feat(login): randomize Russian welcome headlines

test/web/test_player_app.js

@@ -48,6 +48,21 @@ test("frontend name suggestions randomize both words and remain bounded", () =>
   assert.doesNotMatch(script, /suggest_name|name_suggestion/);
 });
 
+test("login headline selection is randomizable, Russian, and has a fallback", () => {
+  assert.ok(player.LOGIN_HEADLINES.length >= 8);
+  const selected = player.randomLoginHeadline(() => 5);
+  assert.deepEqual(selected, {first: "Крот сказал", highlight: "что это срез"});
+  assert.equal(player.randomLoginHeadline(() => -1), player.LOGIN_HEADLINES[0]);
+  for (const headline of player.LOGIN_HEADLINES) {
+    assert.match(headline.first, /[А-Яа-яЁё]/u);
+    assert.match(headline.highlight, /[А-Яа-яЁё]/u);
+  }
+
+  const script = fs.readFileSync(path.join(project, "web/player.js"), "utf8");
+  assert.match(script, /renderWelcomeHeadline\(randomLoginHeadline\(\)\)/);
+  assert.match(script, /title\.replaceChildren/);
+});
+
 test("command envelopes contain intentions rather than client-owned state", () => {
   const move = player.createEnvelope("move", 7, "move-7", {direction: "west"});
   assert.deepEqual(move, {v: 1, type: "move", seq: 7, requestId: "move-7", payload: {direction: "west"}});