refactor: introduce clock to make tests reproducible

internal/service/settings_service.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/wotra/wotra/internal/clock"
 	"github.com/wotra/wotra/internal/domain"
 	"github.com/wotra/wotra/internal/store"
 )
@@ -24,15 +25,16 @@ var (
 type SettingsService struct {
 	store     *store.SettingsStore
 	syncStore *store.SyncStore
+	clock     clock.Clock
 }
 
-func NewSettingsService(s *store.SettingsStore, syncStore *store.SyncStore) *SettingsService {
-	return &SettingsService{store: s, syncStore: syncStore}
+func NewSettingsService(s *store.SettingsStore, syncStore *store.SyncStore, clk clock.Clock) *SettingsService {
+	return &SettingsService{store: s, syncStore: syncStore, clock: clk}
 }
 
 // Current returns settings effective as of today.
 func (s *SettingsService) Current(ctx context.Context) (*domain.Settings, error) {
-	today := time.Now().UTC().Format("2006-01-02")
+	today := s.clock.Now().UTC().Format("2006-01-02")
 	set, err := s.store.Current(ctx, today)
 	if err != nil {
 		return nil, ErrNoSettings
@@ -80,7 +82,7 @@ func (s *SettingsService) Upsert(ctx context.Context, input UpsertSettingsInput)
 		return nil, fmt.Errorf("invalid effective_from: %w", err)
 	}
 
-	now := time.Now().UnixMilli()
+	now := s.clock.Now().UnixMilli()
 	set := &domain.Settings{
 		ID:            uuid.New().String(),
 		EffectiveFrom: input.EffectiveFrom,
@@ -135,7 +137,7 @@ func (s *SettingsService) UpdateSettings(ctx context.Context, id string, input U
 	set.HoursPerWeek = input.HoursPerWeek
 	set.WorkdaysMask = input.WorkdaysMask
 	set.Timezone = input.Timezone
-	set.UpdatedAt = time.Now().UnixMilli()
+	set.UpdatedAt = s.clock.Now().UnixMilli()
 
 	if err := s.store.Update(ctx, set); err != nil {
 		return nil, err