some basic stuffs.

internal/color/color.go

@@ -180,6 +180,10 @@ func (col *Color) ToXY() (col2 Color, ok bool) {
 }
 
 func (col *Color) Interpolate(other Color, fac float64) Color {
+	if col.AlmostEquals(other) {
+		return *col
+	}
+
 	// Special case for kelvin values.
 	if col.IsKelvin() && other.IsKelvin() {
 		k1 := *col.K

internal/testutils/eventlogger.go

@@ -0,0 +1,87 @@
+package testutils
+
+import (
+	"fmt"
+	lucifer3 "git.aiterp.net/lucifer3/server"
+	"log"
+	"math/rand"
+	"sync/atomic"
+	"testing"
+)
+
+type syncEvent struct {
+	id uint64
+}
+
+func (s syncEvent) EventDescription() string {
+	return fmt.Sprintf("syncEvent(%d)", s.id)
+}
+
+type TestEventLogger struct {
+	entries []any
+	syncN   uint64
+	syncCh  chan struct{}
+}
+
+func (l *TestEventLogger) Active() bool {
+	return true
+}
+
+func (l *TestEventLogger) Sync(bus *lucifer3.EventBus) {
+	l.syncCh = make(chan struct{})
+	v := rand.Int63()
+	atomic.StoreUint64(&l.syncN, uint64(v))
+
+	bus.RunEvent(syncEvent{id: uint64(v)})
+
+	<-l.syncCh
+}
+
+func (l *TestEventLogger) AssertEvent(t *testing.T, eventStr string) {
+	for i, entry := range l.entries {
+		if event, ok := entry.(lucifer3.Event); ok && eventStr == event.EventDescription() {
+			l.entries = l.entries[i+1:]
+			return
+		}
+	}
+
+	t.Errorf("Event not found: %s", eventStr)
+}
+
+func (l *TestEventLogger) AssertCommand(t *testing.T, commandStr string) {
+	for i, entry := range l.entries {
+		if cmd, ok := entry.(lucifer3.Command); ok {
+			log.Println(cmd.CommandDescription() == commandStr)
+		}
+		if command, ok := entry.(lucifer3.Command); ok && commandStr == command.CommandDescription() {
+			l.entries = l.entries[i+1:]
+			return
+		}
+	}
+
+	t.Errorf("Command not found: %s", commandStr)
+}
+
+func (l *TestEventLogger) HandleEvent(_ *lucifer3.EventBus, event lucifer3.Event) {
+	if ev, ok := event.(syncEvent); ok {
+		if atomic.CompareAndSwapUint64(&l.syncN, ev.id, 0) {
+			close(l.syncCh)
+		}
+	}
+
+	l.entries = append(l.entries, event)
+}
+
+func (l *TestEventLogger) HandleCommand(_ *lucifer3.EventBus, command lucifer3.Command) {
+	l.entries = append(l.entries, command)
+}
+
+func evStr(ev any) string {
+	if ev, ok := ev.(lucifer3.Event); ok {
+		return ev.EventDescription()
+	} else if ev, ok := ev.(lucifer3.Command); ok {
+		return ev.CommandDescription()
+	}
+
+	panic("Unknown type")
+}