diff --git a/S7.Net.UnitTest/CommunicationTests/ConnectionOpen.cs b/S7.Net.UnitTest/CommunicationTests/ConnectionOpen.cs
index d19f7c3..15568d5 100644
--- a/S7.Net.UnitTest/CommunicationTests/ConnectionOpen.cs
+++ b/S7.Net.UnitTest/CommunicationTests/ConnectionOpen.cs
@@ -12,107 +12,8 @@ public class ConnectionOpen
     public async Task Does_Not_Throw()
     {
         var cs = new CommunicationSequence {
-            {
-                """
-                    // TPKT
-                    03 // Version
-                    00 // Reserved
-                    00 16 // Length
-
-                    // CR
-                    11 // Number of bytes following
-                    E0 // CR / Credit
-                    00 00 // Destination reference, unused
-                    __ __ // Source reference, unused
-                    00 // Class / Option
-
-                    // Source TSAP
-                    C1 // Parameter code
-                    02 // Parameter length
-                    TSAP_SRC_CHAN // Channel
-                    TSAP_SRC_POS // Position
-
-                    // Destination TSAP
-                    C2 // Parameter code
-                    02 // Parameter length
-                    TSAP_DEST_CHAN // Channel
-                    TSAP_DEST_POS // Position
-
-                    // PDU Size parameter
-                    C0 // Parameter code
-                    01 // Parameter length
-                    0A // 1024 byte PDU (2 ^ 10)
-                """,
-                """
-                    // TPKT
-                    03 // Version
-                    00 // Reserved
-                    00 0B // Length
-
-                    // CC
-                    06 // Length
-                    D0 // CC / Credit
-                    00 00 // Destination reference
-                    00 00 // Source reference
-                    00 // Class / Option
-                """
-            },
-            {
-                """
-                    // TPKT
-                    03 // Version
-                    00 // Reserved
-                    00 19 // Length
-
-                    // Data header
-                    02 // Length
-                    F0 // Data identifier
-                    80 // PDU number and end of transmission
-
-                    // S7 header
-                    32 // Protocol ID
-                    01 // Message type job request
-                    00 00 // Reserved
-                    PDU1 PDU2 // PDU reference
-                    00 08 // Parameter length (Communication Setup)
-                    00 00 // Data length
-
-                    // Communication Setup
-                    F0 // Function code
-                    00 // Reserved
-                    00 03 // Max AMQ caller
-                    00 03 // Max AMQ callee
-                    03 C0 // PDU size (960)
-                """,
-                """
-                    // TPKT
-                    03 // Version
-                    00 // Reserved
-                    00 1B // Length
-
-                    // Data header
-                    02 // Length
-                    F0 // Data identifier
-                    80 // PDU number and end of transmission
-
-                    // S7 header
-                    32 // Protocol ID
-                    03 // Message type ack data
-                    00 00 // Reserved
-                    PDU1 PDU2 // PDU reference
-                    00 08 // Parameter length (Communication Setup)
-                    00 00 // Data length
-                    00 // Error class
-                    00 // Error code
-
-                    // Communication Setup
-                    F0 // Function code
-                    00 // Reserved
-                    00 03 // Max AMQ caller
-                    00 03 // Max AMQ callee
-                    03 C0 // PDU size (960)
-                """
-            }
+            ConnectionOpenTemplates.ConnectionRequestConfirm,
+            ConnectionOpenTemplates.CommunicationSetup
         };
 
         async Task Client(int port)
diff --git a/S7.Net.UnitTest/CommunicationTests/ConnectionOpenTemplates.cs b/S7.Net.UnitTest/CommunicationTests/ConnectionOpenTemplates.cs
new file mode 100644
index 0000000..cb9cc0a
--- /dev/null
+++ b/S7.Net.UnitTest/CommunicationTests/ConnectionOpenTemplates.cs
@@ -0,0 +1,107 @@
+namespace S7.Net.UnitTest.CommunicationTests;
+
+internal static class ConnectionOpenTemplates
+{
+    public static RequestResponsePair ConnectionRequestConfirm { get; } = new RequestResponsePair(
+        """
+            // TPKT
+            03 // Version
+            00 // Reserved
+            00 16 // Length
+
+            // CR
+            11 // Number of bytes following
+            E0 // CR / Credit
+            00 00 // Destination reference, unused
+            __ __ // Source reference, unused
+            00 // Class / Option
+
+            // Source TSAP
+            C1 // Parameter code
+            02 // Parameter length
+            TSAP_SRC_CHAN // Channel
+            TSAP_SRC_POS // Position
+
+            // Destination TSAP
+            C2 // Parameter code
+            02 // Parameter length
+            TSAP_DEST_CHAN // Channel
+            TSAP_DEST_POS // Position
+
+            // PDU Size parameter
+            C0 // Parameter code
+            01 // Parameter length
+            0A // 1024 byte PDU (2 ^ 10)
+        """,
+        """
+            // TPKT
+            03 // Version
+            00 // Reserved
+            00 0B // Length
+
+            // CC
+            06 // Length
+            D0 // CC / Credit
+            00 00 // Destination reference
+            00 00 // Source reference
+            00 // Class / Option
+        """
+    );
+
+    public static RequestResponsePair CommunicationSetup { get; } = new RequestResponsePair(
+        """
+            // TPKT
+            03 // Version
+            00 // Reserved
+            00 19 // Length
+
+            // Data header
+            02 // Length
+            F0 // Data identifier
+            80 // PDU number and end of transmission
+
+            // S7 header
+            32 // Protocol ID
+            01 // Message type job request
+            00 00 // Reserved
+            PDU1 PDU2 // PDU reference
+            00 08 // Parameter length (Communication Setup)
+            00 00 // Data length
+
+            // Communication Setup
+            F0 // Function code
+            00 // Reserved
+            00 03 // Max AMQ caller
+            00 03 // Max AMQ callee
+            03 C0 // PDU size (960)
+        """,
+        """
+            // TPKT
+            03 // Version
+            00 // Reserved
+            00 1B // Length
+
+            // Data header
+            02 // Length
+            F0 // Data identifier
+            80 // PDU number and end of transmission
+
+            // S7 header
+            32 // Protocol ID
+            03 // Message type ack data
+            00 00 // Reserved
+            PDU1 PDU2 // PDU reference
+            00 08 // Parameter length (Communication Setup)
+            00 00 // Data length
+            00 // Error class
+            00 // Error code
+
+            // Communication Setup
+            F0 // Function code
+            00 // Reserved
+            00 03 // Max AMQ caller
+            00 03 // Max AMQ callee
+            03 C0 // PDU size (960)
+        """
+    );
+}
\ No newline at end of file
diff --git a/S7.Net.UnitTest/Infrastructure/CommunicationSequence.cs b/S7.Net.UnitTest/Infrastructure/CommunicationSequence.cs
index 429b346..c3e4488 100644
--- a/S7.Net.UnitTest/Infrastructure/CommunicationSequence.cs
+++ b/S7.Net.UnitTest/Infrastructure/CommunicationSequence.cs
@@ -13,9 +13,9 @@ internal class CommunicationSequence : IEnumerable<RequestResponsePair>
 {
     private readonly List<RequestResponsePair> _requestResponsePairs = new List<RequestResponsePair>();
 
-    public CommunicationSequence()
+    public void Add(RequestResponsePair requestResponsePair)
     {
-        
+        _requestResponsePairs.Add(requestResponsePair);
     }
 
     public void Add(string requestPattern, string responsePattern)