Add unit tests, integration test, CI workflow, and conventions

- gitea/client_test.go: mock HTTP tests for all API methods + error cases
- llm/client_test.go: mock tests for completion, errors, timeouts
- review/parser_test.go: JSON parsing, markdown fences, validation
- review/formatter_test.go: markdown output, empty/multiple findings
- review/prompt_test.go: system/user prompt construction
- integration_test.go: full end-to-end flow (build tag: integration)
- .gitea/workflows/ci.yml: test + vet + build on push, dual LLM review on PRs
- CONVENTIONS.md: coding standards for self-review dogfooding
- README.md: usage docs, env vars, architecture

.gitea/workflows/ci.yml

@@ -0,0 +1,53 @@
+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+      - run: go test ./...
+      - run: go vet ./...
+      - run: go build -o review-bot ./cmd/review-bot
+
+  review:
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'pull_request'
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+      - run: go build -o review-bot ./cmd/review-bot
+      - name: Run Sonnet Review
+        env:
+          GITEA_URL: ${{ github.server_url }}
+          GITEA_REPO: ${{ github.repository }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REVIEWER_TOKEN: ${{ secrets.SONNET_REVIEW_TOKEN }}
+          LLM_BASE_URL: ${{ secrets.LLM_BASE_URL }}
+          LLM_API_KEY: ${{ secrets.LLM_API_KEY }}
+          LLM_MODEL: "anthropic--claude-4.6-sonnet"
+          CONVENTIONS_FILE: "CONVENTIONS.md"
+          REVIEWER_NAME: "Sonnet"
+        run: ./review-bot
+      - name: Run GPT Review
+        env:
+          GITEA_URL: ${{ github.server_url }}
+          GITEA_REPO: ${{ github.repository }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REVIEWER_TOKEN: ${{ secrets.GPT_REVIEW_TOKEN }}
+          LLM_BASE_URL: ${{ secrets.LLM_BASE_URL }}
+          LLM_API_KEY: ${{ secrets.LLM_API_KEY }}
+          LLM_MODEL: "sap-ai-opus-latest-openai/gpt-5"
+          CONVENTIONS_FILE: "CONVENTIONS.md"
+          REVIEWER_NAME: "GPT"
+        run: ./review-bot

CONVENTIONS.md

@@ -0,0 +1,32 @@
+# Conventions
+
+## Language & Dependencies
+
+- Go standard library only — no external dependencies.
+- Target the latest stable Go release.
+
+## Error Handling
+
+- Return errors; never panic.
+- Wrap errors with context using `fmt.Errorf("context: %w", err)`.
+- Check all error returns.
+
+## Testing
+
+- Test every exported function.
+- Use `net/http/httptest` for HTTP mocking.
+- Table-driven tests where multiple inputs share the same assertion logic.
+- Integration tests use build tags (`//go:build integration`).
+
+## Style
+
+- Keep functions short and focused.
+- Prefer early returns over deep nesting.
+- Meaningful variable names — no single-letter names outside loop indices.
+- Comments explain *why*, not *what*.
+
+## Process
+
+- `go test ./...` must pass before commit.
+- `go vet ./...` must pass before commit.
+- Keep commits atomic and well-described.

README.md

@@ -1,58 +1,91 @@
 # review-bot
 
-AI-powered code review bot for Gitea pull requests.
+Automated code review bot for Gitea. Fetches a pull request diff, sends it to an LLM for analysis, and posts a structured review back to the PR.
 
-## Overview
+## Features
 
-`review-bot` fetches a PR's diff, title, description, and CI status from Gitea, sends it to an LLM via an OpenAI-compatible API, and posts a structured code review back to Gitea.
+- Fetches PR metadata, diff, and CI status from Gitea API
+- Sends context-rich prompts to any OpenAI-compatible LLM
+- Parses structured JSON review responses
+- Posts formatted reviews (APPROVE / REQUEST_CHANGES) back to Gitea
+- Supports custom coding conventions via repo files
+- Zero external dependencies — Go stdlib only
 
