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78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Sahan Fernando <sahan.h.fernando@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/QuickSort.h>
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#include <AK/Random.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <stdlib.h>
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const size_t NUM_RUNS = 10;
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struct SortableObject {
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int m_key;
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int m_payload;
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};
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static int compare_sortable_object(void const* a, void const* b)
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{
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int const key1 = static_cast<SortableObject const*>(a)->m_key;
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int const key2 = static_cast<SortableObject const*>(b)->m_key;
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if (key1 < key2) {
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return -1;
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} else if (key1 == key2) {
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return 0;
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} else {
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return 1;
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}
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}
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static int calc_payload_for_pos(size_t pos)
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{
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pos *= 231;
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return pos ^ (pos << 8) ^ (pos << 16) ^ (pos << 24);
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}
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static void shuffle_vec(Vector<SortableObject>& test_objects)
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{
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for (size_t i = 0; i < test_objects.size() * 3; ++i) {
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auto i1 = get_random_uniform(test_objects.size());
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auto i2 = get_random_uniform(test_objects.size());
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swap(test_objects[i1], test_objects[i2]);
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}
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}
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TEST_CASE(quick_sort)
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{
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// Generate vector of SortableObjects in sorted order, with payloads determined by their sorted positions
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Vector<SortableObject> test_objects;
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for (auto i = 0; i < 1024; ++i) {
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test_objects.append({ i * 137, calc_payload_for_pos(i) });
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}
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for (size_t i = 0; i < NUM_RUNS; i++) {
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// Shuffle the vector, then sort it again
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shuffle_vec(test_objects);
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qsort(test_objects.data(), test_objects.size(), sizeof(SortableObject), compare_sortable_object);
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// Check that the objects are sorted by key
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for (auto i = 0u; i + 1 < test_objects.size(); ++i) {
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auto const& key1 = test_objects[i].m_key;
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auto const& key2 = test_objects[i + 1].m_key;
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if (key1 > key2) {
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FAIL(String::formatted("saw key {} before key {}\n", key1, key2));
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}
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}
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// Check that the object's payloads have not been corrupted
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for (auto i = 0u; i < test_objects.size(); ++i) {
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auto const expected = calc_payload_for_pos(i);
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auto const payload = test_objects[i].m_payload;
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if (payload != expected) {
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FAIL(String::formatted("Expected payload {} for pos {}, got payload {}", expected, i, payload));
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}
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}
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}
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}
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