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+/*************************************************************************/
+/* test_list.h */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#ifndef TEST_LIST_H
+#define TEST_LIST_H
+
+#include "core/list.h"
+
+#include "tests/test_macros.h"
+
+namespace TestList {
+
+static void populate_integers(List<int> &p_list, List<int>::Element *r_elements[], int num_elements) {
+ p_list.clear();
+ for (int i = 0; i < num_elements; ++i) {
+ List<int>::Element *n = p_list.push_back(i);
+ r_elements[i] = n;
+ }
+}
+
+TEST_CASE("[List] Swap adjacent front and back") {
+ List<int> list;
+ List<int>::Element *n[2];
+ populate_integers(list, n, 2);
+
+ list.swap(list.front(), list.back());
+
+ CHECK(list.front()->prev() == nullptr);
+ CHECK(list.front() != list.front()->next());
+
+ CHECK(list.front() == n[1]);
+ CHECK(list.back() == n[0]);
+
+ CHECK(list.back()->next() == nullptr);
+ CHECK(list.back() != list.back()->prev());
+}
+
+TEST_CASE("[List] Swap first adjacent pair") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[0], n[1]);
+
+ CHECK(list.front()->prev() == nullptr);
+ CHECK(list.front() != list.front()->next());
+
+ CHECK(list.front() == n[1]);
+ CHECK(list.front()->next() == n[0]);
+ CHECK(list.back()->prev() == n[2]);
+ CHECK(list.back() == n[3]);
+
+ CHECK(list.back()->next() == nullptr);
+ CHECK(list.back() != list.back()->prev());
+}
+
+TEST_CASE("[List] Swap middle adjacent pair") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[1], n[2]);
+
+ CHECK(list.front()->prev() == nullptr);
+
+ CHECK(list.front() == n[0]);
+ CHECK(list.front()->next() == n[2]);
+ CHECK(list.back()->prev() == n[1]);
+ CHECK(list.back() == n[3]);
+
+ CHECK(list.back()->next() == nullptr);
+}
+
+TEST_CASE("[List] Swap last adjacent pair") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[2], n[3]);
+
+ CHECK(list.front()->prev() == nullptr);
+
+ CHECK(list.front() == n[0]);
+ CHECK(list.front()->next() == n[1]);
+ CHECK(list.back()->prev() == n[3]);
+ CHECK(list.back() == n[2]);
+
+ CHECK(list.back()->next() == nullptr);
+}
+
+TEST_CASE("[List] Swap first cross pair") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[0], n[2]);
+
+ CHECK(list.front()->prev() == nullptr);
+
+ CHECK(list.front() == n[2]);
+ CHECK(list.front()->next() == n[1]);
+ CHECK(list.back()->prev() == n[0]);
+ CHECK(list.back() == n[3]);
+
+ CHECK(list.back()->next() == nullptr);
+}
+
+TEST_CASE("[List] Swap last cross pair") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[1], n[3]);
+
+ CHECK(list.front()->prev() == nullptr);
+
+ CHECK(list.front() == n[0]);
+ CHECK(list.front()->next() == n[3]);
+ CHECK(list.back()->prev() == n[2]);
+ CHECK(list.back() == n[1]);
+
+ CHECK(list.back()->next() == nullptr);
+}
+
+TEST_CASE("[List] Swap edges") {
+ List<int> list;
+ List<int>::Element *n[4];
+ populate_integers(list, n, 4);
+
+ list.swap(n[1], n[3]);
+
+ CHECK(list.front()->prev() == nullptr);
+
+ CHECK(list.front() == n[0]);
+ CHECK(list.front()->next() == n[3]);
+ CHECK(list.back()->prev() == n[2]);
+ CHECK(list.back() == n[1]);
+
+ CHECK(list.back()->next() == nullptr);
+}
+
+TEST_CASE("[List] Swap middle (values check)") {
+ List<String> list;
+ List<String>::Element *n_str1 = list.push_back("Still");
+ List<String>::Element *n_str2 = list.push_back("waiting");
+ List<String>::Element *n_str3 = list.push_back("for");
+ List<String>::Element *n_str4 = list.push_back("Godot.");
+
+ CHECK(n_str1->get() == "Still");
+ CHECK(n_str4->get() == "Godot.");
+
+ CHECK(list.front()->get() == "Still");
+ CHECK(list.front()->next()->get() == "waiting");
+ CHECK(list.back()->prev()->get() == "for");
+ CHECK(list.back()->get() == "Godot.");
+
+ list.swap(n_str2, n_str3);
+
+ CHECK(list.front()->next()->get() == "for");
+ CHECK(list.back()->prev()->get() == "waiting");
+}
+
+TEST_CASE("[List] Swap front and back (values check)") {
+ List<Variant> list;
+ Variant str = "Godot";
+ List<Variant>::Element *n_str = list.push_back(str);
+ Variant color = Color(0, 0, 1);
+ List<Variant>::Element *n_color = list.push_back(color);
+
+ CHECK(list.front()->get() == "Godot");
+ CHECK(list.back()->get() == Color(0, 0, 1));
+
+ list.swap(n_str, n_color);
+
+ CHECK(list.front()->get() == Color(0, 0, 1));
+ CHECK(list.back()->get() == "Godot");
+}
+
+TEST_CASE("[List] Swap adjacent back and front (reverse order of elements)") {
+ List<int> list;
+ List<int>::Element *n[2];
+ populate_integers(list, n, 2);
+
+ list.swap(n[1], n[0]);
+
+ List<int>::Element *it = list.front();
+ while (it) {
+ List<int>::Element *prev_it = it;
+ it = it->next();
+ if (it == prev_it) {
+ FAIL_CHECK("Infinite loop detected.");
+ break;
+ }
+ }
+}
+
+static void swap_random(List<int> &p_list, List<int>::Element *r_elements[], size_t p_size, size_t p_iterations) {
+ Math::seed(0);
+
+ for (size_t test_i = 0; test_i < p_iterations; ++test_i) {
+ // A and B elements have corresponding indices as values.
+ const int a_idx = static_cast<int>(Math::rand() % p_size);
+ const int b_idx = static_cast<int>(Math::rand() % p_size);
+ List<int>::Element *a = p_list.find(a_idx); // via find.
+ List<int>::Element *b = r_elements[b_idx]; // via pointer.
+
+ int va = a->get();
+ int vb = b->get();
+
+ p_list.swap(a, b);
+
+ CHECK(va == a->get());
+ CHECK(vb == b->get());
+
+ size_t element_count = 0;
+
+ // Fully traversable after swap?
+ List<int>::Element *it = p_list.front();
+ while (it) {
+ element_count += 1;
+ List<int>::Element *prev_it = it;
+ it = it->next();
+ if (it == prev_it) {
+ FAIL_CHECK("Infinite loop detected.");
+ break;
+ }
+ }
+ // We should not lose anything in the process.
+ if (element_count != p_size) {
+ FAIL_CHECK("Element count mismatch.");
+ break;
+ }
+ }
+}
+
+TEST_CASE("[Stress][List] Swap random 100 elements, 500 iterations.") {
+ List<int> list;
+ List<int>::Element *n[100];
+ populate_integers(list, n, 100);
+ swap_random(list, n, 100, 500);
+}
+
+TEST_CASE("[Stress][List] Swap random 10 elements, 1000 iterations.") {
+ List<int> list;
+ List<int>::Element *n[10];
+ populate_integers(list, n, 10);
+ swap_random(list, n, 10, 1000);
+}
+
+} // namespace TestList
+
+#endif // TEST_LIST_H
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