Tests: Move AK tests to Tests/AK

Tests/AK/TestNeverDestroyed.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibTest/TestCase.h>
+
+#include <AK/NeverDestroyed.h>
+#include <AK/StdLibExtras.h>
+
+struct Counter {
+    Counter() = default;
+
+    ~Counter() { ++num_destroys; }
+
+    Counter(const Counter&)
+    {
+        ++num_copies;
+    }
+
+    Counter(Counter&&) { ++num_moves; }
+
+    int num_copies {};
+    int num_moves {};
+    int num_destroys {};
+};
+
+TEST_CASE(should_construct_by_copy)
+{
+    Counter c {};
+    AK::NeverDestroyed<Counter> n { c };
+
+    EXPECT_EQ(1, n->num_copies);
+    EXPECT_EQ(0, n->num_moves);
+}
+
+TEST_CASE(should_construct_by_move)
+{
+    Counter c {};
+    AK::NeverDestroyed<Counter> n { move(c) };
+
+    EXPECT_EQ(0, n->num_copies);
+    EXPECT_EQ(1, n->num_moves);
+}
+
+TEST_CASE(should_not_destroy)
+{
+    Counter* c = nullptr;
+    {
+        AK::NeverDestroyed<Counter> n {};
+        c = &n.get();
+    }
+    EXPECT_EQ(0, c->num_destroys);
+}
+
+TEST_CASE(should_provide_dereference_operator)
+{
+    AK::NeverDestroyed<Counter> n {};
+    EXPECT_EQ(0, n->num_destroys);
+}
+
+TEST_CASE(should_provide_indirection_operator)
+{
+    AK::NeverDestroyed<Counter> n {};
+    EXPECT_EQ(0, (*n).num_destroys);
+}
+
+TEST_CASE(should_provide_basic_getter)
+{
+    AK::NeverDestroyed<Counter> n {};
+    EXPECT_EQ(0, n.get().num_destroys);
+}