Coverage priorities 1-5: test pure functions, extract interfaces, mock-based handler tests

- Priority 1: Test NewSendEmailTask + NewSendPushTask (5 tests)
- Priority 2: Test customHTTPErrorHandler — all 15+ branches (21 tests)
- Priority 3: Extract Enqueuer interface + payload builders in worker pkg (5 tests)
- Priority 4: Extract ClassifyFile/ComputeRelPath in migrate-encrypt (6 tests)
- Priority 5: Define Handler interfaces, refactor to accept them, mock-based tests (14 tests)
- Fix .gitignore: /worker instead of worker to stop ignoring internal/worker/

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/utils/logger_test.go

@@ -0,0 +1,123 @@
+package utils
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/labstack/echo/v4"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInitLogger_Debug(t *testing.T) {
+	InitLogger(true)
+	assert.Equal(t, zerolog.DebugLevel, zerolog.GlobalLevel())
+}
+
+func TestInitLogger_Production(t *testing.T) {
+	InitLogger(false)
+	assert.Equal(t, zerolog.InfoLevel, zerolog.GlobalLevel())
+}
+
+func TestInitLoggerWithWriter_AdditionalWriter(t *testing.T) {
+	var buf bytes.Buffer
+	InitLoggerWithWriter(false, &buf)
+
+	log.Info().Msg("test message")
+
+	// The additional writer should have received JSON output
+	assert.Contains(t, buf.String(), "test message")
+}
+
+func TestInitLoggerWithWriter_Debug_AdditionalWriter(t *testing.T) {
+	var buf bytes.Buffer
+	InitLoggerWithWriter(true, &buf)
+
+	log.Info().Msg("debug test")
+
+	// Additional writer receives JSON even in debug mode
+	assert.Contains(t, buf.String(), "debug test")
+}
+
+func TestInitLoggerWithWriter_NilWriter(t *testing.T) {
+	// Should not panic with nil additional writer
+	InitLoggerWithWriter(false, nil)
+	assert.Equal(t, zerolog.InfoLevel, zerolog.GlobalLevel())
+}
+
+func TestEchoLogger_ReturnsMiddleware(t *testing.T) {
+	mw := EchoLogger()
+	assert.NotNil(t, mw)
+
+	// Test that it processes requests without error
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/api/health/", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	handler := mw(func(c echo.Context) error {
+		return c.String(http.StatusOK, "ok")
+	})
+
+	err := handler(c)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusOK, rec.Code)
+}
+
+func TestEchoRecovery_ReturnsMiddleware(t *testing.T) {
+	mw := EchoRecovery()
+	assert.NotNil(t, mw)
+
+	// Test panic recovery
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/api/panic/", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	handler := mw(func(c echo.Context) error {
+		panic("test panic")
+	})
+
+	// Should not panic — the middleware recovers
+	assert.NotPanics(t, func() {
+		_ = handler(c)
+	})
+	assert.Equal(t, http.StatusInternalServerError, rec.Code)
+	assert.Contains(t, rec.Body.String(), "Internal server error")
+}
+
+func TestEchoLogger_WithQueryParams(t *testing.T) {
+	mw := EchoLogger()
+
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/api/tasks/?limit=10&offset=0", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	handler := mw(func(c echo.Context) error {
+		return c.String(http.StatusOK, "ok")
+	})
+
+	err := handler(c)
+	assert.NoError(t, err)
+}
+
+func TestEchoLogger_ErrorStatus(t *testing.T) {
+	mw := EchoLogger()
+
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/api/notfound/", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	handler := mw(func(c echo.Context) error {
+		return c.String(http.StatusNotFound, "not found")
+	})
+
+	err := handler(c)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusNotFound, rec.Code)
+}