Add linting, formatting, and test infrastructure for Phase 1

- Add .golangci.yml with sensible linting rules
- Add Makefile with test, lint, fmt, vet, build targets
- Enhance CI pipeline with Go formatting check and golangci-lint job
- Create shared testutil.FakeRepository for handler tests
- Refactor handler tests to use shared FakeRepository
- Add data/ and coverage.out to .gitignore

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -17,6 +17,14 @@ jobs:
           go-version: '1.25'
           cache: true
 
+      - name: Check formatting
+        run: |
+          if [ -n "$(gofmt -l .)" ]; then
+            echo "Files not formatted:"
+            gofmt -l .
+            exit 1
+          fi
+
       - name: Vet
         run: go vet ./...
 
@@ -41,6 +49,21 @@ jobs:
           curl -fsS http://localhost:8080/healthz | grep -q 'ok'
           docker stop hatch-ci
 
+  lint-go:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.25'
+          cache: true
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: latest
+
   lint-docs:
     runs-on: ubuntu-latest
     steps:

.gitignore

@@ -12,6 +12,11 @@ go.work
 /bin
 /dist
 
+# Runtime data
+data/
+*.db
+coverage.out
+
 # IDE
 .idea/
 .vscode/

.golangci.yml

@@ -0,0 +1,57 @@
+linters:
+  enable:
+    - errcheck
+    - gosimple
+    - govet
+    - ineffassign
+    - staticcheck
+    - unused
+    - gofmt
+    - misspell
+    - unconvert
+    - unparam
+    - prealloc
+    - gocritic
+    - revive
+
+linters-settings:
+  errcheck:
+    check-type-assertions: true
+    check-blank: true
+  govet:
+    check-shadowing: true
+  revive:
+    rules:
+      - name: blank-imports
+      - name: context-as-argument
+      - name: dot-imports
+      - name: error-return
+      - name: error-strings
+      - name: error-naming
+      - name: exported
+      - name: if-return
+      - name: increment-decrement
+      - name: var-naming
+      - name: var-declaration
+      - name: range
+      - name: receiver-naming
+      - name: indent-error-flow
+      - name: superfluous-else
+      - name: unreachable-code
+      - name: redefines-builtin-id
+
+issues:
+  exclude-rules:
+    # Exclude some linters from running on test files
+    - path: _test\.go
+      linters:
+        - errcheck
+        - gocritic
+        - unparam
+    # Exclude known issues in test files
+    - path: _test\.go
+      text: "func name"
+
+run:
+  timeout: 5m
+  modules-download-mode: readonly

Makefile

@@ -0,0 +1,35 @@
+.PHONY: all build test lint fmt vet clean help
+
+all: lint test build
+
+## build: Build the hatch binary
+build:
+	CGO_ENABLED=0 go build -o hatch ./cmd/hatch
+
+## test: Run all tests with race detection and coverage
+test:
+	go test ./... -v -race -coverprofile=coverage.out
+
+## lint: Run golangci-lint
+lint:
+	golangci-lint run ./...
+
+## fmt: Format code with gofmt and goimports
+fmt:
+	gofmt -s -w .
+	goimports -w .
+
+## vet: Run go vet
+vet:
+	go vet ./...
+
+## clean: Remove build artifacts
+clean:
+	rm -f hatch coverage.out
+
+## help: Show this help message
+help:
+	@echo "Usage: make [target]"
+	@echo ""
+	@echo "Targets:"
+	@grep -E '^## ' $(MAKEFILE_LIST) | sed 's/## /  /'

internal/handler/api_v1_test.go

@@ -8,10 +8,11 @@ import (
 	"testing"
 
