TcUnit is an xUnit type of framework specifically done for Beckhoff’s TwinCAT 3 development environment. It consists of a single library that is easily integrated into any existing TwinCAT 3 project.

Want to get started? Start by reading the unit testing concepts and then the introduction user guide.

Easy to use

The framework is easy to use. All that is needed is to download & install the library, and provide a reference to the TcUnit-library in your project, and you can start to write your test code. For a complete set of instructions, start with the concepts, continue with the user guide and finish with the programming example.


One library

All functionality is provided by one single library. Add the library to your project and you are ready to go! You can either download a precompiled (ready to install) version of the library or download the source code.



The library and all the source code is licensed according to the MIT-license, which is one of the most relaxed software license terms. The software is completely free and you can use the software in any way you want, be it private or for commercial use as long as you include the MIT license terms with your software.


Automated test runs

With the additional TcUnit-Runner software, it’s possible to do integrate all your TcUnit tests into a CI/CD software toolchain. With the aid of automation software such as Jenkins or Azure DevOps, you can have your tests being run automatically and collect test statistics every time something is changed in your software version control (such as Git or Subversion). If you want to know more, read the documentation for TcUnit-Runner.


This is a list of a few of the users of the TcUnit framework. Are you using TcUnit and want to be included here? Drop a message by using this contact form.

ESO extremely large telescope

The European Extremely Large Telescope (ELT) is a revolutionary scientific project for a 40m-class telescope that will allow us to address many of the most pressing unsolved questions about our Universe.

The ELT will be the largest optical/near-infrared telescope in the world and will gather 13 times more light than the largest optical telescopes existing today. The ELT will be able to correct for the atmospheric distortions (i.e., fully adaptive and diffraction-limited) from the start, providing images 16 times sharper than those from the Hubble Space Telescope. The ELT will vastly advance astrophysical knowledge by enabling detailed studies of planets around other stars, the first galaxies in the Universe, super-massive black holes, and the nature of the Universe’s dark sector.

Text credit: ESO Image credit: ESO/L. Calçada


IRAM 30m radio telescope

The IRAM 30m millimeter radio telescope is a radio telescope for astronomical observations in the millimeter range of wavelengths, operated by the Institute for Radio Astronomy in the Millimeter Range (IRAM) and located on the Sierra Nevada, in Spain. It is the second largest millimeter-wave telescope in the world after the Large Millimeter Telescope.

Text credit: Wikipedia Image credit: Institut de Radioastronomie Millimétrique



ICON is an Austin-based technology company dedicated to revolutionizing homebuilding and making dignified housing the standard for people throughout the world. Using proprietary 3D printing robotics, software, and advanced materials, ICON is solving a plurality of problems in the contemporary building industry with their breakthrough technologies.

Text & Image credit: ICON


SLAC National Accelerator Laboratory – LCLS-II

The Linac Coherent Light Source-II (LCLS-II) is a free electron laser facility located at SLAC. The LCLS-II uses electrons accelerated to nearly the speed of light to generate beams of extremely bright X-ray laser light. The electrons fly through a series of magnets, which forces them to travel a zigzag path and give off energy in the form of X-rays. LCLS-II will provide a major jump in capability – moving from 120 pulses per second to 1 million pulses per second compared to the LCLS.

Text credit: SLAC National Accelerator Laboratory
Image credit: Alberto Gamazo/SLAC National Accelerator Laboratory


Dry Phase Patterning

With the dry phase patterning machine it’s possible to produce conducting structures on flexible materials like metals, paper, or plastic, using a principle basically as simple as punching a hole in a paper.

Text & Image credit: DP Patterning


CorPower wave energy converter

CorPower Ocean brings a new class of high efficiency Wave Energy Converters, enabling robust and cost- effective harvesting of electricity from ocean waves. The design principle is inspired by the pumping principles of the human heart and offers five times more energy per ton of device compared to previously known technology. This allows a large amount of energy to be harvested using a small low-cost device. A unique transparency to incoming wave energy provides storm survivability. The step-change increase in structural efficiency is enabled by a novel system design and an advanced control technology.

Text & image credit: CorPower Ocean