Ревью: тест CalendarService.cs: public class CalendarService { public bool IsWorkingDay() { switch (DateTime.Now.DayOfWeek) { case DayOfWeek.Saturday: case DayOfWeek.Sunday: return false; default: return true; } } } CalendarServiceTests.cs: public class CalendarServiceTests { [Fact] public void IsWorkingDay_Always_ReturnsTrue() { // Arrange var calendarService = new CalendarService(); // Act var actual = calendarService.IsWorkingDay(); // Assert Assert.True(actual); } }