Run-time mocking in C?

Question

This has been pending for a long time in my list now. In brief - I need to run mocked_dummy() in the place of dummy() ON RUN-TIME, wit

Answer 1

test-dept is a relatively recent C unit testing framework that allows you to do runtime stubbing of functions. I found it very easy to use - here's an example from their docs:

void test_stringify_cannot_malloc_returns_sane_result() {
  replace_function(&malloc, &always_failing_malloc);
  char *h = stringify('h');
  assert_string_equals("cannot_stringify", h);
}

Although the downloads section is a little out of date, it seems fairly actively developed - the author fixed an issue I had very promptly. You can get the latest version (which I've been using without issues) with:

svn checkout http://test-dept.googlecode.com/svn/trunk/ test-dept-read-only

the version there was last updated in Oct 2011.

However, since the stubbing is achieved using assembler, it may need some effort to get it to support ARM.