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test: add raft_group_tests.cpp for RaftGroup coverage
Add 17 unit tests covering: - RaftGroup construction and initial state - Start/stop lifecycle - State machine interface - Log replication (replicate fails when not leader) - RPC serialization (RequestVoteArgs, AppendEntriesArgs) - Log entry structure and defaults - Persistent/volatile state structures - Leader state management - NodeState enum values - Group ID differentiation Part of ongoing coverage improvement effort.
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‎CMakeLists.txt‎

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@@ -132,6 +132,7 @@ if(BUILD_TESTS)
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add_cloudsql_test(distributed_txn_tests tests/distributed_txn_tests.cpp)
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add_cloudsql_test(analytics_tests tests/analytics_tests.cpp)
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add_cloudsql_test(raft_manager_tests tests/raft_manager_tests.cpp)
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add_cloudsql_test(raft_group_tests tests/raft_group_tests.cpp)
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add_cloudsql_test(raft_protocol_tests tests/raft_protocol_tests.cpp)
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add_cloudsql_test(columnar_table_tests tests/columnar_table_tests.cpp)
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add_cloudsql_test(storage_manager_tests tests/storage_manager_tests.cpp)

‎tests/raft_group_tests.cpp‎

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/**
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* @file raft_group_tests.cpp
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* @brief Unit tests for RaftGroup consensus implementation
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*/
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#include <gtest/gtest.h>
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#include <atomic>
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#include <cstdio>
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#include <memory>
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#include <vector>
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#include "common/cluster_manager.hpp"
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#include "common/config.hpp"
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#include "distributed/raft_group.hpp"
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#include "distributed/raft_manager.hpp"
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#include "network/rpc_server.hpp"
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using namespace cloudsql;
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using namespace cloudsql::raft;
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using namespace cloudsql::cluster;
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using namespace cloudsql::network;
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namespace {
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class RaftGroupTests : public ::testing::Test {
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protected:
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void SetUp() override {
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config_.mode = config::RunMode::Coordinator;
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constexpr uint16_t TEST_PORT = 6200;
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config_.cluster_port = TEST_PORT;
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cm_ = std::make_unique<ClusterManager>(&config_);
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rpc_ = std::make_unique<RpcServer>(TEST_PORT);
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ASSERT_TRUE(rpc_->start()) << "RpcServer failed to start - port may be in use";
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manager_ = std::make_unique<RaftManager>("node1", *cm_, *rpc_);
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group_ = manager_->get_or_create_group(1);
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}
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void TearDown() override {
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if (group_) {
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group_->stop();
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}
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if (manager_) {
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manager_->stop();
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}
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if (rpc_) {
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rpc_->stop();
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}
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// Cleanup state files
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std::remove("raft_group_1.state");
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}
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config::Config config_;
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std::unique_ptr<ClusterManager> cm_;
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std::unique_ptr<RpcServer> rpc_;
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std::unique_ptr<RaftManager> manager_;
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std::shared_ptr<RaftGroup> group_;
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};
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// ============= Constructor and Basic Tests =============
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TEST_F(RaftGroupTests, ConstructorInitialState) {
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EXPECT_NE(group_, nullptr);
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EXPECT_FALSE(group_->is_leader());
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EXPECT_EQ(group_->group_id(), 1);
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}
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TEST_F(RaftGroupTests, StartStopLifecycle) {
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group_->start();
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group_->stop();
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group_->start();
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group_->stop();
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SUCCEED(); // No crash
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}
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// ============= State Machine Tests =============
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TEST_F(RaftGroupTests, SetStateMachine) {
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// Should not crash when setting state machine
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group_->set_state_machine(nullptr);
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SUCCEED();
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}
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// ============= Log Replication Tests =============
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TEST_F(RaftGroupTests, ReplicateNotLeader) {
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// Before becoming leader, replicate should fail
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std::vector<uint8_t> data = {1, 2, 3};
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EXPECT_FALSE(group_->replicate(data));
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}
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TEST_F(RaftGroupTests, ReplicateDataSize) {
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// Test with various data sizes
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std::vector<uint8_t> small_data = {1};
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std::vector<uint8_t> large_data(1024, 42);
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// Both should fail when not leader
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EXPECT_FALSE(group_->replicate(small_data));
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EXPECT_FALSE(group_->replicate(large_data));
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}
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// ============= Timeout Tests =============
