--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test-data/examples/external_code/ExampleLibraryFile.cpp	Sun Dec 13 15:03:50 2020 +0000
@@ -0,0 +1,46 @@
+// --------------------------------------------------------------------------
+//                   OpenMS -- Open-Source Mass Spectrometry
+// --------------------------------------------------------------------------
+// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
+// ETH Zurich, and Freie Universitaet Berlin 2002-2020.
+//
+// This software is released under a three-clause BSD license:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of any author or any participating institution
+//    may be used to endorse or promote products derived from this software
+//    without specific prior written permission.
+// For a full list of authors, refer to the file AUTHORS.
+// --------------------------------------------------------------------------
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL ANY OF THE AUTHORS OR THE CONTRIBUTING
+// INSTITUTIONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// --------------------------------------------------------------------------
+// $Maintainer: Chris Bielow $
+// $Authors: Chris Bielow $
+// --------------------------------------------------------------------------
+
+#include "ExampleLibraryFile.h"
+
+using namespace std;
+
+namespace OpenMSExternal //optional namespace... however you like it
+{
+  std::string ExampleLibraryFile::printSomething()
+  {
+    return "this is the external library.";
+  }
+
+}