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tests(string): add unit tests for ssh_string_cmp function

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Signed-off-by: Praneeth Sarode <praneethsarode@gmail.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
Praneeth Sarode
2025-07-09 22:03:14 +05:30
committed by Jakub Jelen
parent 95f8cbc7f0
commit 09155adb19
1 changed files with 128 additions and 0 deletions
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128
tests/unittests/torture_string.c
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@@ -247,6 +247,133 @@ static void torture_ssh_string_burn(void **state)
ssh_string_free(str);
}
static void torture_ssh_string_cmp(void **state)
{
struct ssh_string_struct *str1 = NULL, *str2 = NULL;
const char *test_string1 = "Hello, World!";
const char *test_string2 = "Hello, libssh";
const char *test_string3 = "Hello";
const char *test_string4 = "Apple";
const char data1[] = "Hello\x00World!";
const char data2[] = "Hello\x00libssh";
const char data3[] = "Hello";
int rc;
(void)state;
/* Test comparing two NULL strings - should be equal */
assert_int_equal(ssh_string_cmp(NULL, NULL), 0);
/* Test comparing NULL with non-NULL string - NULL should be less */
str1 = ssh_string_from_char(test_string1);
assert_non_null(str1);
assert_true(ssh_string_cmp(NULL, str1) < 0);
assert_true(ssh_string_cmp(str1, NULL) > 0);
ssh_string_free(str1);
/* Test comparing empty strings */
str1 = ssh_string_from_char("");
str2 = ssh_string_from_char("");
assert_non_null(str1);
assert_non_null(str2);
/* Both empty strings should be equal */
assert_int_equal(ssh_string_cmp(str1, str2), 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing empty string with non-empty string */
str1 = ssh_string_from_char("");
str2 = ssh_string_from_char("test");
assert_non_null(str1);
assert_non_null(str2);
/* Empty string should be less than non-empty string */
assert_true(ssh_string_cmp(str1, str2) < 0);
assert_true(ssh_string_cmp(str2, str1) > 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing strings where one is a prefix of another */
str1 = ssh_string_from_char(test_string1); /* "Hello, World!" */
str2 = ssh_string_from_char(test_string3); /* "Hello" - prefix */
assert_non_null(str1);
assert_non_null(str2);
/* "Hello" is shorter and a prefix, so it should be < "Hello, World!" */
assert_true(ssh_string_cmp(str2, str1) < 0);
assert_true(ssh_string_cmp(str1, str2) > 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing different strings with same length */
str1 = ssh_string_from_char(test_string1); /* "Hello, World!" */
str2 = ssh_string_from_char(test_string2); /* "Hello, libssh" */
assert_non_null(str1);
assert_non_null(str2);
/* "Hello, World!" vs "Hello, libssh" - 'W' < 'l' */
assert_true(ssh_string_cmp(str1, str2) < 0);
assert_true(ssh_string_cmp(str2, str1) > 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing strings with different lengths and different characters */
str1 = ssh_string_from_char(test_string1); /* "Hello, World!" */
str2 = ssh_string_from_char(test_string4); /* "Apple" */
assert_non_null(str1);
assert_non_null(str2);
/* 'A' < 'H' so "Apple" < "Hello, World!" */
assert_true(ssh_string_cmp(str2, str1) < 0);
assert_true(ssh_string_cmp(str1, str2) > 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing identical strings - should be equal */
str1 = ssh_string_from_char(test_string1);
str2 = ssh_string_from_char(test_string1);
assert_non_null(str1);
assert_non_null(str2);
assert_int_equal(ssh_string_cmp(str1, str2), 0);
assert_int_equal(ssh_string_cmp(str2, str1), 0);
ssh_string_free(str1);
ssh_string_free(str2);
/* Test comparing strings with embedded null characters */
str1 = ssh_string_new(sizeof(data1)); /* "Hello\x00World!" */
str2 = ssh_string_new(sizeof(data3)); /* "Hello" */
assert_non_null(str1);
assert_non_null(str2);
rc = ssh_string_fill(str1, data1, sizeof(data1));
assert_int_equal(rc, 0);
rc = ssh_string_fill(str2, data3, sizeof(data3));
assert_int_equal(rc, 0);
/* "Hello\x00World!" > "Hello" because its length is greater */
assert_true(ssh_string_cmp(str1, str2) > 0); /* data1 > data3 */
assert_true(ssh_string_cmp(str2, str1) < 0); /* data3 < data1 */
ssh_string_free(str1);
ssh_string_free(str2);
/* Comparing binary strings with same length, but different characters */
str1 = ssh_string_new(sizeof(data1)); /* "Hello\x00World!" */
str2 = ssh_string_new(sizeof(data2)); /* "Hello\x00libssh" */
assert_non_null(str1);
assert_non_null(str2);
rc = ssh_string_fill(str1, data1, sizeof(data1));
assert_int_equal(rc, 0);
rc = ssh_string_fill(str2, data2, sizeof(data2));
assert_int_equal(rc, 0);
/* 'W' < 'l' so str1 < str2 */
assert_true(ssh_string_cmp(str1, str2) < 0); /* data1 < data2 */
assert_true(ssh_string_cmp(str2, str1) > 0); /* data2 > data1 */
ssh_string_free(str1);
ssh_string_free(str2);
}
int torture_run_tests(void)
{
int rc;
@@ -257,6 +384,7 @@ int torture_run_tests(void)
cmocka_unit_test(torture_ssh_string_to_char),
cmocka_unit_test(torture_ssh_string_copy),
cmocka_unit_test(torture_ssh_string_burn),
cmocka_unit_test(torture_ssh_string_cmp),
};
ssh_init();