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// Copyright 2014 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 "components/keyed_service/core/dependency_graph.h"
#include "components/keyed_service/core/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
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