public void Test_UniqueChar_Should_Return_Second_Letter()
{
//Given, When
char letter = StringOperations.FirstUniqueCharacter("aabcd");
//Then
Assert.Equal('b', letter);
}
public void Test_UniqueChar_Should_Return_first_char_ONE_letter()
{
//Given, When
char letter = StringOperations.FirstUniqueCharacter("a");
//Then
Assert.Equal('a', letter);
}
public void Test_UniqueChar_Should_Return_Null_When_NO_Character_was_Found()
{
//Given, When
Action exception = () => StringOperations.FirstUniqueCharacter("ababbbcc");
//Then
Assert.Throws <InvalidOperationException>(exception);
}
public void Test_UniqueChar_Should_Return_correctly_For_More_COMPLEX_Word()
{
//Given, When
char letter = StringOperations.FirstUniqueCharacter("ababbbcd");
//Then
Assert.Equal('c', letter);
}
public void Test_FirstUniqueCharacter()
{
var ch = StringOperations.FirstUniqueCharacter("abcdabcdD");
Assert.Equal('D', ch);
}