public static void BuildNew___Should_throw_ArgumentNullException___When_parameter_workbook_is_null()
        {
            // Arrange, Act
            var actual = Record.Exception(() => StyleContainer.BuildNew(null));

            // Assert
            actual.Should().BeOfType <ArgumentNullException>();
            actual.Message.Should().Contain("workbook");
        }
        public static void BuildNew___Should_return_a_style_container___When_called()
        {
            // Arrange
            var worksheet = A.Dummy <Worksheet>();

            // Act
            var actual = StyleContainer.BuildNew(worksheet.Workbook);

            // Assert
            actual.Should().NotBeNull();
            actual.Style.Should().NotBeNull();
            actual.StyleFlag.Should().NotBeNull();
        }