AI 自动生成测试用例

tests/test_alert_manager.cpp

@@ -3,265 +3,370 @@
 #include <vector>
 #include <string>
 
-// Mock for time to ensure deterministic tests
+// Mock the global functions to avoid side effects
-static uint32_t mock_timestamp = 1640995200; // 2022-01-01 00:00:00 UTC
+namespace {
-
+    std::string g_output_buffer;
-class MockTime { 
+    void mock_cout(const std::string& msg) {
-public:
+        g_output_buffer += msg + "\n";
-    static uint32_t getTimestamp() { return mock_timestamp; }
+    }
-    static void setTimestamp(uint32_t t) { mock_timestamp = t; }
+    void mock_cerr(const std::string& msg) {
-};
+        g_output_buffer += msg + "\n";
-
+    }
-// Helper function to compare AlertInfo
-bool operator==(const AlertInfo& a, const AlertInfo& b) {
-    return a.type == b.type &&
-           a.status == b.status &&
-           a.trigger_time == b.trigger_time &&
-           a.acknowledge_time == b.acknowledge_time &&
-           a.resolve_time == b.resolve_time &&
-           a.description == b.description;
 }
 
-// Test fixture
+// Replace std::cout and std::cerr with mocks
+#define cout g_output_buffer
+#define cerr g_output_buffer
+
+// Mock time function for deterministic testing
+static uint32_t mock_time = 1000;
+uint32_t get_mock_time() { return mock_time; }
+
+// Override std::time to use mock_time
+extern "C" {
+    time_t time(time_t* tloc) {
+        if (tloc) *tloc = mock_time;
+        return mock_time;
+    }
+}
+
+// Test fixture for AlertManager
 class AlertManagerTest : public ::testing::Test {
 protected:
-    AlertManager manager;
+    AlertManager alert_manager;
 
     void SetUp() override {
-        mock_timestamp = 1640995200;
+        g_output_buffer.clear();
-        manager.initialize();
+        mock_time = 1000;
     }
 
     void TearDown() override {
-        manager.clearHistory();
+        // Reset state
+        alert_manager.resetAllAlerts();
     }
 };
 
-TEST_F(AlertManagerTest, testAlertManagerDefaultInitialization) {
+// Test case: AlertManager constructor
-    EXPECT_FLOAT_EQ(manager.getAltitudeThresholds().first, 100.0f);
+TEST_F(AlertManagerTest, testAlertManagerConstructorNormalInput) {
-    EXPECT_FLOAT_EQ(manager.getAltitudeThresholds().second, -50.0f);
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 100.0f);
-    EXPECT_TRUE(manager.getActiveAlerts().empty());
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -50.0f);
-    EXPECT_TRUE(manager.getAlertHistory(10).empty());
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
+    EXPECT_TRUE(alert_manager.getAlertHistory(10).empty());
 }
 
-TEST_F(AlertManagerTest, testInitialize) {
+// Test case: AlertManager destructor
-    // No direct output assertion, but verify initialization logic
+TEST_F(AlertManagerTest, testAlertManagerDestructorNormalInput) {
-    // This is tested implicitly via constructor
+    // No specific behavior expected, just ensure no crash
-    EXPECT_NO_FATAL_FAILURE(manager.initialize());
+    // Destructor is tested implicitly by scope
+    EXPECT_NO_FATAL_FAILURE({});
 }
 
-TEST_F(AlertManagerTest, testCheckAltitudeAlertNormal) {
+// Test case: initialize
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testInitializeNormalInput) {
-    manager.checkAltitudeAlert(105.0f, mock_timestamp);
+    alert_manager.initialize();
-    auto alerts = manager.getActiveAlerts();
+    EXPECT_NE(g_output_buffer.find("预警管理器初始化完成"), std::string::npos);
-    EXPECT_EQ(alerts.size(), 1);
+    EXPECT_NE(g_output_buffer.find("默认预警阈值：上限=100米，下限=-50米"), std::string::npos);
-    EXPECT_EQ(alerts[0].type, AlertType::ALTITUDE_UPPER);
-    EXPECT_EQ(alerts[0].status, AlertStatus::ACTIVE);
-    EXPECT_EQ(alerts[0].trigger_time, mock_timestamp);
 }
 
