AK: Add some initial unit tests for AK::IntrusiveList

Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/0e63a7255e0
Pull-request: https://github.com/SerenityOS/serenity/pull/6509
Reviewed-by: https://github.com/alimpfard

AK/Tests/CMakeLists.txt

@@ -27,6 +27,7 @@ set(AK_TEST_SOURCES
     TestHex.cpp
     TestIPv4Address.cpp
     TestIndexSequence.cpp
+    TestIntrusiveList.cpp
     TestIntrusiveRedBlackTree.cpp
     TestJSON.cpp
     TestLexicalPath.cpp

AK/Tests/TestIntrusiveList.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2021, Brian Gianforcaro <b.gianfo@gmail.com>
+ * 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 <AK/TestSuite.h>
+
+#include <AK/IntrusiveList.h>
+#include <AK/NonnullOwnPtrVector.h>
+#include <AK/Random.h>
+
+class IntrusiveTestItem {
+public:
+    IntrusiveTestItem() = default;
+
+    IntrusiveListNode<IntrusiveTestItem> m_list_node;
+};
+
+using IntrusiveTestList = IntrusiveList<IntrusiveTestItem, RawPtr<IntrusiveTestItem>, &IntrusiveTestItem::m_list_node>;
+
+TEST_CASE(construct)
+{
+    IntrusiveTestList empty;
+    EXPECT(empty.is_empty());
+}
+
+TEST_CASE(insert)
+{
+    IntrusiveTestList list;
+    list.append(*new IntrusiveTestItem());
+
+    EXPECT(!list.is_empty());
+
+    delete list.take_last();
+}
+
+TEST_CASE(enumeration)
+{
+    constexpr size_t expected_size = 10;
+    IntrusiveTestList list;
+    for (size_t i = 0; i < expected_size; i++) {
+        list.append(*new IntrusiveTestItem());
+    }
+
+    size_t actual_size = 0;
+    for (auto& elem : list) {
+        actual_size++;
+    }
+    EXPECT_EQ(expected_size, actual_size);
+    while (auto elem = list.take_first()) {
+        delete elem;
+    }
+}
+
+TEST_MAIN(IntrusiveList)