public void Add_method_accepts_unknown_number_of_numbers()
{
// Allow the Add method to handle an unknown amount of numbers
// Arrange
var randomNumber = new Random().Next(1, 100);
var numbersList = new List<int>(randomNumber);
var builder = new StringBuilder();
for (var index = 0; index < randomNumber; index++)
{
var thisNumber = new Random().Next(0, 100);
numbersList.Add(thisNumber);
if (builder.Length > 0)
builder.Append(",");
builder.Append(thisNumber);
}
var numbers = builder.ToString();
var expected = numbersList.Sum();
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_accepts_newline_delimiters()
{
// Arrange
var numbers = "1\n2";
var expected = 3;
// Act
var actual = new Calculator(new string[] { ",", "\n" }).Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_accepts_optional_delimiter_line()
{
// Support different delimiters to change a delimiter,
// the beginning of the string will contain a separate line that looks like this:
// “//[delimiter]\n[numbers…]” for example “//;\n1;2” should return three where the default delimiter is ‘;’ .
// the first line is optional. all existing scenarios should still be supported
// Arrange
var numbers = "//;\n1;2";
var expected = 3;
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_ignores_numbers_higher_that_1000()
{
// Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2
// Arrange
var numbers = "2,1001";
var expected = 2;
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Multiple_delimiters_may_be_any_length()
{
// Allow multiple delimiters like this:
// “//[delim1][delim2]\n” for example “//[*][%]\n1*2%3” should return 6.
// Arrange
var numbers = "//[*][%]\n1*2%3";
var expected = 6;
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Delimiters_may_be_any_length()
{
// Delimiters can be of any length with the following format:
// “//[delimiter]\n” for example: “//[***]\n1***2***3” should return 6
// Arrange
var numbers = "//[***]\n1***2***3";
var expected = 6;
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_returns_zero_for_empty_string()
{
// Arrange
var expected = 0;
// Act
var actual = new Calculator().Add(String.Empty);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_returns_two_for_the_number_two()
{
// Arrange
var expected = 2;
// Act
var actual = new Calculator().Add("2");
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void Add_method_returns_sum_of_specified_numbers(string numbers, int answer)
{
// Arrange
var values = (string.IsNullOrEmpty(numbers)) ? new int[] { 0,0} : numbers.Split(new char[] { ',' }).Select<string, int>(number => int.Parse(number));
var expected = values.Sum();
// Act
var actual = new Calculator().Add(numbers);
// Assert
Assert.That(actual, Is.EqualTo(expected));
}
