public void Add_GivenANumberGreaterThan1000_ShouldNotAdd(string input, int expected)
{
//Arrange
var sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenNegativeNumbers_ShouldThrowAnException(string input, string expected)
{
//Arrange
var sut = new StringCalculator();
//Act
var actual = Assert.Throws <Exception>(() => sut.Add(input));
//Assert
Assert.AreEqual(expected, actual.Message);
}
public void Add_GivenDifferentDelimiters_ShouldReturnTheSum(string input, int expected)
{
//Arrange
var sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenASingleNumber_ShouldReturnThatNumber(string input, int expected)
{
//Arrange
var sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenMultipleNumbers_ShouldReturnTheSum(string input, int expected)
{
//Arrange
StringCalculator sut = CreateStringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivendANullOrWhitespace_ShouldReturn0(string input)
{
//Arrange
var expected = 0;
var sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_TwoNumbersSplitByCommaInString_ReturnsSumOfNumbers()
{
//Arrange
var numberOne = random.Next(1, 10);
var numberTwo = random.Next(1, 10);
//Act
var addResult = StringCalculator.Add(numberOne + "," + numberTwo);
//Assert
Assert.That(addResult, Is.EqualTo(numberOne + numberTwo));
}
public void Calculate_NonNumericValue_ReturnsZero()
{
//e.g. "1,Elephant,6" = 0
// Arrange
var calculator = new StringCalculator();
// Action
var result = calculator.Add("1,Elephant,6", ',');
// Assert
Assert.Equal(result, 0);
}
public void Calculate_NumbersLargerThan100_IgnoresOver100sInSum()
{
//e.g. "1,2,100" = 3
// Arrange
var calculator = new StringCalculator();
// Action
var result = calculator.Add("1,2,100", ',');
// Assert
Assert.Equal(result, 3);
}
public void Calculate_CanUseAlternativeDelimiters_ReturnsSum()
{
//e.g. "1|2|3" = 6
// Arrange
var calculator = new StringCalculator();
// Action
var result = calculator.Add("1|2|3", '|');
// Assert
Assert.Equal(result, 6);
}
public void Calculate_FiveNumbers_ReturnsSum()
{
//e.g. "1,2,3,4,5" = 15
// Arrange
var calculator = new StringCalculator();
// Action
var result = calculator.Add("1,2,3,4,5", ',');
// Assert
Assert.Equal(result, 15);
}
public void Calculate_TwoNumbers_ReturnsSum()
{
//e.g. "1,2" = 3
// Arrange
var calculator = new StringCalculator();
// Action
var result = calculator.Add("1,2", ',');
// Assert
Assert.Equal(result, 3);
}
public void Add_GivenAnEmptyString_ShouldReturn0(string input)
{
//Arrange
var expected = 0;
StringCalculator sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenMultipleNegativeNumbers_ShouldThrowAnException()
{
//Arrange
var input = "-1, -2, -3";
var expected = "negatives not allowed: -1 -2 -3";
StringCalculator sut = CreateStringCalculator();
//Act
var actual = Assert.Throws <Exception>((() => sut.Add(input)));
//Assert
Assert.AreEqual(expected, actual.Message);
}
public void Add_GivenNumbers100And256_ShouldReturnSumOfNumbers()
{
//Arrange
string input = "100,256";
int expected = 356;
StringCalculator stringCalculator = new StringCalculator();
//Act
var result = stringCalculator.Add(input);
//Assert
Assert.AreEqual(expected, result);
}
public void Add_GivenEmptyString_ShouldReturn0()
{
//Arrange
string input = "";
int expected = 0;
StringCalculator stringCalculator = new StringCalculator();
//Act
var result = stringCalculator.Add(input);
//Assert
Assert.AreEqual(expected, result);
}
public void Add_GivenANumberOver1000_ShouldNotAdd()
{
//Arrange
var input = "1,1001";
var expected = 1;
var sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenSemiColonDelimiter_ShouldReturnSum()
{
//Arrange
var input = "//;\n1;2";
var expected = 3;
StringCalculator sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_GivenNewLineDelimiter_ShouldReturnSum()
{
//Arrange
var input = "1\n2,3";
var expected = 6;
StringCalculator sut = new StringCalculator();
//Act
var actual = sut.Add(input);
//Assert
Assert.AreEqual(expected, actual);
}
public void Add_RandomAmountOfNumbersSplitWithComma_ReturnsSumOfAllNumbers()
{
//Arrange
int totaal = 0;
List <int> numbers = new List <int>();
for (int i = 0; i < random.Next(2, 10); i++)
{
numbers.Add(random.Next(1, 10));
}
numbers.ForEach(n => totaal += n);
StringBuilder numbersString = new StringBuilder();
numbers.ForEach(n => numbersString.Append(n + ","));
//Act
var addResult = StringCalculator.Add(numbersString.ToString().TrimEnd(','));
//Assert
Assert.That(addResult, Is.EqualTo(totaal));
}
public void Add_Returns_0_For_Empty_String()
{
var result = underTest.Add("");
Assert.Equal(0, result);
}
public void Add_DelimeterOfAnyLengthReturnSum(string input, string expected)
{
string output = StringCalculator.Add(input);
Assert.AreEqual(expected, output);
}
public void Add_IgnoreNumbersBiggerThanOneThousand(string input, string expected)
{
var output = StringCalculator.Add(input);
Assert.AreEqual(expected, output);
}
public void Add_ThrowExceptionWhenNegativeNumberIsInserted(string input, string negNumber)
{
var exception = Assert.Throws <ArgumentException>(() => StringCalculator.Add(input));
Assert.That(exception.Message, Is.EqualTo(string.Format($"string contains {negNumber}. Negative not allowed")));
}
public void Add_WhenDifferentDelimeterReturnSum(string input, string expected)
{
string output = StringCalculator.Add(input);
Assert.AreEqual(expected, output);
}
public void Add_WhenNewLineBetweenNumReturnSum(string input, string expected)
{
string output = StringCalculator.Add(input);
Assert.AreEqual(expected, output);
}
public void Add_WheTwoNumbersReturnSum(string input, string expected)
{
string output = StringCalculator.Add(input);
Assert.AreEqual(expected, output);
}
public void Add_WhenOneNumberReturnNumber(string input)
{
string output = StringCalculator.Add(input);
Assert.AreEqual(input, output);
}
public void ReturnSum_WhenAdding_GivenManyNumbersAndNewLineWithSlashes(string manyNumbers, int expectedSum)
{
var sum = StringCalculator.Add(manyNumbers);
sum.Should().Be(expectedSum);
}
public void ReturnException_WhenAdding_GivenANegativeNumber(string manyNumbers, string expectedErrorMessage)
{
Action act = () => StringCalculator.Add(manyNumbers);
act.ShouldThrow <InvalidOperationException>().WithMessage(expectedErrorMessage);
}