-TEST_F(AlertManagerTest, testCheckAltitudeAlertBelowLower) {
+// Test case: checkAltitudeAlert - normal altitude
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testCheckAltitudeAlertNormalInput) {
-    manager.checkAltitudeAlert(-55.0f, mock_timestamp);
+    alert_manager.checkAltitudeAlert(50.0f, 1000);
-    auto alerts = manager.getActiveAlerts();
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
-    EXPECT_EQ(alerts.size(), 1);
+    EXPECT_FALSE(g_output_buffer.find("高度超过上限阈值") != std::string::npos);
-    EXPECT_EQ(alerts[0].type, AlertType::ALTITUDE_LOWER);
+    EXPECT_FALSE(g_output_buffer.find("高度低于下限阈值") != std::string::npos);
-    EXPECT_EQ(alerts[0].status, AlertStatus::ACTIVE);
 }
 
-TEST_F(AlertManagerTest, testCheckAltitudeAlertResetWhenNormal) {
+// Test case: checkAltitudeAlert - upper threshold exceeded
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testCheckAltitudeAlertUpperThresholdExceeded) {
-    manager.checkAltitudeAlert(105.0f, mock_timestamp); // Trigger upper
+    alert_manager.checkAltitudeAlert(101.0f, 1000);
-    mock_timestamp = 1640995201;
+    auto active_alerts = alert_manager.getActiveAlerts();
-    manager.checkAltitudeAlert(90.0f, mock_timestamp); // Reset
+    EXPECT_EQ(active_alerts.size(), 1);
-    auto alerts = manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
+    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
+    EXPECT_NE(g_output_buffer.find("高度超过上限阈值"), std::string::npos);
+}
+
+// Test case: checkAltitudeAlert - lower threshold exceeded
+TEST_F(AlertManagerTest, testCheckAltitudeAlertLowerThresholdExceeded) {
+    alert_manager.checkAltitudeAlert(-51.0f, 1000);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts.size(), 1);
+    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_LOWER);
+    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
+    EXPECT_NE(g_output_buffer.find("高度低于下限阈值"), std::string::npos);
+}
+
+// Test case: checkAltitudeAlert - recovery from upper threshold
+TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoveryFromUpperThreshold) {
+    alert_manager.checkAltitudeAlert(101.0f, 1000);
+    alert_manager.checkAltitudeAlert(99.0f, 1001);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_TRUE(active_alerts.empty());
+    EXPECT_NE(g_output_buffer.find("预警已解决: 高度上限预警"), std::string::npos);
+}
+
+// Test case: checkAltitudeAlert - recovery from lower threshold
+TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoveryFromLowerThreshold) {
+    alert_manager.checkAltitudeAlert(-51.0f, 1000);
+    alert_manager.checkAltitudeAlert(-49.0f, 1001);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_TRUE(active_alerts.empty());
+    EXPECT_NE(g_output_buffer.find("预警已解决: 高度下限预警"), std::string::npos);
+}
+
+// Test case: setAltitudeThresholds - valid thresholds
+TEST_F(AlertManagerTest, testSetAltitudeThresholdsValidInput) {
+    alert_manager.setAltitudeThresholds(200.0f, -100.0f);
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 200.0f);
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -100.0f);
+    EXPECT_NE(g_output_buffer.find("预警阈值已更新"), std::string::npos);
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
+}
+
+// Test case: setAltitudeThresholds - invalid thresholds
+TEST_F(AlertManagerTest, testSetAltitudeThresholdsInvalidInput) {
+    alert_manager.setAltitudeThresholds(50.0f, 100.0f);
+    EXPECT_NE(g_output_buffer.find("错误：上限阈值必须大于下限阈值。"), std::string::npos);
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 100.0f);
+    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -50.0f);
+}
+
+// Test case: triggerSensorFailure
+TEST_F(AlertManagerTest, testTriggerSensorFailureNormalInput) {
+    alert_manager.triggerSensorFailure(1000);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts.size(), 1);
+    EXPECT_EQ(active_alerts[0].type, AlertType::SENSOR_FAILURE);
+    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
+    EXPECT_NE(g_output_buffer.find("传感器故障"), std::string::npos);
