diff --git a/src/test/java/Main/ProtocolMessageTest.java b/src/test/java/Main/ProtocolMessageTest.java
new file mode 100644
index 0000000..146d510
--- /dev/null
+++ b/src/test/java/Main/ProtocolMessageTest.java
@@ -0,0 +1,19 @@
+package Main;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ProtocolMessageTest {
+
+    @Test
+    public void protocolBothWaysTest(){
+        int length = 10;
+        char[] msg = "1234567890".toCharArray();
+        ProtocolMessage messageIn = new ProtocolMessage(length, msg);
+        char[] data = messageIn.getRaw();
+        ProtocolMessage messageOut = new ProtocolMessage(data);
+        assertEquals(length, messageOut.getLength(), "Length not right.");
+        assertEquals(msg, messageOut.getMessage(), "Message not right.");
+
+    }
+}