 	"github.com/elfoundation/hatch/internal/store"
+	"github.com/elfoundation/hatch/internal/testutil"
 )
 
 func TestV1CaptureRequest(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	r := testRouter(repo)
 
 	body := `{"method":"POST","path":"/test","headers":{"X-Custom":"value"},"query":"foo=bar","body":"hello"}`
@@ -35,16 +36,16 @@ func TestV1CaptureRequest(t *testing.T) {
 		t.Errorf("expected path /test, got %v", resp["path"])
 	}
 	// Verify request stored in repo.
-	if len(repo.requests) != 1 {
-		t.Fatalf("expected 1 request stored, got %d", len(repo.requests))
+	if len(repo.Requests) != 1 {
+		t.Fatalf("expected 1 request stored, got %d", len(repo.Requests))
 	}
-	if repo.requests[0].Headers != `{"X-Custom":"value"}` {
-		t.Errorf("expected headers JSON, got %q", repo.requests[0].Headers)
+	if repo.Requests[0].Headers != `{"X-Custom":"value"}` {
+		t.Errorf("expected headers JSON, got %q", repo.Requests[0].Headers)
 	}
 }
 
 func TestV1ListRequests(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "list-ep")
 	// Add a few requests.
 	repo.AppendRequest(nil, "list-ep", &store.Request{Method: "GET", Path: "/a"})
@@ -77,7 +78,7 @@ func TestV1ListRequests(t *testing.T) {
 }
 
 func TestV1SearchRequests(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "search-ep")
 	repo.AppendRequest(nil, "search-ep", &store.Request{Method: "GET", Path: "/users", Headers: `{"Accept":"json"}`})
 	repo.AppendRequest(nil, "search-ep", &store.Request{Method: "POST", Path: "/orders", Body: []byte(`{"item":"apple"}`)})
@@ -111,7 +112,7 @@ func TestV1SearchRequests(t *testing.T) {
 }
 
 func TestV1MockSet(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "mock-ep")
 	r := testRouter(repo)
 
@@ -138,7 +139,7 @@ func TestV1MockSet(t *testing.T) {
 }
 
 func TestV1OpenAPI(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	r := testRouter(repo)
 	req := httptest.NewRequest(http.MethodGet, "/v1/endpoints/test/openapi.json", nil)
 	w := httptest.NewRecorder()

internal/handler/handler_test.go

@@ -11,89 +11,10 @@ import (
 	"time"
 
 	"github.com/elfoundation/hatch/internal/store"
+	"github.com/elfoundation/hatch/internal/testutil"
 	"github.com/go-chi/chi/v5"
 )
 
-// fakeRepo implements store.Repository for tests.
-type fakeRepo struct {
-	endpoints map[string]*store.Endpoint
-	requests  []*store.Request
-	mocks     map[string]*store.MockConfig
-}
-
-func newFakeRepo() *fakeRepo {
-	return &fakeRepo{
-		endpoints: map[string]*store.Endpoint{},
-		mocks:     map[string]*store.MockConfig{},
-	}
-}
-
-func (f *fakeRepo) CreateEndpoint(_ context.Context, u string) (*store.Endpoint, error) {
-	e := &store.Endpoint{ID: u, URL: u, CreatedAt: "t", UpdatedAt: "t"}
-	f.endpoints[u] = e
-	return e, nil
-}
-func (f *fakeRepo) GetEndpoint(_ context.Context, id string) (*store.Endpoint, error) {
-	e, ok := f.endpoints[id]
-	if !ok {
-		return nil, errNotFound
-	}
-	return e, nil
-}
-func (f *fakeRepo) AppendRequest(_ context.Context, eid string, r *store.Request) error {
-	r.ID = "req-" + string(rune(len(f.requests)+'0'))
-	r.EndpointID = eid
-	f.requests = append(f.requests, r)
-	return nil
-}
-func (f *fakeRepo) GetRequest(_ context.Context, id string) (*store.Request, error) {
-	for _, r := range f.requests {
-		if r.ID == id {
-			return r, nil
-		}
-	}
-	return nil, errNotFound
-}
-func (f *fakeRepo) ListRequests(_ context.Context, _ string, _ int) ([]*store.Request, error) {
-	return f.requests, nil
-}
-func (f *fakeRepo) SearchRequests(_ context.Context, _ string, query string, limit int) ([]*store.Request, error) {
-	if query == "" {
-		return f.requests, nil
-	}
-	var matched []*store.Request
-	for _, r := range f.requests {
-		if strings.Contains(r.Method, query) ||
-			strings.Contains(r.Path, query) ||
-			strings.Contains(r.Headers, query) ||
-			strings.Contains(r.Query, query) ||
-			strings.Contains(string(r.Body), query) {
-			matched = append(matched, r)
-			if limit > 0 && len(matched) >= limit {
-				break
-			}
-		}
-	}
-	return matched, nil
-}
-func (f *fakeRepo) GetMock(_ context.Context, endpointID string) (*store.MockConfig, error) {
-	m, ok := f.mocks[endpointID]
-	if !ok {
-		return nil, errNotFound
-	}
-	return m, nil
-}
-func (f *fakeRepo) SetMock(_ context.Context, mock *store.MockConfig) error {
-	f.mocks[mock.EndpointID] = mock
-	return nil
-}
-func (f *fakeRepo) Close() error { return nil }
-
-var errNotFound = &se{"nf"}
-
-type se struct{ m string }
-
-func (e *se) Error() string { return e.m }
 
