add code

src/test/java/sh/okx/rankup/RankupTest.java

@@ -0,0 +1,9 @@
+package sh.okx.rankup;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+public class RankupTest {
+}