Add checks to DEBUG mode that no instance of URLRequest or URLFetcher survive...

base/linked_list_unittest.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/linked_list.h"
+#include "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace {
+
+class Node : public LinkNode<Node> {
+ public:
+  explicit Node(int id) : id_(id) {}
+
+  int id() const { return id_; }
+
+ private:
+  int id_;
+};
+
+// Checks that when iterating |list| (either from head to tail, or from
+// tail to head, as determined by |forward|), we get back |node_ids|,
+// which is an array of size |num_nodes|.
+void ExpectListContentsForDirection(const LinkedList<Node>& list,
+  int num_nodes, const int* node_ids, bool forward) {
+  int i = 0;
+  for (const LinkNode<Node>* node = (forward ? list.head() : list.tail());
+       node != list.end();
+       node = (forward ? node->next() : node->previous())) {
+    ASSERT_LT(i, num_nodes);
+    int index_of_id = forward ? i : num_nodes - i - 1;
+    EXPECT_EQ(node_ids[index_of_id], node->value()->id());
+    ++i;
+  }
+  EXPECT_EQ(num_nodes, i);
+}
+
+void ExpectListContents(const LinkedList<Node>& list,
+                        int num_nodes,
+                        const int* node_ids) {
+  {
+    SCOPED_TRACE("Iterating forward (from head to tail)");
+    ExpectListContentsForDirection(list, num_nodes, node_ids, true);
+  }
+  {
+    SCOPED_TRACE("Iterating backward (from tail to head)");
+    ExpectListContentsForDirection(list, num_nodes, node_ids, false);
+  }
+}
+
+TEST(LinkedList, Empty) {
+  LinkedList<Node> list;
+  EXPECT_EQ(list.end(), list.head());
+  EXPECT_EQ(list.end(), list.tail());
+  ExpectListContents(list, 0, NULL);
+}
+
+
+TEST(LinkedList, Append) {
+  LinkedList<Node> list;
+  ExpectListContents(list, 0, NULL);
+
+  Node n1(1);
+  list.Append(&n1);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n1, list.tail());
+  {
+    const int expected[] = {1};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  Node n2(2);
+  list.Append(&n2);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n2, list.tail());
+  {
+    const int expected[] = {1, 2};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  Node n3(3);
+  list.Append(&n3);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n3, list.tail());
+  {
+    const int expected[] = {1, 2, 3};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+}
+
+TEST(LinkedList, RemoveFromList) {
+  LinkedList<Node> list;
+
+  Node n1(1);
+  Node n2(2);
+  Node n3(3);
+  Node n4(4);
+  Node n5(5);
+
+  list.Append(&n1);
+  list.Append(&n2);
+  list.Append(&n3);
+  list.Append(&n4);
+  list.Append(&n5);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n5, list.tail());
+  {
+    const int expected[] = {1, 2, 3, 4, 5};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  // Remove from the middle.
+  n3.RemoveFromList();
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n5, list.tail());
+  {
+    const int expected[] = {1, 2, 4, 5};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  // Remove from the tail.
+  n5.RemoveFromList();
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n4, list.tail());
+  {
+    const int expected[] = {1, 2, 4};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  // Remove from the head.
+  n1.RemoveFromList();
+
+  EXPECT_EQ(&n2, list.head());
+  EXPECT_EQ(&n4, list.tail());
+  {
+    const int expected[] = {2, 4};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  // Empty the list.
+  n2.RemoveFromList();
+  n4.RemoveFromList();
+
+  ExpectListContents(list, 0, NULL);
+  EXPECT_EQ(list.end(), list.head());
+  EXPECT_EQ(list.end(), list.tail());
+
+  // Fill the list once again.
+  list.Append(&n1);
+  list.Append(&n2);
+  list.Append(&n3);
+  list.Append(&n4);
+  list.Append(&n5);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n5, list.tail());
+  {
+    const int expected[] = {1, 2, 3, 4, 5};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+}
+
+TEST(LinkedList, InsertBefore) {
+  LinkedList<Node> list;
+
+  Node n1(1);
+  Node n2(2);
+  Node n3(3);
+  Node n4(4);
+
+  list.Append(&n1);
+  list.Append(&n2);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n2, list.tail());
+  {
+    const int expected[] = {1, 2};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  n3.InsertBefore(&n2);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n2, list.tail());
+  {
+    const int expected[] = {1, 3, 2};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  n4.InsertBefore(&n1);
+
+  EXPECT_EQ(&n4, list.head());
+  EXPECT_EQ(&n2, list.tail());
+  {
+    const int expected[] = {4, 1, 3, 2};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+}
+
+TEST(LinkedList, InsertAfter) {
+  LinkedList<Node> list;
+
+  Node n1(1);
+  Node n2(2);
+  Node n3(3);
+  Node n4(4);
+
+  list.Append(&n1);
+  list.Append(&n2);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n2, list.tail());
+  {
+    const int expected[] = {1, 2};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  n3.InsertAfter(&n2);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n3, list.tail());
+  {
+    const int expected[] = {1, 2, 3};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+
+  n4.InsertAfter(&n1);
+
+  EXPECT_EQ(&n1, list.head());
+  EXPECT_EQ(&n3, list.tail());
+  {
+    const int expected[] = {1, 4, 2, 3};
+    ExpectListContents(list, arraysize(expected), expected);
+  }
+}
+
+}  // namespace
+}  // namespace base