 // testRouter creates a chi router with all routes registered using a fake repo.
 func testRouter(repo store.Repository) chi.Router {
@@ -104,7 +25,7 @@ func testRouter(repo store.Repository) chi.Router {
 }
 
 func TestHealthz(t *testing.T) {
-	r := testRouter(newFakeRepo())
+	r := testRouter(testutil.NewFakeRepository())
 	req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
 	w := httptest.NewRecorder()
 	r.ServeHTTP(w, req)
@@ -121,7 +42,7 @@ func TestHealthz(t *testing.T) {
 func TestCaptureRecordsAllVerbs(t *testing.T) {
 	methods := []string{"GET", "POST", "PUT", "PATCH", "DELETE"}
 	for _, m := range methods {
-		repo := newFakeRepo()
+		repo := testutil.NewFakeRepository()
 		r := testRouter(repo)
 
 		body := ""
@@ -138,11 +59,11 @@ func TestCaptureRecordsAllVerbs(t *testing.T) {
 		if w.Code != 200 {
 			t.Errorf("%s: expected 200, got %d", m, w.Code)
 		}
-		if len(repo.requests) != 1 {
-			t.Errorf("%s: expected 1 request, got %d", m, len(repo.requests))
+		if len(repo.Requests) != 1 {
+			t.Errorf("%s: expected 1 request, got %d", m, len(repo.Requests))
 			continue
 		}
-		reqCaptured := repo.requests[0]
+		reqCaptured := repo.Requests[0]
 		if reqCaptured.Method != m {
 			t.Errorf("%s: wrong method %s", m, reqCaptured.Method)
 		}
@@ -150,7 +71,7 @@ func TestCaptureRecordsAllVerbs(t *testing.T) {
 }
 
 func TestSSEStreamReceivesEventOnCapture(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	srv := httptest.NewServer(testRouter(repo))
 	defer srv.Close()
 
@@ -224,7 +145,7 @@ func TestSSEStreamReceivesEventOnCapture(t *testing.T) {
 }
 
 func TestInspectReturnsHTML(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{
 		Method:  "POST",
@@ -290,7 +211,7 @@ func TestInspectReturnsHTML(t *testing.T) {
 }
 
 func TestInspectEmptyState(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "new-ep")
 
 	r := testRouter(repo)
@@ -320,7 +241,7 @@ func TestInspectEmptyState(t *testing.T) {
 }
 
 func TestInspectAutoCreatesEndpoint(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 
 	// The endpoint doesn't exist yet.
 	r := testRouter(repo)
@@ -350,7 +271,7 @@ func TestInspectAutoCreatesEndpoint(t *testing.T) {
 }
 
 func TestCaptureReturnsJSON200(t *testing.T) {
-	r := testRouter(newFakeRepo())
+	r := testRouter(testutil.NewFakeRepository())
 	w := httptest.NewRecorder()
 	r.ServeHTTP(w, httptest.NewRequest("GET", "/t", nil))
 
