fix: znemožnění spuštění Tetrisu v jednom hráči

server/src/tests/tetrisGame.test.ts

@@ -4,12 +4,12 @@ import { fakeClock } from './helpers/fakeClock';
 
 const BOARD = '0'.repeat(BOARD_WIDTH * (BOARD_HEIGHT - 1)) + '1'.repeat(BOARD_WIDTH);
 
-function setup() {
+function setup(minPlayers = 1) {
     const clock = fakeClock();
     const all: TetrisState[] = [];
     const watched: TetrisState[] = [];
     const garbage: GarbageEvent[] = [];
-    const game = new TetrisGame(s => all.push(s), s => watched.push(s), e => garbage.push(e), 1, clock);
+    const game = new TetrisGame(s => all.push(s), s => watched.push(s), e => garbage.push(e), minPlayers, clock);
     const last = () => all[all.length - 1];
     const startWith = (settings: Partial<TetrisSettings>, ...logins: string[]) => {
         logins.forEach(l => game.join(l));
@@ -22,6 +22,16 @@ function setup() {
 }
 
 describe('tetris', () => {
+    test('společnou hru nejde spustit jen s jedním hráčem', () => {
+        const ctx = setup(2);
+        ctx.game.join('alice');
+        expect(() => ctx.game.start('alice')).toThrow(GameError);
+        expect(ctx.last()).toMatchObject({ phase: 'lobby' });
+        ctx.game.join('bob');
+        ctx.game.start('alice');
+        expect(ctx.last()).toMatchObject({ phase: 'countdown' });
+    });
+
     test('po odpočtu začne hra se společným seedem', () => {
         const ctx = setup();
         ctx.startGame('alice', 'bob');