add autorankup

src/test/java/sh/okx/rankup/messages/MessageBuilderTest.java

@@ -0,0 +1,14 @@
+package sh.okx.rankup.messages;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.CoreMatchers.*;
+
+
+public class MessageBuilderTest {
+  @Test
+  public void testFailIfEmpty() {
+    assertThat(new MessageBuilder("").failIfEmpty(), instanceOf(EmptyMessageBuilder.class));
+  }
+}