 ## Usage
 
 ```bash
 review-bot \
-  --gitea-url https://gitea.weiker.me \
+  --gitea-url https://gitea.example.com \
   --repo owner/name \
-  --pr 123 \
-  --reviewer-name "sonnet-review-bot" \
-  --reviewer-token "$(cat /path/to/token)" \
-  --llm-base-url "https://proxy.example.com/v1" \
-  --llm-api-key "key" \
-  --llm-model "anthropic--claude-4.6-sonnet" \
-  --conventions-file "CLAUDE.md"
+  --pr 42 \
+  --reviewer-token "$GITEA_TOKEN" \
+  --llm-base-url https://api.openai.com/v1 \
+  --llm-api-key "$OPENAI_API_KEY" \
+  --llm-model gpt-4 \
+  --reviewer-name "Sonnet" \
+  --conventions-file CONVENTIONS.md \
+  --dry-run
 ```
 
-All flags can also be set via environment variables:
+## Environment Variables
 
-| Flag | Env Var |
-|------|---------|
-| `--gitea-url` | `GITEA_URL` |
-| `--repo` | `GITEA_REPO` |
-| `--pr` | `PR_NUMBER` |
-| `--reviewer-name` | `REVIEWER_NAME` |
-| `--reviewer-token` | `REVIEWER_TOKEN` |
-| `--llm-base-url` | `LLM_BASE_URL` |
-| `--llm-api-key` | `LLM_API_KEY` |
-| `--llm-model` | `LLM_MODEL` |
-| `--conventions-file` | `CONVENTIONS_FILE` |
+All flags can be set via environment variables:
 
-Use `--dry-run` to print the review to stdout without posting.
+| Flag | Env Var | Required | Description |
+|------|---------|----------|-------------|
+| `--gitea-url` | `GITEA_URL` | Yes | Gitea instance base URL |
+| `--repo` | `GITEA_REPO` | Yes | Repository in `owner/name` format |
+| `--pr` | `PR_NUMBER` | Yes | Pull request number |
+| `--reviewer-token` | `REVIEWER_TOKEN` | Yes | Gitea API token for posting reviews |
+| `--llm-base-url` | `LLM_BASE_URL` | Yes | OpenAI-compatible API base URL |
+| `--llm-api-key` | `LLM_API_KEY` | Yes | LLM API key |
+| `--llm-model` | `LLM_MODEL` | Yes | Model identifier |
+| `--reviewer-name` | `REVIEWER_NAME` | No | Display name in review footer |
+| `--conventions-file` | `CONVENTIONS_FILE` | No | Path to conventions file in repo |
+| `--dry-run` | — | No | Print review to stdout instead of posting |
 
-## Build
+## Adding to a Gitea Repository
+
+1. Build the binary or use the CI workflow approach (build in CI).
+
+2. Add secrets to your Gitea repo (Settings → Actions → Secrets):
+   - `SONNET_REVIEW_TOKEN` — Gitea token for the Sonnet reviewer account
+   - `GPT_REVIEW_TOKEN` — Gitea token for the GPT reviewer account
+   - `LLM_BASE_URL` — Your LLM API endpoint
+   - `LLM_API_KEY` — Your LLM API key
+
+3. Copy `.gitea/workflows/ci.yml` to your repo (or adapt it).
+
+4. On every PR, the bot will:
+   - Run tests and vet
+   - Build review-bot
+   - Post reviews from each configured LLM reviewer
+
+## Development
 
 ```bash
+# Run tests
+go test ./...
+
+# Run vet
+go vet ./...
+
+# Build
 go build -o review-bot ./cmd/review-bot
+
+# Integration tests (requires env vars)
+go test -tags=integration ./...
 ```
 
 ## Architecture
 
-- `cmd/review-bot/main.go` — CLI entry point
-- `gitea/client.go` — Gitea API interactions (fetch PR, diff, CI status, post review)
-- `llm/client.go` — OpenAI-compatible chat completion client
-- `review/prompt.go` — System/user prompt construction
-- `review/parser.go` — Parse LLM JSON response
-- `review/formatter.go` — Format markdown review body
+```
+cmd/review-bot/     CLI entrypoint
+gitea/              Gitea API client
+llm/                OpenAI-compatible LLM client
+review/             Prompt building, response parsing, formatting
+```
 
