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#include "algo/hash.h"
#include "unity.h"
#include <stdint.h>
#include <string.h>
void test_xor_hash_consistency(void) {
uint64_t in[] = {10, 20, 30};
uint64_t actual_1 = xor64_hash(in, 3);
uint64_t actual_2 = xor64_hash(in, 3);
TEST_ASSERT_EQUAL_INT(actual_1, actual_2);
}
void test_xor_hash_empty_src(void) {
uint64_t in[] = {};
uint64_t actual = xor64_hash(in, 0);
TEST_ASSERT_EQUAL_INT(0, actual);
}
void test_xor_hash_single_byte(void) {
uint64_t in_1[] = {5};
uint64_t in_2[] = {10};
uint64_t in_3[] = {15};
uint64_t actual_1 = xor64_hash(in_1, 1);
uint64_t actual_2 = xor64_hash(in_2, 1);
uint64_t actual_3 = xor64_hash(in_3, 1);
TEST_ASSERT_NOT_EQUAL(actual_1, actual_2);
TEST_ASSERT_NOT_EQUAL(actual_1, actual_3);
TEST_ASSERT_NOT_EQUAL(actual_2, actual_3);
}
void test_xor_hash_is_varied(void) {
uint64_t in_1[] = {1, 2, 3};
uint64_t in_2[] = {4, 5, 6};
uint64_t in_3[] = {100, 200, 300};
uint64_t actual_1 = xor64_hash(in_1, 3);
uint64_t actual_2 = xor64_hash(in_2, 3);
uint64_t actual_3 = xor64_hash(in_3, 3);
TEST_ASSERT_NOT_EQUAL(actual_1, actual_2);
TEST_ASSERT_NOT_EQUAL(actual_1, actual_3);
TEST_ASSERT_NOT_EQUAL(actual_2, actual_3);
}
void test_xor_hash_permutation_collisions(void) {
uint64_t in_1[] = {1, 2};
uint64_t in_2[] = {2, 1};
uint64_t actual_1 = xor64_hash(in_1, 2);
uint64_t actual_2 = xor64_hash(in_2, 2);
TEST_ASSERT_EQUAL_INT(actual_1, actual_2);
}
void test_xor_hash_large_src(void) {
uint64_t large_array[100];
for (int i = 0; i < 100; i++) {
large_array[i] = i * 7 + 13;
}
uint64_t actual = xor64_hash(large_array, 100);
TEST_ASSERT_NOT_EQUAL(0, actual);
uint64_t actual_2 = xor64_hash(large_array, 100);
TEST_ASSERT_EQUAL_INT(actual, actual_2);
}
void test_xor_hash_range(void) {
uint64_t in[] = {10, 20, 30, 40, 50};
uint64_t hash_1 = xor64_hash(in, 1);
uint64_t hash_2 = xor64_hash(in, 2);
uint64_t hash_3 = xor64_hash(in, 3);
uint64_t hash_5 = xor64_hash(in, 5);
TEST_ASSERT_NOT_EQUAL(hash_1, hash_2);
TEST_ASSERT_NOT_EQUAL(hash_2, hash_3);
TEST_ASSERT_NOT_EQUAL(hash_3, hash_5);
}
void test_djb2_hash_consistency(void) {
const char *str = "Hello World!";
uint64_t actual_1 = djb2_hash(str, strlen(str));
uint64_t actual_2 = djb2_hash(str, strlen(str));
TEST_ASSERT_EQUAL_UINT64(actual_1, actual_2);
}
void test_djb2_hash_empty_string(void) {
const char *str = "";
uint64_t actual = djb2_hash(str, strlen(str));
TEST_ASSERT_EQUAL_UINT64(5381, actual);
}
void test_djb2_hash_single_char(void) {
uint64_t hash_a = djb2_hash("a", 1);
uint64_t hash_b = djb2_hash("b", 1);
uint64_t hash_z = djb2_hash("z", 1);
TEST_ASSERT_NOT_EQUAL(hash_a, hash_b);
TEST_ASSERT_NOT_EQUAL(hash_b, hash_z);
}
void test_djb2_hash_known_values(void) {
// Pre-calculated djb2 hashes:
// e.g. "a": (5381 * 33) + 'a' = 177573 + 97 = 177670
TEST_ASSERT_EQUAL_UINT64(0x0002b606ULL, djb2_hash("a", 1));
TEST_ASSERT_EQUAL_UINT64(0x0b887389ULL, djb2_hash("foo", 3));
TEST_ASSERT_EQUAL_UINT64(0x310D4F2079ULL, djb2_hash("Hello", 5));
}
void test_djb2_hash_different_strings(void) {
const char *str1 = "apple";
const char *str2 = "banana";
const char *str3 = "orange";
uint64_t hash1 = djb2_hash(str1, strlen(str1));
uint64_t hash2 = djb2_hash(str2, strlen(str2));
uint64_t hash3 = djb2_hash(str3, strlen(str3));
TEST_ASSERT_NOT_EQUAL(hash1, hash2);
TEST_ASSERT_NOT_EQUAL(hash1, hash3);
TEST_ASSERT_NOT_EQUAL(hash2, hash3);
}
void test_djb2_hash_large_string(void) {
char long_str[256];
for (int i = 0; i < 255; i++) {
long_str[i] = 'A' + (i % 26);
}
long_str[255] = '\0';
uint64_t actual = djb2_hash(long_str, strlen(long_str));
TEST_ASSERT_NOT_EQUAL(5381, actual);
TEST_ASSERT_NOT_EQUAL(0, actual);
uint64_t actual_2 = djb2_hash(long_str, strlen(long_str));
TEST_ASSERT_EQUAL_UINT64(actual, actual_2);
}
void test_runner_algo_hash(void) {
RUN_TEST(test_xor_hash_consistency);
RUN_TEST(test_xor_hash_empty_src);
RUN_TEST(test_xor_hash_single_byte);
RUN_TEST(test_xor_hash_is_varied);
RUN_TEST(test_xor_hash_permutation_collisions);
RUN_TEST(test_xor_hash_large_src);
RUN_TEST(test_xor_hash_range);
RUN_TEST(test_djb2_hash_consistency);
RUN_TEST(test_djb2_hash_empty_string);
RUN_TEST(test_djb2_hash_single_char);
RUN_TEST(test_djb2_hash_known_values);
RUN_TEST(test_djb2_hash_different_strings);
RUN_TEST(test_djb2_hash_large_string);
return;
}
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