Extract DependencyGraph from ProfileDependencyManager.

chrome/browser/profiles/dependency_graph_unittest.cc

+// Copyright 2013 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 "chrome/browser/profiles/dependency_graph.h"
+#include "chrome/browser/profiles/dependency_node.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class DependencyGraphTest : public testing::Test {
+};
+
+class DummyNode : public DependencyNode {
+ public:
+  explicit DummyNode(DependencyGraph* graph) : dependency_graph_(graph) {
+    dependency_graph_->AddNode(this);
+  }
+
+  ~DummyNode() {
+    dependency_graph_->RemoveNode(this);
+  }
+
+ private:
+  DependencyGraph* dependency_graph_;
+
+  DISALLOW_COPY_AND_ASSIGN(DummyNode);
+};
+
+// Tests that we can deal with a single component.
+TEST_F(DependencyGraphTest, SingleCase) {
+  DependencyGraph graph;
+  DummyNode node(&graph);
+
+  std::vector<DependencyNode*> construction_order;
+  EXPECT_TRUE(graph.GetConstructionOrder(&construction_order));
+  ASSERT_EQ(1U, construction_order.size());
+  EXPECT_EQ(&node, construction_order[0]);
+
+  std::vector<DependencyNode*> destruction_order;
+  EXPECT_TRUE(graph.GetDestructionOrder(&destruction_order));
+  ASSERT_EQ(1U, destruction_order.size());
+  EXPECT_EQ(&node, destruction_order[0]);
+}
+
+// Tests that we get a simple one component depends on the other case.
+TEST_F(DependencyGraphTest, SimpleDependency) {
+  DependencyGraph graph;
+  DummyNode parent(&graph);
+  DummyNode child(&graph);
+
+  graph.AddEdge(&parent, &child);
+
+  std::vector<DependencyNode*> construction_order;
+  EXPECT_TRUE(graph.GetConstructionOrder(&construction_order));
+  ASSERT_EQ(2U, construction_order.size());
+  EXPECT_EQ(&parent, construction_order[0]);
+  EXPECT_EQ(&child, construction_order[1]);
+
+  std::vector<DependencyNode*> destruction_order;
+  EXPECT_TRUE(graph.GetDestructionOrder(&destruction_order));
+  ASSERT_EQ(2U, destruction_order.size());
+  EXPECT_EQ(&child, destruction_order[0]);
+  EXPECT_EQ(&parent, destruction_order[1]);
+}
+
+// Tests two children, one parent.
+TEST_F(DependencyGraphTest, TwoChildrenOneParent) {
+  DependencyGraph graph;
+  DummyNode parent(&graph);
+  DummyNode child1(&graph);
+  DummyNode child2(&graph);
+
+  graph.AddEdge(&parent, &child1);
+  graph.AddEdge(&parent, &child2);
+
+  std::vector<DependencyNode*> construction_order;
+  EXPECT_TRUE(graph.GetConstructionOrder(&construction_order));
+  ASSERT_EQ(3U, construction_order.size());
+  EXPECT_EQ(&parent, construction_order[0]);
+  EXPECT_EQ(&child1, construction_order[1]);
+  EXPECT_EQ(&child2, construction_order[2]);
+
+  std::vector<DependencyNode*> destruction_order;
+  EXPECT_TRUE(graph.GetDestructionOrder(&destruction_order));
+  ASSERT_EQ(3U, destruction_order.size());
+  EXPECT_EQ(&child2, destruction_order[0]);
+  EXPECT_EQ(&child1, destruction_order[1]);
+  EXPECT_EQ(&parent, destruction_order[2]);
+}
+
+// Tests an M configuration.
+TEST_F(DependencyGraphTest, MConfiguration) {
+  DependencyGraph graph;
+
+  DummyNode parent1(&graph);
+  DummyNode parent2(&graph);
+
+  DummyNode child_of_1(&graph);
+  graph.AddEdge(&parent1, &child_of_1);
+
+  DummyNode child_of_12(&graph);
+  graph.AddEdge(&parent1, &child_of_12);
+  graph.AddEdge(&parent2, &child_of_12);
+
+  DummyNode child_of_2(&graph);
+  graph.AddEdge(&parent2, &child_of_2);
+
+  std::vector<DependencyNode*> construction_order;
+  EXPECT_TRUE(graph.GetConstructionOrder(&construction_order));
+  ASSERT_EQ(5U, construction_order.size());
+  EXPECT_EQ(&parent1, construction_order[0]);
+  EXPECT_EQ(&parent2, construction_order[1]);
+  EXPECT_EQ(&child_of_1, construction_order[2]);
+  EXPECT_EQ(&child_of_12, construction_order[3]);
+  EXPECT_EQ(&child_of_2, construction_order[4]);
+
+  std::vector<DependencyNode*> destruction_order;
+  EXPECT_TRUE(graph.GetDestructionOrder(&destruction_order));
+  ASSERT_EQ(5U, destruction_order.size());
+  EXPECT_EQ(&child_of_2, destruction_order[0]);
+  EXPECT_EQ(&child_of_12, destruction_order[1]);
+  EXPECT_EQ(&child_of_1, destruction_order[2]);
+  EXPECT_EQ(&parent2, destruction_order[3]);
+  EXPECT_EQ(&parent1, destruction_order[4]);
+}
+
+// Tests that it can deal with a simple diamond.
+TEST_F(DependencyGraphTest, DiamondConfiguration) {
+  DependencyGraph graph;
+
+  DummyNode parent(&graph);
+
+  DummyNode middle1(&graph);
+  graph.AddEdge(&parent, &middle1);
+
+  DummyNode middle2(&graph);
+  graph.AddEdge(&parent, &middle2);
+
+  DummyNode bottom(&graph);
+  graph.AddEdge(&middle1, &bottom);
+  graph.AddEdge(&middle2, &bottom);
+
+  std::vector<DependencyNode*> construction_order;
+  EXPECT_TRUE(graph.GetConstructionOrder(&construction_order));
+  ASSERT_EQ(4U, construction_order.size());
+  EXPECT_EQ(&parent, construction_order[0]);
+  EXPECT_EQ(&middle1, construction_order[1]);
+  EXPECT_EQ(&middle2, construction_order[2]);
+  EXPECT_EQ(&bottom, construction_order[3]);
+
+  std::vector<DependencyNode*> destruction_order;
+  EXPECT_TRUE(graph.GetDestructionOrder(&destruction_order));
+  ASSERT_EQ(4U, destruction_order.size());
+  EXPECT_EQ(&bottom, destruction_order[0]);
+  EXPECT_EQ(&middle2, destruction_order[1]);
+  EXPECT_EQ(&middle1, destruction_order[2]);
+  EXPECT_EQ(&parent, destruction_order[3]);
+}
+
+}  // namespace