-## Constraints
+## License
 
-- Pure Go stdlib, no external dependencies
-- No CGO
+MIT

gitea/client_test.go

@@ -0,0 +1,195 @@
+package gitea
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestGetPullRequest(t *testing.T) {
+	pr := PullRequest{
+		Title: "Add feature X",
+		Body:  "This adds feature X.",
+	}
+	pr.Head.Sha = "abc123"
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/repos/owner/repo/pulls/1" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Header.Get("Authorization") != "token test-token" {
+			t.Errorf("unexpected auth header: %s", r.Header.Get("Authorization"))
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(pr)
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	got, err := client.GetPullRequest("owner", "repo", 1)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got.Title != "Add feature X" {
+		t.Errorf("expected title %q, got %q", "Add feature X", got.Title)
+	}
+	if got.Body != "This adds feature X." {
+		t.Errorf("expected body %q, got %q", "This adds feature X.", got.Body)
+	}
+	if got.Head.Sha != "abc123" {
+		t.Errorf("expected sha %q, got %q", "abc123", got.Head.Sha)
+	}
+}
+
+func TestGetPullRequestDiff(t *testing.T) {
+	expectedDiff := "diff --git a/file.go b/file.go\n--- a/file.go\n+++ b/file.go\n@@ -1 +1 @@\n-old\n+new\n"
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/repos/owner/repo/pulls/5.diff" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		w.Write([]byte(expectedDiff))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	got, err := client.GetPullRequestDiff("owner", "repo", 5)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != expectedDiff {
+		t.Errorf("expected diff %q, got %q", expectedDiff, got)
+	}
+}
+
+func TestGetCommitStatuses(t *testing.T) {
+	statuses := []CommitStatus{
+		{Status: "success", Context: "ci/test", Description: "All tests passed"},
+		{Status: "failure", Context: "ci/lint", Description: "Lint failed"},
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/repos/owner/repo/commits/abc123/statuses" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(statuses)
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	got, err := client.GetCommitStatuses("owner", "repo", "abc123")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("expected 2 statuses, got %d", len(got))
+	}
+	if got[0].Status != "success" {
+		t.Errorf("expected first status %q, got %q", "success", got[0].Status)
+	}
+	if got[1].Status != "failure" {
+		t.Errorf("expected second status %q, got %q", "failure", got[1].Status)
+	}
+}
+
+func TestPostReview(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "POST" {
+			t.Errorf("expected POST, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/owner/repo/pulls/3/reviews" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Header.Get("Content-Type") != "application/json" {
+			t.Errorf("unexpected content type: %s", r.Header.Get("Content-Type"))
+		}
+
+		var payload struct {
+			Body  string `json:"body"`
+			Event string `json:"event"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
+			t.Fatalf("failed to decode payload: %v", err)
+		}
+		if payload.Body != "LGTM" {
+			t.Errorf("expected body %q, got %q", "LGTM", payload.Body)
+		}
+		if payload.Event != "APPROVED" {
+			t.Errorf("expected event %q, got %q", "APPROVED", payload.Event)
+		}
+
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	err := client.PostReview("owner", "repo", 3, "APPROVED", "LGTM")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestGetPullRequest_Non200(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+		w.Write([]byte(`{"message":"not found"}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	_, err := client.GetPullRequest("owner", "repo", 999)
+	if err == nil {
+		t.Fatal("expected error for 404, got nil")
+	}
+}
+
+func TestGetPullRequest_BadJSON(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`not json`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	_, err := client.GetPullRequest("owner", "repo", 1)
+	if err == nil {
+		t.Fatal("expected error for bad JSON, got nil")
+	}
+}
+
+func TestPostReview_Non200(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusForbidden)
+		w.Write([]byte(`{"message":"forbidden"}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	err := client.PostReview("owner", "repo", 1, "APPROVED", "test")
+	if err == nil {
+		t.Fatal("expected error for 403, got nil")
+	}
+}
+
+func TestGetFileContent(t *testing.T) {
+	expected := "# Conventions\n- Be nice\n"
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/repos/owner/repo/raw/CONVENTIONS.md" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		w.Write([]byte(expected))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	got, err := client.GetFileContent("owner", "repo", "CONVENTIONS.md")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != expected {
+		t.Errorf("expected %q, got %q", expected, got)
+	}
+}

