CUnit Programmers Reference  3.0
CUnit : A Unit Testing Framework - forked from

CUnit is a Unit testing framework for C.

The basic framework is platform/version independent and should be portable to all platforms. CUnit provides various interfaces to the framework, some of which are platform dependent (e.g. curses on *nix). Building other interfaces should be straightforward with the facilities provided in the framework.

CUnit is built as either a static or shared library which provides framework support when linked into user testing code. The framework complies with the conventional structure of test cases bundled into suites which are registered with the framework for running. See the documentation for more about the structure and use of the framework.

Note - the windows-specific gui interface is not yet written. It is still necessary to use either the automated, basic, or console interfaces to CUnit on Windows at this time.

New Releases of CUnit - 2018-08 Onwards

This is a fork of CUnit from the SourceForge version. The fork may heal eventually but as of today I have not been able to contact the original maintainers of CUnit.

Cunity Cunit will maintain a classic-cunit branch that from now onwards only contains bugfixes and minor changes. This should be suitable as a drop-in for anyone formerly using the sourceforge git repo. This will only get small changes by-request from 2018-08-20 onwards.

The classic-cunit branch will remain buildable with Jam as with the sourceforge version but will only have light testing.

The master branch will be the latest code to pass the automated Gitlab CI build and test. The master branch will focus on CMake as it's sole build system and will gradually remove the old Jam/Make configurations as more of the project gets included in the CMake builds.

On, CUnit is regularly built on the following platforms:

  • Windows
  • MacOS
  • Ubuntu 20.04
  • Alpine Linux

Building CUnit

CUnit now builds using CMake ( as such, it should build on all cmake platforms including windows and linux without any changes (if it does not please log a bug)

Eg, on linux, you would do:-

mkdir local-build
cd local-build
cmake ..
cmake --build .

The above should result in a ./CUnit/Sources/libcunit.a file for your platform and a self-test program at ./CUnit/Sources/cunit_test

Using CUnit as a submodule

It is not always possible to build and install a package into the system you are using. If using CMake, you can include cunit as a submodule and compile it using an add_subdirectory() call.

git submodule add ... cunit

Then use.

target_link_libraries(mytest PRIVATE cunit)

Quick Start

You want to write a modern CUnit test compatible with common CI/CD workflows?

Here is the absolute simplest test program you can write.

#include "CUnit/CUnitCI.h"
/* Test that one equals one */
static void test_simple_pass1(void) {

When executed, the above program will write a JUnit XML report and print output similar to:

Starting CUnit test:
JUnit XML:
Running Suite : cicd-pass-plain
Running Test : test_simple_pass1 ..PASSED
Run Summary: Type Total Ran Passed Failed Inactive
suites 1 1 n/a 0 0
tests 1 1 1 0 0
asserts 1 1 1 0 n/a
Elapsed time = 0.000 seconds

A CUnit program written in this way will exit with a status value of zero if all the test have passed. This means you can easily include it in part of a CI script to fail a build early.

Setups and Teardowns

If you want to make use of setup and teardown functions (per suite or per test setup/cleanup) you can use the SETUP and TEARDOWN macros:-

#include "CUnit/CUnitCI.h"
char *buf = NULL;
size_t bufsize = 32;
/* run at the start of the suite */
buf = (char*) malloc(bufsize);
/* run at the end of the suite */
if (buf) free(buf);
/* run at the start of each test */
memset(buf, 1, bufsize);
/* run at the end of each test */
memset(buf, 0, bufsize);
/* Test that one equals one */
static void test_simple_pass1(void) {
/* Test that two is bigger than one */
static void test_simple_pass2(void) {

Online Documentation

You should be able to reach the latest doxygen documentation at