Drew DeVault • 7/19/2016

Using -Wl,--wrap for mocking in C

This technical article details a method for mocking dependencies in C code for unit testing by using the GNU/LLVM linker's --wrap flag. It demonstrates how to wrap functions like fread and feof to control their behavior during tests, allowing for isolated testing without real file I/O. The author also discusses limitations and outlines a vision for a future custom test framework built around this mocking technique.

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#testing #unit testing #mocking