integration_test.go

@@ -0,0 +1,103 @@
+//go:build integration
+
+package main
+
+import (
+	"os"
+	"strconv"
+	"testing"
+
+	"gitea.weiker.me/rodin/review-bot/gitea"
+	"gitea.weiker.me/rodin/review-bot/llm"
+	"gitea.weiker.me/rodin/review-bot/review"
+)
+
+// Integration test requires a running Gitea instance and LLM endpoint.
+// Set environment variables:
+//   INTEGRATION_GITEA_URL     - Gitea base URL
+//   INTEGRATION_GITEA_TOKEN   - Gitea API token with repo access
+//   INTEGRATION_GITEA_REPO    - owner/repo with an open PR
+//   INTEGRATION_PR_NUMBER     - PR number to test against
+//   INTEGRATION_LLM_BASE_URL  - LLM API base URL
+//   INTEGRATION_LLM_API_KEY   - LLM API key
+//   INTEGRATION_LLM_MODEL     - Model name
+
+func TestIntegration_FullReviewFlow(t *testing.T) {
+	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
+	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
+	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")
+	llmBaseURL := os.Getenv("INTEGRATION_LLM_BASE_URL")
+	llmAPIKey := os.Getenv("INTEGRATION_LLM_API_KEY")
+	llmModel := os.Getenv("INTEGRATION_LLM_MODEL")
+
+	if giteaURL == "" || giteaToken == "" || giteaRepo == "" || prNumStr == "" ||
+		llmBaseURL == "" || llmAPIKey == "" || llmModel == "" {
+		t.Skip("Integration test env vars not set, skipping")
+	}
+
+	prNumber, err := strconv.Atoi(prNumStr)
+	if err != nil {
+		t.Fatalf("Invalid PR number %q: %v", prNumStr, err)
+	}
+
+	// Parse owner/repo
+	owner, repoName := "", ""
+	for i, c := range giteaRepo {
+		if c == / {
+			owner = giteaRepo[:i]
+			repoName = giteaRepo[i+1:]
+			break
+		}
+	}
+	if owner == "" || repoName == "" {
+		t.Fatalf("Invalid repo format %q", giteaRepo)
+	}
+
+	// Step 1: Fetch PR
+	giteaClient := gitea.NewClient(giteaURL, giteaToken)
+	pr, err := giteaClient.GetPullRequest(owner, repoName, prNumber)
+	if err != nil {
+		t.Fatalf("GetPullRequest: %v", err)
+	}
+	t.Logf("PR: %s (sha: %s)", pr.Title, pr.Head.Sha)
+
+	// Step 2: Fetch diff
+	diff, err := giteaClient.GetPullRequestDiff(owner, repoName, prNumber)
+	if err != nil {
+		t.Fatalf("GetPullRequestDiff: %v", err)
+	}
+	if diff == "" {
+		t.Fatal("diff is empty")
+	}
+	t.Logf("Diff size: %d bytes", len(diff))
+
+	// Step 3: Build prompts
+	systemPrompt := review.BuildSystemPrompt("")
+	userPrompt := review.BuildUserPrompt(pr.Title, pr.Body, diff, true, "")
+
+	// Step 4: Call LLM
+	llmClient := llm.NewClient(llmBaseURL, llmAPIKey, llmModel)
+	response, err := llmClient.Complete([]llm.Message{
+		{Role: "system", Content: systemPrompt},
+		{Role: "user", Content: userPrompt},
+	})
+	if err != nil {
+		t.Fatalf("LLM Complete: %v", err)
+	}
+	t.Logf("LLM response: %d bytes", len(response))
+
+	// Step 5: Parse response
+	result, err := review.ParseResponse(response)
+	if err != nil {
+		t.Fatalf("ParseResponse: %v", err)
+	}
+	t.Logf("Verdict: %s, Findings: %d", result.Verdict, len(result.Findings))
+
+	// Step 6: Format (dry-run validation)
+	body := review.FormatMarkdown(result, "integration-test")
+	if body == "" {
+		t.Fatal("formatted review body is empty")
+	}
+	t.Logf("Review body:\n%s", body)
+}