+}
+
+// Test case: triggerLowBattery
+TEST_F(AlertManagerTest, testTriggerLowBatteryNormalInput) {
+    alert_manager.triggerLowBattery(1000, 15.5f);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts.size(), 1);
+    EXPECT_EQ(active_alerts[0].type, AlertType::LOW_BATTERY);
+    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
+    EXPECT_NE(g_output_buffer.find("低电量警告：当前电量15.5%"), std::string::npos);
+}
+
+// Test case: triggerCommunicationError
+TEST_F(AlertManagerTest, testTriggerCommunicationErrorNormalInput) {
+    alert_manager.triggerCommunicationError(1000);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts.size(), 1);
+    EXPECT_EQ(active_alerts[0].type, AlertType::COMMUNICATION_ERROR);
+    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
+    EXPECT_NE(g_output_buffer.find("通信错误"), std::string::npos);
+}
+
+// Test case: acknowledgeAllAlerts
+TEST_F(AlertManagerTest, testAcknowledgeAllAlertsNormalInput) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.triggerLowBattery(1001, 10.0f);
+    alert_manager.acknowledgeAllAlerts(1002);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_TRUE(active_alerts.empty());
+    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
+    EXPECT_NE(g_output_buffer.find("预警已确认: 低电量预警"), std::string::npos);
+}
+
+// Test case: acknowledgeAlert - valid type
+TEST_F(AlertManagerTest, testAcknowledgeAlertValidType) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.acknowledgeAlert(AlertType::SENSOR_FAILURE, 1001);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_TRUE(active_alerts.empty());
+    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
+}
+
+// Test case: acknowledgeAlert - invalid type
+TEST_F(AlertManagerTest, testAcknowledgeAlertInvalidType) {
+    alert_manager.acknowledgeAlert(AlertType::NONE, 1000);
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
+    EXPECT_TRUE(g_output_buffer.empty());
+}
+
+// Test case: resetAlert - active alert
+TEST_F(AlertManagerTest, testResetAlertActiveAlert) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.resetAlert(AlertType::SENSOR_FAILURE);
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_TRUE(active_alerts.empty());
+    EXPECT_NE(g_output_buffer.find("预警已解决: 传感器故障"), std::string::npos);
+}
+
+// Test case: resetAlert - inactive alert
+TEST_F(AlertManagerTest, testResetAlertInactiveAlert) {
+    alert_manager.resetAlert(AlertType::SENSOR_FAILURE);
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
+    EXPECT_TRUE(g_output_buffer.empty());
+}
+
+// Test case: resetAllAlerts
+TEST_F(AlertManagerTest, testResetAllAlertsNormalInput) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.triggerLowBattery(1001, 10.0f);
+    alert_manager.resetAllAlerts();
+    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
+    EXPECT_NE(g_output_buffer.find("所有预警已重置。"), std::string::npos);
+}
+
+// Test case: hasActiveAlerts - no alerts
+TEST_F(AlertManagerTest, testHasActiveAlertsNoAlerts) {
+    EXPECT_FALSE(alert_manager.hasActiveAlerts());
+}
+
+// Test case: hasActiveAlerts - with active alerts
+TEST_F(AlertManagerTest, testHasActiveAlertsWithActiveAlerts) {
+    alert_manager.triggerSensorFailure(1000);
+    EXPECT_TRUE(alert_manager.hasActiveAlerts());
+}
+
+// Test case: hasUnacknowledgedAlerts - no unacknowledged alerts
+TEST_F(AlertManagerTest, testHasUnacknowledgedAlertsNoUnacknowledgedAlerts) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.acknowledgeAllAlerts(1001);
+    EXPECT_FALSE(alert_manager.hasUnacknowledgedAlerts());
+}
+
+// Test case: hasUnacknowledgedAlerts - with unacknowledged alerts
+TEST_F(AlertManagerTest, testHasUnacknowledgedAlertsWithUnacknowledgedAlerts) {
+    alert_manager.triggerSensorFailure(1000);
+    EXPECT_TRUE(alert_manager.hasUnacknowledgedAlerts());
+}
+
+// Test case: getActiveAlerts - empty
+TEST_F(AlertManagerTest, testGetActiveAlertsEmpty) {
+    auto alerts = alert_manager.getActiveAlerts();
     EXPECT_TRUE(alerts.empty());
 }
 
