RequestToJoinEnum contains an int instead of a byte.

Added requestToJoin and joinAcceptance encoding functions to RaceVisionByteEncoder.
Implemented JoinAcceptanceDecoder.
Implemented RequestToJoinDecoder.
Added tests for encoding/decoding RequestToJoin and JoinAcceptance messages.

issue #35
#story[1095]

racevisionGame/src/test/java/network/MessageDecoders/RequestToJoinDecoderTest.java

@@ -0,0 +1,82 @@
+package network.MessageDecoders;
+
+import network.MessageEncoders.RaceVisionByteEncoder;
+import network.Messages.Enums.RequestToJoinEnum;
+import network.Messages.RequestToJoin;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+
+/**
+ * Test for the RequestToJoin encoder and decoder
+ */
+public class RequestToJoinDecoderTest {
+
+
+    /**
+     * Encodes and decodes a given message.
+     * @param message Message to encode/decode.
+     * @return The decoded message.
+     */
+    private RequestToJoin encodeDecodeMessage(RequestToJoin message) {
+
+        //Encode.
+        byte [] testEncodedMessage = RaceVisionByteEncoder.requestToJoin(message);
+
+        //Decode.
+        RequestToJoinDecoder testDecoder = new RequestToJoinDecoder(testEncodedMessage);
+        RequestToJoin decodedMessage = testDecoder.getMessage();
+
+        return decodedMessage;
+    }
+
+
+    /**
+     * Tests if a specific request type message can be encoded and decoded correctly.
+     * @param type The type of join request.
+     */
+    private void requestTypeTest(RequestToJoinEnum type) throws Exception {
+
+        //Prepare message.
+        RequestToJoin beforeMessage = new RequestToJoin(type);
+
+
+        //Encode/decode it.
+        RequestToJoin afterMessage = encodeDecodeMessage(beforeMessage);
+
+
+        //Compare.
+        assertEquals(beforeMessage.getRequestType().getValue(), afterMessage.getRequestType().getValue());
+
+    }
+
+
+    /**
+     * Tests if a spectator request message can be encoded and decoded correctly.
+     */
+    @Test
+    public void spectatorTest() throws Exception {
+        requestTypeTest(RequestToJoinEnum.SPECTATOR);
+    }
+
+    /**
+     * Tests if a participant request message can be encoded and decoded correctly.
+     */
+    @Test
+    public void participantTest() throws Exception {
+        requestTypeTest(RequestToJoinEnum.PARTICIPANT);
+    }
+
+    /**
+     * Tests if a ghost request message can be encoded and decoded correctly.
+     */
+    @Test
+    public void ghostTest() throws Exception {
+        requestTypeTest(RequestToJoinEnum.GHOST);
+    }
+
+
+
+}