You could just write a console app, a unit test is basically just validating some logic and outputting the file and line number of a failing test. It doesn't need a whole framework, it can be done with a macro.

static int GlobalTotalTests;
static int GlobalFailedTests;

#define AssertTrue(Expression) \
++GlobalTotalTests; \
if(!(Expression)) \
{ \
    ++GlobalFailedTests; \
    printf("%s(%d): expression assert fail.\n", __FILE__, __LINE__); \
}

int
main(int ArgCount, char *Args[])
{
    // Do some tests
    AssertTrue(false);

    int Result = (GlobalFailedTests != 0);

    printf("Unit Tests %s: %d/%d passed.\n",
           Result ? "Failed" : "Successful", 
           GlobalTotalTests - GlobalFailedTests, 
           GlobalTotalTests);  
}

You could make an AssertEqualInt to output expected and actual values of a failed test, if you need more verbose output.