使用cmocka实现嵌入式单元测试

前言

单元测试是软件开发过程中非常重要的一环，只有“基础”牢固了，系统这座“大厦”才能稳定运行（抄自知乎）。

一、cmocka是什么？

cmocka is an elegant unit testing framework for C with support for mock objects. It only requires the standard C library, works on a range of computing platforms (including embedded) and with different compilers.

Features:

Tests written with cmocka are compiled into stand-alone executables and linked with the CMock library, the standard C library and module being tested. Any symbols external to the module being tested should be mocked - replaced with functions that return values determined by the test - within the test application. Even though significant differences may exist between the target execution environment of a code module and the environment used to test the code the unit testing is still valid since its goal is to test the logic of a code modules at a functional level and not necessarily all of its interactions with the target execution environment.

The CMocka library provides:

• Support for mock objects.
• Test fixtures.
• Only requires a C library
• Exception handling for signals (SIGSEGV, SIGILL, ...)
• No use of fork()
• Very well tested
• Testing of memory leaks, buffer overflows and underflows.
• A set of assert macros.
• Several supported output formats (stdout, TAP, JUnit XML, Subunit)
• License: Apache License 2.0

二、使用步骤

cmocka官网

cmocka使用说明

cmocka API说明

总结