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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. It has a tutorial on testing with mocks, API documentation, and a variety of examples.

#include <stdarg.h>
#include <stddef.h>
#include <setjmp.h>
#include <cmocka.h>

void null_test_success (void ** state) {}

void null_test_fail (void ** state)
    assert_true (0);

/* These functions will be used to initialize
   and clean resources up after each test run */
int setup (void ** state)
    return 0;

int teardown (void ** state)
    return 0;
int main (void)
    const struct CMUnitTest tests [] =
        cmocka_unit_test (null_test_success),
        cmocka_unit_test (null_test_fail),

    /* If setup and teardown functions are not
       needed, then NULL may be passed instead */

    int count_fail_tests =
        cmocka_run_group_tests (tests, setup, teardown);

    return count_fail_tests;

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