-TEST_F(AlertManagerTest, testSetAltitudeThresholdsValid) {
+// Test case: getActiveAlerts - non-empty
-    manager.setAltitudeThresholds(200.0f, -100.0f);
+TEST_F(AlertManagerTest, testGetActiveAlertsNonEmpty) {
-    auto thresholds = manager.getAltitudeThresholds();
+    alert_manager.triggerSensorFailure(1000);
-    EXPECT_FLOAT_EQ(thresholds.first, 200.0f);
+    auto alerts = alert_manager.getActiveAlerts();
-    EXPECT_FLOAT_EQ(thresholds.second, -100.0f);
-}
-
-TEST_F(AlertManagerTest, testSetAltitudeThresholdsInvalid) {
-    EXPECT_NO_FATAL_FAILURE(manager.setAltitudeThresholds(50.0f, 100.0f));
-    // Should print error, but no crash
-    EXPECT_FLOAT_EQ(manager.getAltitudeThresholds().first, 100.0f);
-    EXPECT_FLOAT_EQ(manager.getAltitudeThresholds().second, -50.0f);
-}
-
-TEST_F(AlertManagerTest, testTriggerSensorFailure) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_EQ(alerts.size(), 1);
-    EXPECT_EQ(alerts[0].type, AlertType::SENSOR_FAILURE);
-    EXPECT_EQ(alerts[0].status, AlertStatus::ACTIVE);
-    EXPECT_EQ(alerts[0].trigger_time, mock_timestamp);
-}
-
-TEST_F(AlertManagerTest, testTriggerLowBattery) {
-    mock_timestamp = 1640995200;
-    manager.triggerLowBattery(mock_timestamp, 15.0f);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_EQ(alerts.size(), 1);
-    EXPECT_EQ(alerts[0].type, AlertType::LOW_BATTERY);
-    EXPECT_EQ(alerts[0].status, AlertStatus::ACTIVE);
-    EXPECT_NE(alerts[0].description.find("15.0%"), std::string::npos);
-}
-
-TEST_F(AlertManagerTest, testTriggerCommunicationError) {
-    mock_timestamp = 1640995200;
-    manager.triggerCommunicationError(mock_timestamp);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_EQ(alerts.size(), 1);
-    EXPECT_EQ(alerts[0].type, AlertType::COMMUNICATION_ERROR);
-    EXPECT_EQ(alerts[0].status, AlertStatus::ACTIVE);
-}
-
-TEST_F(AlertManagerTest, testAcknowledgeAllAlerts) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    manager.triggerLowBattery(mock_timestamp + 1, 10.0f);
-    mock_timestamp = 1640995202;
-    manager.acknowledgeAllAlerts(mock_timestamp);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_TRUE(alerts.empty());
-    EXPECT_EQ(alerts.size(), 0);
-}
-
-TEST_F(AlertManagerTest, testAcknowledgeAlert) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    mock_timestamp = 1640995201;
-    manager.acknowledgeAlert(AlertType::SENSOR_FAILURE, mock_timestamp);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_TRUE(alerts.empty());
-}
-
-TEST_F(AlertManagerTest, testResetAlert) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    manager.resetAlert(AlertType::SENSOR_FAILURE);
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_TRUE(alerts.empty());
-}
-
-TEST_F(AlertManagerTest, testResetAllAlerts) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    manager.triggerLowBattery(mock_timestamp + 1, 10.0f);
-    manager.resetAllAlerts();
-    auto alerts = manager.getActiveAlerts();
-    EXPECT_TRUE(alerts.empty());
-}
-
-TEST_F(AlertManagerTest, testHasActiveAlerts) {
-    EXPECT_FALSE(manager.hasActiveAlerts());
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    EXPECT_TRUE(manager.hasActiveAlerts());
-}
-
-TEST_F(AlertManagerTest, testHasUnacknowledgedAlerts) {
-    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    EXPECT_TRUE(manager.hasUnacknowledgedAlerts());
-    manager.acknowledgeAllAlerts(mock_timestamp + 1);
-    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
-}
-
-TEST_F(AlertManagerTest, testGetActiveAlerts) {
-    mock_timestamp = 1640995200;
-    manager.triggerSensorFailure(mock_timestamp);
-    auto alerts = manager.getActiveAlerts();
     EXPECT_EQ(alerts.size(), 1);
     EXPECT_EQ(alerts[0].type, AlertType::SENSOR_FAILURE);
 }
 
-TEST_F(AlertManagerTest, testGetAlertHistoryMaxCount) {
+// Test case: getAlertHistory - max_count larger than history size
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testGetAlertHistoryMaxCountLargerThanHistorySize) {
-    for (int i = 0; i < 15; ++i) {
+    alert_manager.triggerSensorFailure(1000);
-        manager.triggerSensorFailure(mock_timestamp + i);
+    alert_manager.triggerLowBattery(1001, 10.0f);
-    }
+    auto history = alert_manager.getAlertHistory(10);
-    auto history = manager.getAlertHistory(10);
+    EXPECT_EQ(history.size(), 2);
-    EXPECT_EQ(history.size(), 10);
 }
 
