public void Throws_ArgumentException_OnNull()
{
//Arrange
var service = new LetterCounterService();
//Act
Assert.ThrowsException <ArgumentException>(() => service.CountLetters(null));
}
public void CanIgnoreWhitespace()
{
//Arrange
string input = "a a";
var service = new LetterCounterService();
//Act
var letterCount = service.CountLetters(input);
//Assert
Assert.AreEqual(1, letterCount.Count);
Assert.AreEqual(2, letterCount['a']);
}
public void CanCountLetters()
{
//Arrange
string input = "abbcccddddeeeeeffffff";
var service = new LetterCounterService();
//Act
var letterCount = service.CountLetters(input);
//Assert
Assert.AreEqual(6, letterCount.Count);
Assert.AreEqual(1, letterCount['a']);
Assert.AreEqual(2, letterCount['b']);
Assert.AreEqual(3, letterCount['c']);
Assert.AreEqual(4, letterCount['d']);
Assert.AreEqual(5, letterCount['e']);
Assert.AreEqual(6, letterCount['f']);
}
public void CanCountLetters()
{
//Arrange
string input = "allegro";
var service = new LetterCounterService();
//Act
var letterCount = service.CountLetters(input);
//Assert
Assert.AreEqual(6, letterCount.Count);
Assert.AreEqual(1, letterCount['a']);
Assert.AreEqual(2, letterCount['l']);
Assert.AreEqual(1, letterCount['e']);
Assert.AreEqual(1, letterCount['g']);
Assert.AreEqual(1, letterCount['r']);
Assert.AreEqual(1, letterCount['o']);
}