diff -r aa17be68fc66 -r cf2f209b9da2 tests/test_tree.cpp
--- a/tests/test_tree.cpp	Tue Jun 20 19:13:31 2023 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,122 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   1. Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *
- *   2. Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "cx/tree.h"
-#include <gtest/gtest.h>
-
-struct TestNode {
-    TestNode *parent = nullptr;
-    TestNode *prev = nullptr;
-    TestNode *next = nullptr;
-
-    TestNode *children_begin = nullptr;
-    TestNode *children_end = nullptr;
-};
-
-TEST(Tree, cx_tree_add_sibling) {
-    // prepare test tree
-    TestNode root, a;
-    root.children_begin = &a;
-    root.children_end = &a;
-    a.parent = &root;
-
-    // new test nodes
-    TestNode b, c;
-
-    // test
-    cx_tree_add_sibling(&a, offsetof(TestNode, prev), offsetof(TestNode, next), offsetof(TestNode, parent), &b);
-    EXPECT_EQ(b.parent, &root);
-    EXPECT_EQ(b.prev, &a);
-    EXPECT_EQ(b.next, nullptr);
-    EXPECT_EQ(a.next, &b);
-
-    cx_tree_add_sibling(&a, -1, offsetof(TestNode, next), -1, &c);
-    EXPECT_EQ(c.parent, nullptr);
-    EXPECT_EQ(c.prev, nullptr);
-    EXPECT_EQ(c.next, nullptr);
-    EXPECT_EQ(b.next, &c);
-}
-
-TEST(Tree, cx_tree_add_child) {
-    TestNode root, a, b, c, a1;
-
-    cx_tree_add_child(
-            (void **) &root.children_begin,
-            (void **) &root.children_end,
-            offsetof(TestNode, prev),
-            offsetof(TestNode, next),
-            &a,
-            offsetof(TestNode, parent),
-            &root);
-    EXPECT_EQ(root.children_begin, &a);
-    EXPECT_EQ(root.children_end, &a);
-    EXPECT_EQ(a.parent, &root);
-    EXPECT_EQ(a.prev, nullptr);
-    EXPECT_EQ(a.next, nullptr);
-
-    cx_tree_add_child(
-            (void **) &root.children_begin,
-            (void **) &root.children_end,
-            offsetof(TestNode, prev),
-            offsetof(TestNode, next),
-            &b,
-            offsetof(TestNode, parent),
-            &root);
-    EXPECT_EQ(root.children_begin, &a);
-    EXPECT_EQ(root.children_begin->next, &b);
-    EXPECT_EQ(root.children_end, &b);
-    EXPECT_EQ(b.parent, &root);
-    EXPECT_EQ(b.prev, &a);
-
-    cx_tree_add_child(
-            (void **) &root.children_begin,
-            nullptr,
-            -1,
-            offsetof(TestNode, next),
-            &c,
-            -1,
-            &root);
-    EXPECT_EQ(root.children_end, &b); // children_end unchanged
-    EXPECT_EQ(b.next, &c);
-    EXPECT_EQ(c.prev, nullptr);
-    EXPECT_EQ(c.next, nullptr);
-    EXPECT_EQ(c.parent, nullptr);
-
-    cx_tree_add_child(
-            (void **) &a.children_begin,
-            (void **) &a.children_end,
-            offsetof(TestNode, prev),
-            offsetof(TestNode, next),
-            &a1,
-            offsetof(TestNode, parent),
-            &a);
-    EXPECT_EQ(a.children_begin, &a1);
-    EXPECT_EQ(a1.parent, &a);
-    EXPECT_EQ(root.children_begin, &a);
-    EXPECT_EQ(root.children_begin->children_begin, &a1);
-}