Simple C test macros based on the LCTHW macros by Zed Shaw (thanks!) with added colors and line number support.

c_test_macros.c

#include <stdio.h>

#define RED "\x1B[31m"
#define GREEN "\x1B[32m"
#define NORMAL "\x1B[0m"

#define STR(s) #s
#define TESTLINE(line) " ("__FILE__ ":" STR(line) ")"

#define test_assert(A, B) if(!(A)) { return B TESTLINE(__LINE__); };
#define test_setup() char *test_error_message = NULL;
#define run_test(T) printf("  %s: ", " " #T);\
    test_error_message = T();\
    if (test_error_message) { printf(RED"FAIL: %s\n"NORMAL, test_error_message); return -1; }\
    else { printf(GREEN"OK!\n"NORMAL); }

int my_function()
{
    return 1;
}

char *test_my_function()
{
    test_assert(my_function(), "my_function() failed");
    
    return NULL;
}

int main(int argc, char *argv[])
{
    printf("Running tests...\n");

    test_setup();

    run_test(test_my_function);

    printf("All tests passed.\n");

    return 0;
}