llm/client_test.go

@@ -0,0 +1,110 @@
+package llm
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestComplete_Success(t *testing.T) {
+	resp := ChatResponse{
+		Choices: []struct {
+			Message struct {
+				Content string `json:"content"`
+			} `json:"message"`
+		}{
+			{Message: struct {
+				Content string `json:"content"`
+			}{Content: "Hello, world!"}},
+		},
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/chat/completions" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Method != "POST" {
+			t.Errorf("expected POST, got %s", r.Method)
+		}
+		if r.Header.Get("Authorization") != "Bearer test-key" {
+			t.Errorf("unexpected auth: %s", r.Header.Get("Authorization"))
+		}
+		if r.Header.Get("Content-Type") != "application/json" {
+			t.Errorf("unexpected content type: %s", r.Header.Get("Content-Type"))
+		}
+
+		var req ChatRequest
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			t.Fatalf("decode request: %v", err)
+		}
+		if req.Model != "gpt-4" {
+			t.Errorf("expected model %q, got %q", "gpt-4", req.Model)
+		}
+		if len(req.Messages) != 1 {
+			t.Errorf("expected 1 message, got %d", len(req.Messages))
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(resp)
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-key", "gpt-4")
+	got, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "Hello, world!" {
+		t.Errorf("expected %q, got %q", "Hello, world!", got)
+	}
+}
+
+func TestComplete_APIError(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusTooManyRequests)
+		w.Write([]byte(`{"error":"rate limited"}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-key", "gpt-4")
+	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	if err == nil {
+		t.Fatal("expected error for 429, got nil")
+	}
+}
+
+func TestComplete_NoChoices(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.Write([]byte(`{"choices":[]}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-key", "gpt-4")
+	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	if err == nil {
+		t.Fatal("expected error for no choices, got nil")
+	}
+}
+
+func TestComplete_BadJSON(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`not json at all`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-key", "gpt-4")
+	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	if err == nil {
+		t.Fatal("expected error for bad JSON, got nil")
+	}
+}
+
+func TestComplete_ServerDown(t *testing.T) {
+	client := NewClient("http://127.0.0.1:1", "test-key", "gpt-4")
+	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	if err == nil {
+		t.Fatal("expected error for connection refused, got nil")
+	}
+}

review/formatter_test.go

@@ -0,0 +1,118 @@
+package review
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestFormatMarkdown_EmptyFindings(t *testing.T) {
+	result := &ReviewResult{
+		Verdict:        "APPROVE",
+		Summary:        "All good, no issues.",
+		Findings:       []Finding{},
+		Recommendation: "Merge this PR.",
+	}
+
+	got := FormatMarkdown(result, "Sonnet")
+
+	if !strings.Contains(got, "## Summary") {
+		t.Error("expected Summary header")
+	}
+	if !strings.Contains(got, "All good, no issues.") {
+		t.Error("expected summary text")
+	}
+	if strings.Contains(got, "## Findings") {
+		t.Error("should not contain Findings header when empty")
+	}
+	if !strings.Contains(got, "**APPROVE**") {
+		t.Error("expected verdict in recommendation")
+	}
+	if !strings.Contains(got, "Review by Sonnet") {
+		t.Error("expected reviewer name")
+	}
+}
+
+func TestFormatMarkdown_MultipleFindings(t *testing.T) {
+	result := &ReviewResult{
+		Verdict: "REQUEST_CHANGES",
+		Summary: "Several issues found.",
+		Findings: []Finding{
+			{Severity: "MAJOR", File: "main.go", Line: 42, Finding: "Nil pointer dereference"},
+			{Severity: "MINOR", File: "util.go", Line: 7, Finding: "Unused variable"},
+			{Severity: "NIT", File: "doc.go", Line: 1, Finding: "Typo in comment"},
+		},
+		Recommendation: "Fix the nil pointer issue before merging.",
+	}
+
+	got := FormatMarkdown(result, "GPT")
+
+	if !strings.Contains(got, "## Findings") {
+		t.Error("expected Findings header")
+	}
+	if !strings.Contains(got, "| 1 | [MAJOR] | `main.go` | 42 | Nil pointer dereference |") {
+		t.Error("expected first finding row")
+	}
+	if !strings.Contains(got, "| 2 | [MINOR] | `util.go` | 7 | Unused variable |") {
+		t.Error("expected second finding row")
+	}
+	if !strings.Contains(got, "| 3 | [NIT] | `doc.go` | 1 | Typo in comment |") {
+		t.Error("expected third finding row")
+	}
+	if !strings.Contains(got, "**REQUEST_CHANGES**") {
+		t.Error("expected verdict in recommendation")
+	}
+}
+
+func TestFormatMarkdown_NoReviewerName(t *testing.T) {
+	result := &ReviewResult{
+		Verdict:        "APPROVE",
+		Summary:        "Fine.",
+		Findings:       []Finding{},
+		Recommendation: "Go ahead.",
+	}
+
+	got := FormatMarkdown(result, "")
+	if strings.Contains(got, "Review by") {
+		t.Error("should not contain reviewer line when name is empty")
+	}
+}
+
+func TestFormatMarkdown_SpecialChars(t *testing.T) {
+	result := &ReviewResult{
+		Verdict: "REQUEST_CHANGES",
+		Summary: "Issues with `fmt.Sprintf` usage.",
+		Findings: []Finding{
+			{Severity: "MAJOR", File: "render.go", Line: 15, Finding: "Use `%v` instead of `%s` for interface{}"},
+		},
+		Recommendation: "Fix the format verb.",
+	}
+
+	got := FormatMarkdown(result, "Test")
+
+	// Should contain the backtick content without breaking the table
+	if !strings.Contains(got, "`render.go`") {
+		t.Error("expected file in backticks")
+	}
+	if !strings.Contains(got, "Use `%v` instead of `%s` for interface{}") {
+		t.Error("expected finding text with backticks preserved")
+	}
+}
+
+func TestGiteaEvent(t *testing.T) {
+	tests := []struct {
+		verdict  string
+		expected string
+	}{
+		{"APPROVE", "APPROVED"},
+		{"REQUEST_CHANGES", "REQUEST_CHANGES"},
+		{"UNKNOWN", "COMMENT"},
+		{"", "COMMENT"},
+	}
+
+	for _, tc := range tests {
+		got := GiteaEvent(tc.verdict)
+		if got != tc.expected {
+			t.Errorf("GiteaEvent(%q) = %q, want %q", tc.verdict, got, tc.expected)
+		}
+	}
+}

