fix unread cache invalidation for forwarded messages

server/store/subscription_unread_test.go

@@ -0,0 +1,28 @@
+package store
+
+import "testing"
+
+func TestSubscriptionUpdateAffectsUnread(t *testing.T) {
+	tests := []struct {
+		name   string
+		update map[string]any
+		want   bool
+	}{
+		{name: "read seq", update: map[string]any{"ReadSeqId": int64(12)}, want: true},
+		{name: "delete marker", update: map[string]any{"DelId": 4}, want: true},
+		{name: "want mode", update: map[string]any{"ModeWant": 1}, want: true},
+		{name: "given mode", update: map[string]any{"ModeGiven": 1}, want: true},
+		{name: "deleted", update: map[string]any{"DeletedAt": "now"}, want: true},
+		{name: "recv only", update: map[string]any{"RecvSeqId": int64(12)}, want: false},
+		{name: "private only", update: map[string]any{"Private": map[string]any{"mute": true}}, want: false},
+		{name: "empty", update: map[string]any{}, want: false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := subscriptionUpdateAffectsUnread(tc.update); got != tc.want {
+				t.Fatalf("subscriptionUpdateAffectsUnread() = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}