feat(multiplayer): cap websocket connections per player

server/api/events_connection_test.go

@@ -0,0 +1,22 @@
+package api
+
+import "testing"
+
+func TestEventHubCapsConnectionsPerPlayerAndReleasesCapacity(t *testing.T) {
+	hub := newEventHub()
+	first := hub.subscribe("player-1")
+	second := hub.subscribe("player-1")
+	if first == nil || second == nil {
+		t.Fatal("connection within per-player cap was rejected")
+	}
+	if third := hub.subscribe("player-1"); third != nil {
+		t.Fatal("connection over per-player cap was accepted")
+	}
+	hub.unsubscribe(first)
+	if third := hub.subscribe("player-1"); third == nil {
+		t.Fatal("released connection capacity was not reusable")
+	} else {
+		hub.unsubscribe(third)
+	}
+	hub.unsubscribe(second)
+}