review/parser_test.go

@@ -0,0 +1,114 @@
+package review
+
+import (
+	"testing"
+)
+
+func TestParseResponse_ValidJSON(t *testing.T) {
+	input := `{
+		"verdict": "APPROVE",
+		"summary": "Looks good",
+		"findings": [
+			{"severity": "NIT", "file": "main.go", "line": 10, "finding": "Consider renaming"}
+		],
+		"recommendation": "Ship it"
+	}`
+
+	result, err := ParseResponse(input)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result.Verdict != "APPROVE" {
+		t.Errorf("expected verdict APPROVE, got %q", result.Verdict)
+	}
+	if result.Summary != "Looks good" {
+		t.Errorf("expected summary %q, got %q", "Looks good", result.Summary)
+	}
+	if len(result.Findings) != 1 {
+		t.Fatalf("expected 1 finding, got %d", len(result.Findings))
+	}
+	if result.Findings[0].Severity != "NIT" {
+		t.Errorf("expected severity NIT, got %q", result.Findings[0].Severity)
+	}
+	if result.Findings[0].File != "main.go" {
+		t.Errorf("expected file main.go, got %q", result.Findings[0].File)
+	}
+	if result.Findings[0].Line != 10 {
+		t.Errorf("expected line 10, got %d", result.Findings[0].Line)
+	}
+	if result.Recommendation != "Ship it" {
+		t.Errorf("expected recommendation %q, got %q", "Ship it", result.Recommendation)
+	}
+}
+
+func TestParseResponse_MarkdownFences(t *testing.T) {
+	input := "```json\n{\"verdict\": \"REQUEST_CHANGES\", \"summary\": \"Issues found\", \"findings\": [{\"severity\": \"MAJOR\", \"file\": \"a.go\", \"line\": 5, \"finding\": \"Bug\"}], \"recommendation\": \"Fix it\"}\n```"
+
+	result, err := ParseResponse(input)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result.Verdict != "REQUEST_CHANGES" {
+		t.Errorf("expected verdict REQUEST_CHANGES, got %q", result.Verdict)
+	}
+	if len(result.Findings) != 1 {
+		t.Fatalf("expected 1 finding, got %d", len(result.Findings))
+	}
+	if result.Findings[0].Severity != "MAJOR" {
+		t.Errorf("expected severity MAJOR, got %q", result.Findings[0].Severity)
+	}
+}
+
+func TestParseResponse_InvalidJSON(t *testing.T) {
+	_, err := ParseResponse("this is not json")
+	if err == nil {
+		t.Fatal("expected error for invalid JSON, got nil")
+	}
+}
+
+func TestParseResponse_InvalidVerdict(t *testing.T) {
+	input := `{"verdict": "MAYBE", "summary": "Hmm", "findings": [], "recommendation": "Dunno"}`
+	_, err := ParseResponse(input)
+	if err == nil {
+		t.Fatal("expected error for invalid verdict, got nil")
+	}
+}
+
+func TestParseResponse_InvalidSeverity(t *testing.T) {
+	input := `{"verdict": "APPROVE", "summary": "Ok", "findings": [{"severity": "CRITICAL", "file": "x.go", "line": 1, "finding": "bad"}], "recommendation": "Fix"}`
+	_, err := ParseResponse(input)
+	if err == nil {
+		t.Fatal("expected error for invalid severity, got nil")
+	}
+}
+
+func TestParseResponse_EmptyFindings(t *testing.T) {
+	input := `{"verdict": "APPROVE", "summary": "All good", "findings": [], "recommendation": "Merge"}`
+	result, err := ParseResponse(input)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(result.Findings) != 0 {
+		t.Errorf("expected 0 findings, got %d", len(result.Findings))
+	}
+}
+
+func TestParseResponse_MissingFields(t *testing.T) {
+	// verdict is empty string — should fail validation
+	input := `{"summary": "Ok", "findings": [], "recommendation": "Merge"}`
+	_, err := ParseResponse(input)
+	if err == nil {
+		t.Fatal("expected error for missing verdict, got nil")
+	}
+}
+
+func TestParseResponse_MarkdownFencesNoLang(t *testing.T) {
+	input := "```\n{\"verdict\": \"APPROVE\", \"summary\": \"Fine\", \"findings\": [], \"recommendation\": \"Good\"}\n```"
+	result, err := ParseResponse(input)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result.Verdict != "APPROVE" {
+		t.Errorf("expected APPROVE, got %q", result.Verdict)
+	}
+}

