added serialize() method to QDnsHeader and associated tests

src/modules/dns/includes/dns/QDnsHeader.h

         QDnsHeader();
 
         static QDnsHeader parse(const QByteArray& data);
+        QByteArray serialize() const;
 
         bool isValid() const;
 

src/modules/dns/src/QDnsHeader.cpp

         m_additionalCount = additionalCount;
     }
 
+    QByteArray QDnsHeader::serialize() const
+    {
+        if (isValid())
+        {
+            QByteArray data;
+            QDataStream ds(&data, QIODevice::WriteOnly);
+            ds << m_id;
+            ds << m_flags;
+            ds << m_questionCount;
+            ds << m_answerCount;
+            ds << m_authorityCount;
+            ds << m_additionalCount;
+            return data;
+        }
+        return QByteArray();
+    }
+
 }

tests/main.cpp

 #include <gtest/gtest.h>
-#include <QtCore/QByteArray>
+#include <QByteArray>
+#include <QString>
 
 #include "dns/QDnsHeader.h"
 
         ASSERT_EQ(header.getAnswerCount(), params.answerCount);
         ASSERT_EQ(header.getAuthorityCount(), params.authorityCount);
         ASSERT_EQ(header.getAdditionalCount(), params.additionalCount);
+
+        ASSERT_EQ(header.serialize().toHex(), QString(params.hexData).remove(" "));
+    }
+    else
+    {
+        ASSERT_EQ(header.serialize().size(), 0);
     }
 }
 
 TEST_P(DNSHeaderTest, settersAndGetters1)
 {
     auto params = GetParam();
+
+    if (!params.isValid)
+    {
+        return;
+    }
+
     auto data = QByteArray::fromHex(params.hexData);
     QDNS::QDnsHeader header;
 
     ASSERT_EQ(header.getAnswerCount(), params.answerCount);
     ASSERT_EQ(header.getAuthorityCount(), params.authorityCount);
     ASSERT_EQ(header.getAdditionalCount(), params.additionalCount);
+
+    ASSERT_EQ(header.serialize().toHex(), QString(params.hexData).remove(" "));
 }
 
 TEST_P(DNSHeaderTest, settersAndGetters2)
 {
     auto params = GetParam();
+
+    if (!params.isValid)
+    {
+        return;
+    }
+
     auto data = QByteArray::fromHex(params.hexData);
     QDNS::QDnsHeader header;
 
     ASSERT_EQ(header.getAnswerCount(), params.answerCount);
     ASSERT_EQ(header.getAuthorityCount(), params.authorityCount);
     ASSERT_EQ(header.getAdditionalCount(), params.additionalCount);
+
+    ASSERT_EQ(header.serialize().toHex(), QString(params.hexData).remove(" "));
 }
 
 INSTANTIATE_TEST_CASE_P(DNSHeaderTestInst,