Add dependency injection for current time in tests

absences_test.go

@@ -18,7 +18,7 @@ func TestAddAbsence(t *testing.T) {
 	store, err := NewStore(db, zerolog.Nop())
 	require.NoError(t, err)
 
-	now := NextWednesday()
+	now := NextWednesday(nil)
 	assert.NoError(t, store.AddAbsence(context.TODO(), now, "foobarbaz"))
 	absentees, err := store.GetAbsentees(context.TODO(), now)
 	assert.NoError(t, err)
@@ -40,7 +40,7 @@ func TestGetSchedule(t *testing.T) {
 	store, err := NewStore(db, zerolog.Nop())
 	require.NoError(t, err)
 
-	now := NextWednesday()
+	now := NextWednesday(nil)
 
 	_ = store.AddAbsence(context.TODO(), now.Add(7*24*time.Hour), "foobar")
 

cmd/themis-server/main.go

@@ -581,7 +581,7 @@ func main() {
 		},
 		"schedule": func(ctx context.Context, s *discordgo.Session, i *discordgo.InteractionCreate) error {
 			// get schedule from now to 4 wednesdays into the future
-			sched, err := store.GetSchedule(ctx, themis.NextWednesday(), themis.NextWednesday().Add(4*7*24*time.Hour))
+			sched, err := store.GetSchedule(ctx, themis.NextWednesday(nil), themis.NextWednesday(nil).Add(4*7*24*time.Hour))
 			if err != nil {
 				if err := s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 					Type: discordgo.InteractionResponseChannelMessageWithSource,
@@ -643,7 +643,7 @@ func main() {
 		"absent": func(ctx context.Context, s *discordgo.Session, i *discordgo.InteractionCreate) error {
 			var rawDate string
 			if len(i.ApplicationCommandData().Options) == 0 {
-				rawDate = themis.NextWednesday().Format(time.DateOnly)
+				rawDate = themis.NextWednesday(nil).Format(time.DateOnly)
 			} else {
 				rawDate = i.ApplicationCommandData().Options[0].StringValue()
 			}
@@ -739,7 +739,7 @@ func main() {
 		defer span.End()
 
 		log.Info().Msg("sending weekly reminder")
-		absentees, err := store.GetAbsentees(ctx, themis.NextWednesday())
+		absentees, err := store.GetAbsentees(ctx, themis.NextWednesday(nil))
 		if err != nil {
 			log.Error().Err(err).Msg("failed to get absentees for next session")
 			return
@@ -884,7 +884,7 @@ func registerHandlers(sess *discordgo.Session, handlers map[string]Handler) {
 				userId := i.Member.User.ID
 				log.Info().Ctx(ctx).Str("message_component", "schedule-response").Str("userid", userId).Msg("handling message component interaction")
 
-				if err := store.AddAbsence(ctx, themis.NextWednesday(), userId); err != nil {
+				if err := store.AddAbsence(ctx, themis.NextWednesday(nil), userId); err != nil {
 					if err := s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
 						Type: discordgo.InteractionResponseChannelMessageWithSource,
 						Data: &discordgo.InteractionResponseData{

notify.go

@@ -26,7 +26,7 @@ func NewNotifier(c chan context.Context) *Notifier {
 }
 
 func (n *Notifier) Start(ctx context.Context) {
-	m := NextWednesday()
+	m := NextWednesday(nil)
 	sat := m.AddDate(0, 0, -4)
 	if sat.Before(time.Now()) {
 		sat = sat.AddDate(0, 0, 7)

time.go

@@ -2,12 +2,22 @@ package themis
 
 import "time"
 
-var now func() time.Time
+var defaultClock Clock = DefaultClock{}
 
-func init() {
+type Clock interface {
-	now = time.Now
+	Now() time.Time
 }
 
-func NextWednesday() time.Time {
+type DefaultClock struct{}
-	return now().AddDate(0, 0, int((10-now().Weekday())%7))
+
+func (DefaultClock) Now() time.Time {
+	return time.Now()
+}
+
+func NextWednesday(clock Clock) time.Time {
+	if clock == nil {
+		clock = defaultClock
+	}
+	now := clock.Now()
+	return now.AddDate(0, 0, int((10-now.Weekday())%7))
 }

time_test.go

@@ -4,8 +4,18 @@ import (
 	"reflect"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/require"
 )
 
+type TestClock struct {
+	now time.Time
+}
+
+func (c TestClock) Now() time.Time {
+	return c.now
+}
+
 func TestNextWednesday(t *testing.T) {
 	tests := []struct {
 		name string
@@ -14,31 +24,35 @@ func TestNextWednesday(t *testing.T) {
 	}{
 		{
 			name: "on wednesday",
-			seed: "2023-11-13T15:04:05Z07:00",
+			seed: "2023-11-15T15:04:05Z",
-			want: "2023-11-13T15:04:05Z07:00",
+			want: "2023-11-15T15:04:05Z",
 		},
 		{
 			name: "on sunday",
-			seed: "2023-11-12T15:04:05Z07:00",
+			seed: "2023-11-12T15:04:05Z",
-			want: "2023-11-13T15:04:05Z07:00",
+			want: "2023-11-15T15:04:05Z",
 		},
 		{
-			name: "on tuesday",
+			name: "on thursday",
-			seed: "2023-11-14T15:04:05Z07:00",
+			seed: "2023-11-16T15:04:05Z",
-			want: "2023-11-20T15:04:05Z07:00",
+			want: "2023-11-22T15:04:05Z",
 		},
 		{
 			name: "on saturday",
-			seed: "2023-11-18T15:04:05Z07:00",
+			seed: "2023-11-18T15:04:05Z",
-			want: "2023-11-20T15:04:05Z07:00",
+			want: "2023-11-22T15:04:05Z",
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			seedt, _ := time.Parse(time.RFC3339, tt.seed)
+			seedt, err := time.Parse(time.RFC3339, tt.seed)
-			now = func() time.Time { return seedt }
+			require.NoError(t, err)
-			wantt, _ := time.Parse(time.RFC3339, tt.want)
+
-			if got := NextWednesday(); !reflect.DeepEqual(got, wantt) {
+			wantt, err := time.Parse(time.RFC3339, tt.want)
+			require.NoError(t, err)
+
+			testClock := TestClock{now: seedt}
+			if got := NextWednesday(testClock); !reflect.DeepEqual(got, wantt) {
 				t.Errorf("NextWednesday() = %v, want %v", got, wantt)
 			}
 		})