public void Test_main()
{
//Given a string s, find the length of the longest substring without repeating characters.
ILongestSubstring longSubstring = CreateMainClass();
string s0 = "abcabcbb";
int expectResult0 = 3;
Assert.Equal(expectResult0, longSubstring.LengthOfLongestSubstring(s0));
string s2 = "bbbbb";
int expectResult2 = 1;
Assert.Equal(expectResult2, longSubstring.LengthOfLongestSubstring(s2));
string s3 = "pwwkew"; //wke
int expectResult3 = 3;
Assert.Equal(expectResult3, longSubstring.LengthOfLongestSubstring(s3));
}
public void Test_mock()
{
//Good mock example
var lsMock = new Mock <ILongestSubstring>();
lsMock.Setup(l => l.LengthOfLongestSubstring("abcabcbb")).Returns(3);
ILongestSubstring mock = lsMock.Object;
string s = "abcabcbb";
int expectResult = 3;
Assert.Equal(expectResult, mock.LengthOfLongestSubstring(s));
}