-TEST_F(AlertManagerTest, testGetStatusDescriptionNoAlerts) {
+// Test case: getAlertHistory - max_count smaller than history size
-    std::string desc = manager.getStatusDescription();
+TEST_F(AlertManagerTest, testGetAlertHistoryMaxCountSmallerThanHistorySize) {
+    alert_manager.triggerSensorFailure(1000);
+    alert_manager.triggerLowBattery(1001, 10.0f);
+    alert_manager.triggerCommunicationError(1002);
+    auto history = alert_manager.getAlertHistory(2);
+    EXPECT_EQ(history.size(), 2);
+    EXPECT_EQ(history[0].type, AlertType::COMMUNICATION_ERROR);
+    EXPECT_EQ(history[1].type, AlertType::LOW_BATTERY);
+}
+
+// Test case: getStatusDescription - no active alerts
+TEST_F(AlertManagerTest, testGetStatusDescriptionNoActiveAlerts) {
+    std::string desc = alert_manager.getStatusDescription();
     EXPECT_EQ(desc, "系统状态：正常");
 }
 
-TEST_F(AlertManagerTest, testGetStatusDescriptionWithAlerts) {
+// Test case: getStatusDescription - with active alerts
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testGetStatusDescriptionWithActiveAlerts) {
-    manager.triggerSensorFailure(mock_timestamp);
+    alert_manager.triggerSensorFailure(1000);
-    std::string desc = manager.getStatusDescription();
+    alert_manager.triggerLowBattery(1001, 10.0f);
-    EXPECT_NE(desc.find("有1个活动预警"), std::string::npos);
+    std::string desc = alert_manager.getStatusDescription();
-    EXPECT_NE(desc.find("传感器故障"), std::string::npos);
+    EXPECT_NE(desc.find("系统状态：有2个活动预警"), std::string::npos);
+    EXPECT_NE(desc.find("传感器故障") != std::string::npos);
+    EXPECT_NE(desc.find("低电量预警") != std::string::npos);
 }
 
-TEST_F(AlertManagerTest, testClearHistory) {
+// Test case: clearHistory
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testClearHistoryNormalInput) {
-    manager.triggerSensorFailure(mock_timestamp);
+    alert_manager.triggerSensorFailure(1000);
-    manager.clearHistory();
+    alert_manager.clearHistory();
-    EXPECT_TRUE(manager.getAlertHistory(10).empty());
+    EXPECT_TRUE(alert_manager.getAlertHistory(10).empty());
+    EXPECT_NE(g_output_buffer.find("预警历史记录已清空。"), std::string::npos);
 }
 
-TEST_F(AlertManagerTest, testAddToHistoryLimit) {
+// Test case: addToHistory - within limit
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testAddToHistoryWithinLimit) {
-    for (int i = 0; i < 100; ++i) {
+    AlertInfo alert;
-        manager.triggerSensorFailure(mock_timestamp + i);
+    alert.type = AlertType::SENSOR_FAILURE;
-    }
+    alert.status = AlertStatus::ACTIVE;
-    auto history = manager.getAlertHistory(10);
+    alert.trigger_time = 1000;
-    EXPECT_EQ(history.size(), 10);
+    alert.description = "Test alert";
+    alert_manager.addToHistory(alert);
+    auto history = alert_manager.getAlertHistory(10);
+    EXPECT_EQ(history.size(), 1);
+    EXPECT_EQ(history[0].type, AlertType::SENSOR_FAILURE);
 }
 
-TEST_F(AlertManagerTest, testTriggerAlert) {
+// Test case: addToHistory - exceeding limit
-    mock_timestamp = 1640995200;
+TEST_F(AlertManagerTest, testAddToHistoryExceedingLimit) {
-    manager.triggerAlert(AlertType::SENSOR_FAILURE, mock_timestamp, "Test alert");
+    const int MAX_HISTORY = 5;
-    auto alerts = manager.getActiveAlerts();
+    for (int i = 0; i < MAX_HISTORY + 1; ++i) {
-    EXPECT_EQ(alerts.size(), 1);
+        AlertInfo alert;
-    EXPECT_EQ(alerts[0].description, "Test alert");
+        alert.type = AlertType::SENSOR_FAILURE;
+        alert.status = AlertStatus::ACTIVE;
+        alert.trigger_time = 1000 + i;
+        alert.description = "Test alert";
+        alert_manager.addToHistory(alert);
+    }
+    auto history = alert_manager.getAlertHistory(10);
+    EXPECT_EQ(history.size(), MAX_HISTORY);
+    EXPECT_EQ(history[0].trigger_time, 1001);
 }
 
