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

            // Assert
            actual.Should().BeOfType <ArgumentNullException>();
            actual.Message.Should().Contain("cell");
        }
        public static void BuildUsingExistingCellStyle___Should_build_style_container_using_existing_cell_style___When_called()
        {
            // Arrange
            var worksheet = A.Dummy <Worksheet>();
            var cell      = worksheet.Cells[1, 1];

            // Act
            var actual = StyleContainer.BuildUsingExistingCellStyle(cell);

            // Assert
            actual.Style.Should().Be(cell.GetStyle());
        }