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Add a unit test for write_str_to_file_if_not_equal()

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This commit is contained in:
Nick Mathewson 2020-07-30 10:40:18 -04:00
parent f3e5b283ad
commit fcf4954cc8
1 changed files with 50 additions and 0 deletions
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50
src/test/test_util.c
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@ -357,6 +357,55 @@ test_util_write_chunks_to_file(void *arg)
tor_free(temp_str);
}
/* Test write_str_to_file_if_not_equal(). */
static void
test_util_write_str_if_changed(void *arg)
{
(void)arg;
char *fname = tor_strdup(get_fname("write_if_changed"));
char *s = NULL;
int rv;
const char str1[] = "The wombat lives across the seas";
const char str2[] = "Among the far Antipodes"; /* -- Ogden Nash */
/* We can create files. */
rv = write_str_to_file_if_not_equal(fname, str1);
tt_int_op(rv, OP_EQ, 0);
s = read_file_to_str(fname, 0, NULL);
tt_str_op(s, OP_EQ, str1);
tor_free(s);
/* We can replace files. */
rv = write_str_to_file_if_not_equal(fname, str2);
tt_int_op(rv, OP_EQ, 0);
s = read_file_to_str(fname, 0, NULL);
tt_str_op(s, OP_EQ, str2);
tor_free(s);
/* Make sure we don't replace files when they're equal. (That's the whole
* point of the function we're testing. */
/* First, change the mtime of the file so that we can tell whether we
* replaced it. */
const time_t now = time(NULL);
const time_t five_sec_ago = now - 5;
set_file_mtime(fname, five_sec_ago);
rv = write_str_to_file_if_not_equal(fname, str2);
tt_int_op(rv, OP_EQ, 0);
/* Make sure that the file's mtime is unchanged... */
struct stat st;
rv = stat(fname, &st);
tt_int_op(rv, OP_EQ, 0);
tt_i64_op(st.st_mtime, OP_EQ, five_sec_ago);
/* And make sure its contents are unchanged. */
s = read_file_to_str(fname, 0, NULL);
tt_str_op(s, OP_EQ, str2);
tor_free(s);
done:
tor_free(fname);
tor_free(s);
}
#ifndef COCCI
#define _TFE(a, b, f) tt_int_op((a).f, OP_EQ, (b).f)
/** test the minimum set of struct tm fields needed for a unique epoch value
@ -6557,6 +6606,7 @@ struct testcase_t util_tests[] = {
UTIL_TEST(read_file_eof_zero_bytes, 0),
UTIL_TEST(read_file_endlines, 0),
UTIL_TEST(write_chunks_to_file, 0),
UTIL_TEST(write_str_if_changed, 0),
UTIL_TEST(mathlog, 0),
UTIL_TEST(fraction, 0),
UTIL_TEST(weak_random, 0),