@@ -0,0 +1,658 @@
+package com.matao;%0A%0Aimport org.junit.jupiter.api.Assertions;%0Aimport org.junit.jupiter.api.BeforeEach;%0Aimport org.junit.jupiter.api.Test;%0A%0A/**%0A * Created by matao on 2019-01-06.%0A */%0Apublic class Q50_FirstNotRepeatingCharTest %7B%0A%0A    private Q50_FirstNotRepeatingChar firstNotRepeatingChar;%0A%0A    @BeforeEach%0A    void setUp() %7B%0A        firstNotRepeatingChar = new Q50_FirstNotRepeatingChar();%0A    %7D%0A%0A    @Test%0A    void test() %7B%0A        Assertions.assertEquals('b', firstNotRepeatingChar.firstNotRepeatingChar(%22abaccdeff%22));%0A    %7D%0A%0A    @Test%0A    void testNull() %7B%0A        Assertions.assertEquals('%5C77', firstNotRepeatingChar.firstNotRepeatingChar(null));%0A    %7D%0A%7D%0A

add test cases for FirstNotRepeatingChar