@@ -369,7 +290,7 @@ func TestCaptureReturnsJSON200(t *testing.T) {
 }
 
 func TestMockSetsAndConfiguresResponse(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "mock-ep")
 
 	r := testRouter(repo)
@@ -399,7 +320,7 @@ func TestMockSetsAndConfiguresResponse(t *testing.T) {
 }
 
 func TestMockReturnsConfiguredResponseOnCapture(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "mock-cap")
 	// Pre-set a mock.
 	repo.SetMock(nil, &store.MockConfig{
@@ -427,16 +348,16 @@ func TestMockReturnsConfiguredResponseOnCapture(t *testing.T) {
 	}
 
 	// Request should still be captured even when mock responds.
-	if len(repo.requests) != 1 {
-		t.Fatalf("expected 1 captured request, got %d", len(repo.requests))
+	if len(repo.Requests) != 1 {
+		t.Fatalf("expected 1 captured request, got %d", len(repo.Requests))
 	}
-	if repo.requests[0].Method != "POST" {
-		t.Errorf("captured method: %s", repo.requests[0].Method)
+	if repo.Requests[0].Method != "POST" {
+		t.Errorf("captured method: %s", repo.Requests[0].Method)
 	}
 }
 
 func TestMockAutoCreatesEndpointOnSet(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	r := testRouter(repo)
 
 	// Set a mock on an endpoint that doesn't exist yet.

internal/handler/replay_test.go

@@ -8,13 +8,14 @@ import (
 	"testing"
 
 	"github.com/elfoundation/hatch/internal/store"
+	"github.com/elfoundation/hatch/internal/testutil"
 )
 
 func TestReplayMissingTargetURL(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{Method: "POST", Path: "/webhook", Headers: "{}"})
-	reqID := repo.requests[0].ID
+	reqID := repo.Requests[0].ID
 
 	r := testRouter(repo)
 	body := `{}`
@@ -34,10 +35,10 @@ func TestReplayMissingTargetURL(t *testing.T) {
 }
 
 func TestReplayInvalidScheme(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{Method: "GET", Path: "/", Headers: "{}"})
-	reqID := repo.requests[0].ID
+	reqID := repo.Requests[0].ID
 
 	r := testRouter(repo)
 	body := `{"target_url": "ftp://bad.scheme/"}`
@@ -52,10 +53,10 @@ func TestReplayInvalidScheme(t *testing.T) {
 }
 
 func TestReplaySSRFBlocksLocalhost(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{Method: "GET", Path: "/", Headers: "{}"})
-	reqID := repo.requests[0].ID
+	reqID := repo.Requests[0].ID
 
 	r := testRouter(repo)
 	body := `{"target_url": "http://localhost:8080/"}`
@@ -70,10 +71,10 @@ func TestReplaySSRFBlocksLocalhost(t *testing.T) {
 }
 
 func TestReplaySSRFBlocksPrivate(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{Method: "GET", Path: "/", Headers: "{}"})
-	reqID := repo.requests[0].ID
+	reqID := repo.Requests[0].ID
 
 	r := testRouter(repo)
 	for _, addr := range []string{
@@ -96,7 +97,7 @@ func TestReplaySSRFBlocksPrivate(t *testing.T) {
 }
 
 func TestReplayNotFound(t *testing.T) {
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	r := testRouter(repo)
 	body := `{"target_url": "https://example.com/"}`
 	req := httptest.NewRequest(http.MethodPost, "/e/ep/requests/nonexistent/replay", strings.NewReader(body))
@@ -118,7 +119,7 @@ func TestReplaySuccess(t *testing.T) {
 	}))
 	defer sink.Close()
 
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	repo.CreateEndpoint(nil, "ep")
 	repo.AppendRequest(nil, "ep", &store.Request{
 		Method:  "POST",
@@ -127,7 +128,7 @@ func TestReplaySuccess(t *testing.T) {
 		Query:   "foo=bar",
 		Body:    []byte(`{"msg":"hello"}`),
 	})
-	reqID := repo.requests[0].ID
+	reqID := repo.Requests[0].ID
 
 	// Set env to allow private replay since httptest server is on loopback.
 	t.Setenv("HATCH_ALLOW_PRIVATE_REPLAY", "true")
@@ -175,7 +176,7 @@ func TestReplayE2ECaptureThenReplay(t *testing.T) {
 	defer sink.Close()
 
