public static void then_should_convert_a_to_single_plus_sign()
            {
                // Arrange
                const char character = 'a';

                // Act
                var convertedValue = CharacterConverter.ToColumnValues(character);

                // Assert
                Assert.That(convertedValue, Is.EqualTo(new[] { '+' }));
            }
            public static void then_should_convert_j_to_plus_plus_dash_dash_asterisk_asterisk_asterisk_period_period_period()
            {
                // Arrange
                const char character = 'j';

                // Act
                var convertedValue = CharacterConverter.ToColumnValues(character);

                // Assert
                Assert.That(convertedValue, Is.EqualTo(
                                new[]
                {
                    '+', '+', '-', '-', '*', '*', '*', '.', '.', '.'
                }));
            }