CUnit 2.1.3 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is a product of The CUnit Team. The program is included in Developer Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
CUnit is a lightweight system for writing, administering, and running unit tests in C. It provides C programmers a basic testing functionality with a flexible variety of user interfaces. CUnit is built as a static library which is linked with the user's testing code.
You may want to check out more Mac applications, such as Objective Basic, Pleinpot or Epsilon, which might be similar to CUnit.