64) with json tag omitempty
+- Set Content-Type header: w.Header().Set("Content-Type", "application/json")
+- Parse path ID with strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
+- InitDB uses log.Fatal on error, NewRouter returns http.Handler
+- main() opens "file:app.db?mode=rwc" and listens on 127.0.0.1:3000
+- No markdown fences inside file content — just raw code
+- You MUST generate ALL 5 files. Do not stop early.
+
+TESTS — follow this exact setupTestServer pattern:
+
+func setupTestServer(t *testing.T) (*httptest.Server, *sql.DB) {
+    t.Helper()
+    db, err := sql.Open("sqlite", ":memory:")
+    if err != nil {
+        t.Fatal(err)
+    }
+    InitDB(db)
+    return httptest.NewServer(NewRouter(db)), db
+}
+
+- Each test function calls setupTestServer(t) to get (ts, db)
+- defer ts.Close() and defer db.Close() in every test
+- Use standard library: http.Post, http.Get, http.NewRequest for PUT/DELETE
+- Use strings.NewReader for JSON request bodies
+- Decode responses with json.NewDecoder(resp.Body).Decode(&body)
+- Unique descriptive data, NOT generic "test" strings
+- Format IDs with fmt.Sprintf("%.0f", id) when building URLs from float64