#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include "astr.h"


static void
test_astr_alloc_empty(void)
{
    char *s = astr_alloc_empty();
    assert(s);
    assert(0 == strlen(s));
    free(s);
}


static void
test_astr_alloc_format(void)
{
    char *s = astr_alloc_format("answer: %i", 42);
    assert(s);
    assert(10 == strlen(s));
    assert(astr_eq("answer: 42", s));
    free(s);
}


static void
test_astr_alloc_format_for_NULL_format(void)
{
    errno = 0;
    char *s = astr_alloc_format(NULL);
    assert(!s);
    assert(EINVAL == errno);
    free(s);
}


static void
test_astr_eq(void)
{
    char *s = astr_alloc_format("foo");

    assert(astr_eq("foo", s));
    assert(!astr_eq(s, "bar"));

    free(s);
}


static void
test_astr_eq_for_NULL_string(void)
{
    char *s = astr_alloc_format("foo");

    assert(!astr_eq(s, NULL));
    assert(!astr_eq(NULL, s));
    assert(astr_eq(NULL, NULL));

    free(s);
}


static void
test_astr_eq_for_empty_strings(void)
{
    char *s1 = astr_alloc_empty();
    char *s2 = astr_alloc_empty();

    assert(s1 != s2);
    assert(astr_eq(s1, s2));

    free(s2);
    free(s1);
}


static void
test_astr_len_format(void)
{
    errno = 0;
    size_t length = astr_len_format("answer: %i", 42);
    assert(10 == length);
    assert(0 == errno);
}


static void
test_astr_len_format_for_NULL_format(void)
{
    errno = 0;
    size_t length = astr_len_format(NULL);
    assert(0 == length);
    assert(EINVAL == errno);
}


int
main(int argc, char *argv[])
{
    test_astr_alloc_empty();
    test_astr_alloc_format();
    test_astr_alloc_format_for_NULL_format();
    test_astr_eq();
    test_astr_eq_for_NULL_string();
    test_astr_eq_for_empty_strings();
    test_astr_len_format();
    test_astr_len_format_for_NULL_format();
    return EXIT_SUCCESS;
}