review/prompt_test.go

@@ -0,0 +1,77 @@
+package review
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestBuildSystemPrompt_NoConventions(t *testing.T) {
+	prompt := BuildSystemPrompt("")
+
+	if !strings.Contains(prompt, "expert code reviewer") {
+		t.Error("expected system prompt to mention code reviewer role")
+	}
+	if strings.Contains(prompt, "coding conventions") {
+		t.Error("should not mention conventions when empty")
+	}
+}
+
+func TestBuildSystemPrompt_WithConventions(t *testing.T) {
+	conventions := "- Use stdlib only\n- No panics\n"
+	prompt := BuildSystemPrompt(conventions)
+
+	if !strings.Contains(prompt, "coding conventions") {
+		t.Error("expected conventions section")
+	}
+	if !strings.Contains(prompt, "Use stdlib only") {
+		t.Error("expected conventions content")
+	}
+}
+
+func TestBuildUserPrompt_Basic(t *testing.T) {
+	prompt := BuildUserPrompt("Fix bug", "Fixes the crash", "diff content here", true, "all checks passed")
+
+	if !strings.Contains(prompt, "Fix bug") {
+		t.Error("expected PR title")
+	}
+	if !strings.Contains(prompt, "Fixes the crash") {
+		t.Error("expected PR description")
+	}
+	if !strings.Contains(prompt, "diff content here") {
+		t.Error("expected diff content")
+	}
+	if !strings.Contains(prompt, "PASSED") {
+		t.Error("expected CI status PASSED")
+	}
+}
+
+func TestBuildUserPrompt_CIFailed(t *testing.T) {
+	prompt := BuildUserPrompt("Add tests", "", "some diff", false, "lint: failed")
+
+	if !strings.Contains(prompt, "FAILED") {
+		t.Error("expected CI status FAILED")
+	}
+	if !strings.Contains(prompt, "lint: failed") {
+		t.Error("expected CI details")
+	}
+}
+
+func TestBuildUserPrompt_NoDescription(t *testing.T) {
+	prompt := BuildUserPrompt("Quick fix", "", "diff", true, "")
+
+	if strings.Contains(prompt, "### Description") {
+		t.Error("should not contain Description header when body is empty")
+	}
+}
+
+func TestBuildUserPrompt_DiffIncluded(t *testing.T) {
+	diff := "+func Hello() string {\n+\treturn \"hello\"\n+}"
+	prompt := BuildUserPrompt("Greeting", "Add greeting func", diff, true, "")
+
+	if !strings.Contains(prompt, "```diff") {
+		t.Error("expected diff fence")
+	}
+	if !strings.Contains(prompt, diff) {
+		t.Error("expected diff content in prompt")
+	}
+}