public void ReturnsAnEmptyString()
{
String args1 = "aaa";
FirstNonRepeatingLetter firstNPR1 = new FirstNonRepeatingLetter(args1);
Assert.AreEqual("", firstNPR1.Result());
}
public void ReturnsAString()
{
String args1 = "a";
FirstNonRepeatingLetter firstNPR1 = new FirstNonRepeatingLetter(args1);
Assert.IsInstanceOf <string>(firstNPR1.Result());
}
public void ReturnsTheFirstNonRepeatingCharacter()
{
String args1 = "aAc";
FirstNonRepeatingLetter firstNPR1 = new FirstNonRepeatingLetter(args1);
Assert.AreEqual("c", firstNPR1.Result());
String args2 = "aAccccde";
FirstNonRepeatingLetter firstNPR2 = new FirstNonRepeatingLetter(args2);
Assert.AreEqual("d", firstNPR2.Result());
String args3 = "aAccccDe";
FirstNonRepeatingLetter firstNPR3 = new FirstNonRepeatingLetter(args3);
Assert.AreEqual("D", firstNPR3.Result());
}