diff --git a/tests/quic/helpers/udp.nim b/tests/quic/helpers/udp.nim
new file mode 100644
index 0000000..9ec0a7a
--- /dev/null
+++ b/tests/quic/helpers/udp.nim
@@ -0,0 +1,32 @@
+import std/monotimes
+import quic
+import ngtcp2
+import path
+
+proc write*(connection: ptr ngtcp2_conn, datagram: var Datagram, datagramInfo: var ngtcp2_pkt_info): int =
+  var offset = 0
+  var length = 1
+  while length > 0 and offset < datagram.len:
+    length = connection.ngtcp2_conn_write_stream(
+      addr zeroPath,
+      addr datagramInfo,
+      addr datagram[offset],
+      (datagram.len - offset).uint,
+      nil,
+      NGTCP2_WRITE_STREAM_FLAG_MORE.uint32,
+      -1,
+      nil,
+      0,
+      getMonoTime().ticks.uint
+    )
+    offset = offset + length
+  offset
+
+proc read*(connection: ptr ngtcp2_conn, datagram: Datagram, datagramInfo: ngtcp2_pkt_info) =
+  assert 0 == connection.ngtcp2_conn_read_pkt(
+    addr zeroPath,
+    unsafeAddr datagramInfo,
+    unsafeAddr datagram[0],
+    datagram.len.uint,
+    getMonoTime().ticks.uint
+  )
diff --git a/tests/quic/testNgtcp2.nim b/tests/quic/testNgtcp2.nim
index 4b3b146..fa85b20 100644
--- a/tests/quic/testNgtcp2.nim
+++ b/tests/quic/testNgtcp2.nim
@@ -1,10 +1,10 @@
 import unittest
-import std/monotimes
 import ngtcp2
 import helpers/server
 import helpers/client
 import helpers/ids
 import helpers/path
+import helpers/udp
 
 suite "ngtcp2":
 
@@ -22,36 +22,31 @@ suite "ngtcp2":
 
     var datagram: array[16348, uint8]
     var datagramInfo: ngtcp2_pkt_info
+    var datagramLength = 0
 
     # handshake client -> server
     echo "--- CLIENT 1>>> SERVER"
-    check datagram.len == client.ngtcp2_conn_write_stream(addr zeroPath, addr datagramInfo, addr datagram[0], datagram.len.uint, nil, NGTCP2_WRITE_STREAM_FLAG_MORE.uint32, -1, nil, 0, getMonoTime().ticks.uint)
+    datagramLength = client.write(datagram, datagramInfo)
 
     # setup server connection using received datagram
     let server = setupServer(zeroPath, serverId, datagram)
     defer: ngtcp2_conn_del(server)
 
     echo "--- CLIENT >>>1 SERVER"
-    check 0 == server.ngtcp2_conn_read_pkt(addr zeroPath, addr datagramInfo, addr datagram[0], datagram.len.uint, getMonoTime().ticks.uint)
+    server.read(datagram[0..<datagramLength], datagramInfo)
 
     echo "--- CLIENT <<<2 SERVER"
-    var offset = 0
-    block:
-      var length = 1
-      offset = 0
-      while length > 0:
-        length = server.ngtcp2_conn_write_stream(addr zeroPath, addr datagramInfo, addr datagram[offset], (datagram.len - offset).uint, nil, NGTCP2_WRITE_STREAM_FLAG_MORE.uint32, -1, nil, 0, getMonoTime().ticks.uint)
-        offset = offset + length
+    datagramLength = server.write(datagram, datagramInfo)
 
     echo "--- CLIENT 2<<< SERVER"
-    check 0 == client.ngtcp2_conn_read_pkt(addr zeroPath, addr datagramInfo, addr datagram[0], offset.uint, getMonoTime().ticks.uint)
+    client.read(datagram[0..<datagramLength], datagramInfo)
 
     echo "--- CLIENT 3>>> SERVER"
-    check datagram.len == client.ngtcp2_conn_write_pkt(addr zeroPath, addr datagramInfo, addr datagram[0], datagram.len.uint, getMonoTime().ticks.uint)
+    datagramLength = client.write(datagram, datagramInfo)
 
     check client.ngtcp2_conn_get_handshake_completed().bool
 
     echo "--- CLIENT >>>3 SERVER"
-    check 0 == server.ngtcp2_conn_read_pkt(addr zeroPath, addr datagramInfo, addr datagram[0], datagram.len.uint, getMonoTime().ticks.uint)
+    server.read(datagram[0..<datagramLength], datagramInfo)
 
     check server.ngtcp2_conn_get_handshake_completed().bool