 	// Step 2: Capture a request.
-	repo := newFakeRepo()
+	repo := testutil.NewFakeRepository()
 	rt := testRouter(repo)
 
 	captureReq := httptest.NewRequest("POST", "/e2e-test", strings.NewReader(`{"order":"1"}`))
@@ -183,10 +184,10 @@ func TestReplayE2ECaptureThenReplay(t *testing.T) {
 	captureW := httptest.NewRecorder()
 	rt.ServeHTTP(captureW, captureReq)
 
-	if len(repo.requests) != 1 {
-		t.Fatalf("expected 1 captured request, got %d", len(repo.requests))
+	if len(repo.Requests) != 1 {
+		t.Fatalf("expected 1 captured request, got %d", len(repo.Requests))
 	}
-	captured := repo.requests[0]
+	captured := repo.Requests[0]
 	if captured.Method != "POST" {
 		t.Errorf("captured method: %s", captured.Method)
 	}

internal/testutil/fake_repo.go

@@ -0,0 +1,98 @@
+package testutil
+
+import (
+	"context"
+	"strings"
+
+	"github.com/elfoundation/hatch/internal/store"
+)
+
+// FakeRepository implements store.Repository for tests.
+type FakeRepository struct {
+	Endpoints map[string]*store.Endpoint
+	Requests  []*store.Request
+	Mocks     map[string]*store.MockConfig
+}
+
+// NewFakeRepository creates a new FakeRepository.
+func NewFakeRepository() *FakeRepository {
+	return &FakeRepository{
+		Endpoints: map[string]*store.Endpoint{},
+		Mocks:     map[string]*store.MockConfig{},
+	}
+}
+
+func (f *FakeRepository) CreateEndpoint(_ context.Context, url string) (*store.Endpoint, error) {
+	e := &store.Endpoint{ID: url, URL: url, CreatedAt: "t", UpdatedAt: "t"}
+	f.Endpoints[url] = e
+	return e, nil
+}
+
+func (f *FakeRepository) GetEndpoint(_ context.Context, id string) (*store.Endpoint, error) {
+	e, ok := f.Endpoints[id]
+	if !ok {
+		return nil, errNotFound
+	}
+	return e, nil
+}
+
+func (f *FakeRepository) AppendRequest(_ context.Context, eid string, r *store.Request) error {
+	r.ID = "req-" + string(rune(len(f.Requests)+'0'))
+	r.EndpointID = eid
+	f.Requests = append(f.Requests, r)
+	return nil
+}
+
+func (f *FakeRepository) GetRequest(_ context.Context, id string) (*store.Request, error) {
+	for _, r := range f.Requests {
+		if r.ID == id {
+			return r, nil
+		}
+	}
+	return nil, errNotFound
+}
+
+func (f *FakeRepository) ListRequests(_ context.Context, _ string, _ int) ([]*store.Request, error) {
+	return f.Requests, nil
+}
+
+func (f *FakeRepository) SearchRequests(_ context.Context, _ string, query string, limit int) ([]*store.Request, error) {
+	if query == "" {
+		return f.Requests, nil
+	}
+	var matched []*store.Request
+	for _, r := range f.Requests {
+		if strings.Contains(r.Method, query) ||
+			strings.Contains(r.Path, query) ||
+			strings.Contains(r.Headers, query) ||
+			strings.Contains(r.Query, query) ||
+			strings.Contains(string(r.Body), query) {
+			matched = append(matched, r)
+			if limit > 0 && len(matched) >= limit {
+				break
+			}
+		}
+	}
+	return matched, nil
+}
+
+func (f *FakeRepository) GetMock(_ context.Context, endpointID string) (*store.MockConfig, error) {
+	m, ok := f.Mocks[endpointID]
+	if !ok {
+		return nil, errNotFound
+	}
+	return m, nil
+}
+
+func (f *FakeRepository) SetMock(_ context.Context, mock *store.MockConfig) error {
+	f.Mocks[mock.EndpointID] = mock
+	return nil
+}
+
+func (f *FakeRepository) Close() error { return nil }
+
+type notFoundError struct{}
+
+func (e *notFoundError) Error() string { return "not found" }
+
+var errNotFound = &notFoundError{}