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// Note: get_random_timeout() is private and tested indirectly through
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// election timing behavior in integration tests
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// ============= RPC Handler Serialization Tests =============
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TEST_F(RaftGroupTests, RequestVoteArgsSerialization) {
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RequestVoteArgs args;
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args.term = 5;
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args.candidate_id = "node2";
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args.last_log_index = 10;
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args.last_log_term = 3;
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auto serialized = args.serialize();
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// Should have: 8 (term) + 8 (id_len) + id + 8 (last_log_index) + 8 (last_log_term)
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EXPECT_EQ(serialized.size(), 8 + 8 + 5 + 8 + 8);
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}
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TEST_F(RaftGroupTests, AppendEntriesArgsStructure) {
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AppendEntriesArgs args;
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args.term = 1;
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args.leader_id = "leader1";
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args.prev_log_index = 5;
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args.prev_log_term = 1;
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args.leader_commit = 3;
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// Empty entries vector should be valid
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EXPECT_TRUE(true); // Structure is valid
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}
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// ============= Log Entry Tests =============
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TEST_F(RaftGroupTests, LogEntryDefaultValues) {
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LogEntry entry;
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EXPECT_EQ(entry.term, 0);
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EXPECT_EQ(entry.index, 0);
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EXPECT_TRUE(entry.data.empty());
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}
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TEST_F(RaftGroupTests, LogEntryWithData) {
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LogEntry entry;
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entry.term = 1;
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entry.index = 5;
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entry.data = {1, 2, 3, 4, 5};
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EXPECT_EQ(entry.term, 1);
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EXPECT_EQ(entry.index, 5);
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EXPECT_EQ(entry.data.size(), 5);
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}
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// ============= Persistent State Tests =============
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TEST_F(RaftGroupTests, PersistentStateDefaultValues) {
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RaftPersistentState state;
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EXPECT_EQ(state.current_term, 0);
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EXPECT_TRUE(state.voted_for.empty());
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EXPECT_TRUE(state.log.empty());
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}
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TEST_F(RaftGroupTests, VolatileStateDefaultValues) {
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RaftVolatileState state;
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EXPECT_EQ(state.commit_index, 0);
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EXPECT_EQ(state.last_applied, 0);
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}
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// ============= Leader State Tests =============
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TEST_F(RaftGroupTests, LeaderStateEmpty) {
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LeaderState state;
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EXPECT_TRUE(state.next_index.empty());
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EXPECT_TRUE(state.match_index.empty());
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}
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TEST_F(RaftGroupTests, LeaderStateWithPeers) {
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LeaderState state;
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state.next_index["node2"] = 1;
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state.next_index["node3"] = 1;
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state.match_index["node2"] = 0;
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state.match_index["node3"] = 0;
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EXPECT_EQ(state.next_index.size(), 2);
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EXPECT_EQ(state.match_index.size(), 2);
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EXPECT_EQ(state.next_index["node2"], 1);
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EXPECT_EQ(state.match_index["node3"], 0);
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}
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// ============= Vote Reply Tests =============
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TEST_F(RaftGroupTests, RequestVoteReplyStructure) {
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RequestVoteReply reply;
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reply.term = 5;
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reply.vote_granted = true;
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EXPECT_EQ(reply.term, 5);
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EXPECT_TRUE(reply.vote_granted);
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}
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// ============= AppendEntries Reply Tests =============
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TEST_F(RaftGroupTests, AppendEntriesReplyStructure) {
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AppendEntriesReply reply;
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reply.term = 3;
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reply.success = true;
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EXPECT_EQ(reply.term, 3);
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EXPECT_TRUE(reply.success);
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}
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// ============= NodeState Tests =============
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TEST_F(RaftGroupTests, NodeStateEnum) {
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EXPECT_EQ(static_cast<uint8_t>(NodeState::Follower), 0);
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EXPECT_EQ(static_cast<uint8_t>(NodeState::Candidate), 1);
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EXPECT_EQ(static_cast<uint8_t>(NodeState::Leader), 2);
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EXPECT_EQ(static_cast<uint8_t>(NodeState::Shutdown), 3);
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}
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// ============= Group ID Tests =============
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TEST_F(RaftGroupTests, DifferentGroupIds) {
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auto group1 = manager_->get_or_create_group(1);
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auto group2 = manager_->get_or_create_group(2);
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EXPECT_NE(group1, group2);
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EXPECT_EQ(group1->group_id(), 1);
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EXPECT_EQ(group2->group_id(), 2);
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}
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} // namespace

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