Add lobby and pack concept.

internal/game/game_test.go

@@ -18,7 +18,7 @@ func deckIDs(p *Player, filter func(Card) bool) []string {
 
 func current(g *Game) *Player { return g.Players[g.Turn] }
 
-func TestLobbyStartsWhenFull(t *testing.T) {
+func TestLobbyManualStart(t *testing.T) {
 	g := New()
 	if g.Phase != PhaseLobby {
 		t.Fatalf("new game should be in lobby, got %s", g.Phase)
@@ -26,18 +26,26 @@ func TestLobbyStartsWhenFull(t *testing.T) {
 	if _, err := g.AddPlayer("Alice"); err != nil {
 		t.Fatal(err)
 	}
-	if g.Phase != PhaseLobby {
-		t.Fatal("game should wait for second player")
+	// One player isn't enough to start.
+	if err := g.StartGame(); err == nil {
+		t.Fatal("start should be rejected with fewer than MinPlayers")
 	}
 	if _, err := g.AddPlayer("Bob"); err != nil {
 		t.Fatal(err)
 	}
-	if g.Phase != PhaseShop || g.Round != 1 {
-		t.Fatalf("game should start round 1 shop, got phase=%s round=%d", g.Phase, g.Round)
-	}
 	if _, err := g.AddPlayer("Carol"); err == nil {
 		t.Fatal("third player should be rejected while MaxPlayers=2")
 	}
+	// The lobby stays open until the host explicitly starts.
+	if g.Phase != PhaseLobby {
+		t.Fatalf("game should wait in the lobby for the host to start, got %s", g.Phase)
+	}
+	if err := g.StartGame(); err != nil {
+		t.Fatal(err)
+	}
+	if g.Phase != PhaseShop || g.Round != 1 {
+		t.Fatalf("game should start round 1 shop, got phase=%s round=%d", g.Phase, g.Round)
+	}
 	for _, p := range g.Players {
 		if p.Coins != CoinsPerRound {
 			t.Fatalf("player should start with %d coins", CoinsPerRound)