XML Message Decoder added with test

-added XMLMessageDecoder to decode xml files from byte array
-added test class for xml decoder
-renamed getByteArray method to encode
-made longToSixBytes private

#story[778, 782]

src/test/java/XMLMessageDecoderTest.java

@@ -0,0 +1,47 @@
+import org.junit.Assert;
+import org.junit.Test;
+import seng302.XMLMessageDecoder;
+import seng302.XMLMessageEncoder;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Created by hba56 on 20/04/17.
+ */
+public class XMLMessageDecoderTest {
+    @Test
+    public void getByteArrayTest(){
+        try{
+            StringBuilder xmlString;
+            BufferedReader br = new BufferedReader(new InputStreamReader(
+                    this.getClass().getResourceAsStream(("raceXML/Regatta.xml"))));
+            String line;
+            xmlString = new StringBuilder();
+            while((line=br.readLine())!= null){
+                xmlString.append(line.trim());
+            }
+            long time = System.currentTimeMillis();
+            XMLMessageEncoder testEncoder = new  XMLMessageEncoder((byte)1, (short)1, time, (byte)7, (short)1, (short)xmlString.length(), xmlString.toString());
+
+            byte[] encodedXML = testEncoder.encode();
+
+            XMLMessageDecoder decoderXML = new XMLMessageDecoder(encodedXML);
+            decoderXML.decode();
+
+
+            Assert.assertEquals((byte)1, decoderXML.getMessageVersionNumber());
+            Assert.assertEquals((short)1, decoderXML.getAckNumber());
+            Assert.assertEquals(time, decoderXML.getTimeStamp());
+            Assert.assertEquals((byte)7, decoderXML.getXmlMsgSubType());
+            Assert.assertEquals((short)1, decoderXML.getSequenceNumber());
+            Assert.assertEquals((short)xmlString.length(), decoderXML.getXmlMsgLength());
+            Assert.assertEquals(xmlString.toString(), decoderXML.getXmlMessage());
+
+
+        }catch (IOException e){
+            System.out.println(e);
+        }
+    }
+}

src/test/java/XMLMessageEncoderTest.java

@@ -1,5 +1,4 @@
 import org.junit.Assert;
-import org.junit.Before;
 import org.junit.Test;
 import seng302.XMLMessageEncoder;
 
@@ -22,7 +21,7 @@ public class XMLMessageEncoderTest {
             }
             XMLMessageEncoder testEncoder = new  XMLMessageEncoder((byte)1, (short)1, System.currentTimeMillis(), (byte)7, (short)1, (short)xmlString.length(), xmlString.toString());
 
-            byte[] encodedXML = testEncoder.getByteArray();
+            byte[] encodedXML = testEncoder.encode();
 
             //1 + 2 + 6 + 1 + 2 + 2 + 374
             Assert.assertEquals(388, encodedXML.length);
@@ -44,7 +43,7 @@ public class XMLMessageEncoderTest {
             }
             XMLMessageEncoder testEncoder = new  XMLMessageEncoder((byte)1, (short)1, System.currentTimeMillis(), (byte)7, (short)1, (short)1, xmlString.toString());
 
-            byte[] encodedXML = testEncoder.getByteArray();
+            byte[] encodedXML = testEncoder.encode();
 
             Assert.assertEquals(null, encodedXML);
         }catch (IOException e){