Refactor code structure for improved readability and maintainability

test/timetable.test.js

@@ -58,3 +58,28 @@ test("range=semester: все дни текущего семестра от пе
   assert.equal(t.days.at(-1).date, t.semester.end);
   assert.ok(t.days.length > 62, "больше обычного предела в 62 дня");
 });
+
+test("Сессия с датами в Word не зависит от таблицы недель", () => {
+  // June 2026 lies outside the 2026/27 week table, yet every lesson has its own date.
+  const session = parseDocx(fixture("itzs-summer-2026"), { name: "23-ИТзс.docx" });
+  const t = timetable({
+    file: { id: "itzs", name: "23-ИТзс.docx" },
+    schedule: session,
+    calendar,
+    group: "23-ИТзс",
+    from: "2026-10-19",
+    range: "semester",
+    today: "2026-10-19",
+  });
+  assert.deepEqual(t.semester, {
+    id: "session-2026-06-08",
+    label: "Лабораторно-экзаменационная сессия",
+    start: "2026-06-08",
+    end: "2026-06-27",
+  });
+  assert.equal(t.note, null);
+  assert.equal(t.days.length, 20);
+  assert.equal(t.days.reduce((n, d) => n + d.lessons.length, 0), 58);
+  const exam = t.days.find((d) => d.date === "2026-06-18").lessons.find((l) => l.type === "Экзамен");
+  assert.deepEqual([exam.start, exam.end, exam.pair], ["08:30", "09:55", 1]);
+});