+// Test case: triggerAlert - basic functionality
+TEST_F(AlertManagerTest, testTriggerAlertBasicFunctionality) {
+    alert_manager.triggerAlert(AlertType::SENSOR_FAILURE, 1000, "Test alert");
+    auto active_alerts = alert_manager.getActiveAlerts();
+    EXPECT_EQ(active_alerts.size(), 1);
+    EXPECT_EQ(active_alerts[0].description, "Test alert");
+    EXPECT_NE(g_output_buffer.find("[预警] 传感器故障: Test alert"), std::string::npos);
+}
+
+// Test case: updateAlertStatus - acknowledged
 TEST_F(AlertManagerTest, testUpdateAlertStatusAcknowledged) {
-    mock_timestamp = 1640995200;
+    alert_manager.triggerSensorFailure(1000);
-    manager.triggerSensorFailure(mock_timestamp);
+    alert_manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::ACKNOWLEDGED, 1001);
-    mock_timestamp = 1640995201;
+    auto active_alerts = alert_manager.getActiveAlerts();
-    manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::ACKNOWLEDGED, mock_timestamp);
+    EXPECT_TRUE(active_alerts.empty());
-    auto alerts = manager.getActiveAlerts();
+    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
-    EXPECT_TRUE(alerts.empty());
 }
 
+// Test case: updateAlertStatus - resolved
 TEST_F(AlertManagerTest, testUpdateAlertStatusResolved) {
-    mock_timestamp = 1640995200;
+    alert_manager.triggerSensorFailure(1000);
-    manager.triggerSensorFailure(mock_timestamp);
+    alert_manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::RESOLVED, 1001);
-    mock_timestamp = 1640995201;
+    auto active_alerts = alert_manager.getActiveAlerts();
-    manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::RESOLVED, mock_timestamp);
+    EXPECT_TRUE(active_alerts.empty());
-    auto alerts = manager.getActiveAlerts();
+    EXPECT_NE(g_output_buffer.find("预警已解决: 传感器故障"), std::string::npos);
-    EXPECT_TRUE(alerts.empty());
 }
 
-TEST_F(AlertManagerTest, testGetAlertTypeName) {
+// Test case: getAlertTypeName - known types
-    EXPECT_EQ(manager.getAlertTypeName(AlertType::ALTITUDE_UPPER), "高度上限预警");
+TEST_F(AlertManagerTest, testGetAlertTypeNameKnownTypes) {
-    EXPECT_EQ(manager.getAlertTypeName(AlertType::NONE), "无");
+    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::ALTITUDE_UPPER), "高度上限预警");
-    EXPECT_EQ(manager.getAlertTypeName(static_cast<AlertType>(99)), "未知预警");
+    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::SENSOR_FAILURE), "传感器故障");
+    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::NONE), "无");
 }
 
-TEST_F(AlertManagerTest, testGetAlertStatusName) {
+// Test case: getAlertStatusName - known statuses
-    EXPECT_EQ(manager.getAlertStatusName(AlertStatus::ACTIVE), "预警中");
+TEST_F(AlertManagerTest, testGetAlertStatusNameKnownStatuses) {
-    EXPECT_EQ(manager.getAlertStatusName(AlertStatus::INACTIVE), "未激活");
+    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::ACTIVE), "预警中");
-    EXPECT_EQ(manager.getAlertStatusName(static_cast<AlertStatus>(99)), "未知状态");
+    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::ACKNOWLEDGED), "已确认");
+    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::RESOLVED), "已解决");
 }
 
-TEST_F(AlertManagerTest, testDestructorDoesNotCrash) {
+// Test case: getAltitudeThresholds - getter method
-    // Verify destructor doesn't throw or crash
+TEST_F(AlertManagerTest, testGetAltitudeThresholdsGetterMethod) {
-    EXPECT_NO_FATAL_FAILURE({
+    auto thresholds = alert_manager.getAltitudeThresholds();
-        AlertManager* mgr = new AlertManager();
+    EXPECT_FLOAT_EQ(thresholds.first, 100.0f);
-        delete mgr;
+    EXPECT_FLOAT_EQ(thresholds.second, -50.0f);
-    });
 }