diff --git a/tests/common/CMakeLists.txt b/tests/common/CMakeLists.txt
index ff08956..049c5c6 100644
--- a/tests/common/CMakeLists.txt
+++ b/tests/common/CMakeLists.txt
@@ -1,4 +1,5 @@
 set(SRC
+    qiodevicecounter.cpp
     qsocketpair.cpp
 )
 
diff --git a/tests/common/qiodevicecounter.cpp b/tests/common/qiodevicecounter.cpp
new file mode 100644
index 0000000..dc7f9b5
--- /dev/null
+++ b/tests/common/qiodevicecounter.cpp
@@ -0,0 +1,36 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Nathan Osman
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "qiodevicecounter.h"
+
+QIODeviceCounter::QIODeviceCounter(QIODevice *device)
+    : mBytesWritten(0)
+{
+    connect(device, SIGNAL(bytesWritten(qint64)), this, SLOT(onBytesWritten(qint64)));
+}
+
+void QIODeviceCounter::onBytesWritten(qint64 bytes)
+{
+    mBytesWritten += bytes;
+}
diff --git a/tests/common/qiodevicecounter.h b/tests/common/qiodevicecounter.h
new file mode 100644
index 0000000..5e429b5
--- /dev/null
+++ b/tests/common/qiodevicecounter.h
@@ -0,0 +1,54 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Nathan Osman
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef QHTTPENGINE_QIODEVICECOUNTER_H
+#define QHTTPENGINE_QIODEVICECOUNTER_H
+
+#include <QIODevice>
+
+/**
+ * Counter for QIODevice's
+ */
+class QIODeviceCounter : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    QIODeviceCounter(QIODevice *device);
+
+    qint64 bytesWritten() const {
+        return mBytesWritten;
+    }
+
+private Q_SLOTS:
+
+    void onBytesWritten(qint64 bytes);
+
+private:
+
+    qint64 mBytesWritten;
+};
+
+#endif // QHTTPENGINE_QIODEVICECOUNTER_H