tests work for GOMAXPROCS>1

game.go

@@ -17,6 +17,7 @@ type game struct {
 	spectators  map[*Spectator]bool
 	sregister   chan *Spectator
 	sunregister chan *Spectator
+	kill        chan bool
 }
 
 func NewGame() *game {
@@ -30,6 +31,7 @@ func NewGame() *game {
 		spectators:  make(map[*Spectator]bool),
 		sregister:   make(chan *Spectator),
 		sunregister: make(chan *Spectator),
+		kill:        make(chan bool),
 	}
 }
 
@@ -66,6 +68,8 @@ func (g *game) run() {
 
 	for {
 		select {
+		case <-g.kill:
+			return
 		case p := <-g.register:
 			g.players[p] = true
 		case p := <-g.unregister:

id_test.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestIDGenerator(t *testing.T) {
+	cache := make(map[string]bool)
+	var cur string
+	gg := NewIdGenerator()
+	for i := 0; i < 10000; i++ {
+		cur = gg.Hash()
+		if _, ok := cache[cur]; ok {
+			t.Errorf("unexpected duplicate key")
+		}
+		cache[cur] = true
+	}
+}