public void InMemoryBook_CalculatesAnAvverageGrade() { //arrange переменные var book = new InMemoryBook(""); book.AddObjectGrade("A"); book.AddObjectGrade("B"); book.AddObjectGrade("C"); //act вычисления var result = book.GetStatistics(); //assert утверждение Assert.Equal(85.6, result.Average, 1); Assert.Equal(90.5, result.High, 1); Assert.Equal(77.3, result.Low, 1); Assert.Equal('B', result.Letter); }