thermal_state_engine_unittest.cc

// Copyright 2015 The Chromium OS 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 <map>
#include <string>
#include <utility>
#include <vector>

#include "gtest/gtest.h"

#include "thermald/thermal_state_engine.h"
#include "thermald/thermal_zone.h"

using std::make_pair;
using std::string;
using std::vector;

namespace thermald {

static const char *kTemp0Name = "temperature 0";
static const char *kTemp1Name = "temperature 1";

static const int kSt2S0ActThld = 60000;
static const int kSt2S0BotThld = 55000;
static const int kSt2S1ActThld = 70000;
static const int kSt2S1BotThld = 65000;

static const int kSt3S0ActThld = 70000;
static const int kSt3S0BotThld = 65000;
static const int kSt3S1ActThld = 80000;
static const int kSt3S1BotThld = 75000;

static const int kSt4S0ActThld = 80000;
static const int kSt4S0BotThld = 75000;
static const int kSt4S1ActThld = kTempInfinite; // No activation threshold
static const int kSt4S1BotThld = kTemp0K;       // No bottom threshold

static const int kSt5S0ActThld = 90000;
static const int kSt5S0BotThld = 85000;
static const int kSt5S1ActThld = 100000;
static const int kSt5S1BotThld = 95000;

// Test case for ThermalStateEngine monitoring a single temperature.
class ThermalStateEngineSingleTemperatureTest : public testing::Test {
 protected:
  ThermalStateEngineSingleTemperatureTest() : state_engine_(&thermal_zone_) {}

  static void SetUpTestCase();
  static void AddThermalState(int state_id, int activation_threshold,
                              int bottom_threshold);

  static ThermalZone thermal_zone_;
  ThermalStateEngine state_engine_;
};

class ThermalStateEngineSingleTemperatureInitialTransitionTest :
      public ThermalStateEngineSingleTemperatureTest {};

ThermalZone ThermalStateEngineSingleTemperatureTest::thermal_zone_;

void ThermalStateEngineSingleTemperatureTest::AddThermalState(
    int state_id, int activation_threshold, int bottom_threshold) {
  std::unique_ptr<ThermalState> state = std::make_unique<ThermalState>();
  ThermalPointThresholds thresholds;

  state->id = state_id;
  thresholds.activation = activation_threshold;
  thresholds.bottom = bottom_threshold;
  state->thresholds.insert(make_pair(kTemp0Name, thresholds));
  thermal_zone_.states.push_back(std::move(state));
}

void ThermalStateEngineSingleTemperatureTest::SetUpTestCase() {
  thermal_zone_.name = "single temp zone";

  // Set up from higher to lower criticality/temperatures.
  AddThermalState(3, kSt3S0ActThld, kSt3S0BotThld);
  AddThermalState(2, kSt2S0ActThld, kSt2S0BotThld);
  AddThermalState(1, kTemp0K, kTemp0K);
}

// Verify for the initial transition that the lowest temperature state is
// entered if the temperature is below the activation threshold of the next
// state.
TEST_F(ThermalStateEngineSingleTemperatureInitialTransitionTest,
       TemperatureBelowActivationThresholdOfSecondState) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);

  ASSERT_TRUE(rc);
  EXPECT_EQ(1, state_engine_.current_state().id);
}

// Verify for the initial transition that an intermediate state is entered if
// the temperature is at the activation threshold of the state.
TEST_F(ThermalStateEngineSingleTemperatureInitialTransitionTest,
       TemperatureAtActivationThreshold) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);

  ASSERT_TRUE(rc);
  EXPECT_EQ(2, state_engine_.current_state().id);
}

// Verify for the initial transition that an intermediate state is entered if
// the temperature is above the activation threshold of the state and below the
// activation threshold of the next state.
TEST_F(ThermalStateEngineSingleTemperatureInitialTransitionTest,
       TemperatureAboveActivationThreshold) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld - 1);

  ASSERT_TRUE(rc);
  EXPECT_EQ(2, state_engine_.current_state().id);
}

// Verify for the initial transition that the highest temperature state is
// entered if the temperature is at the activation threshold of the state.
TEST_F(ThermalStateEngineSingleTemperatureInitialTransitionTest,
       TemperatureAtActivationThresholdOfHighestState) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);

  ASSERT_TRUE(rc);
  EXPECT_EQ(3, state_engine_.current_state().id);
}

// Verify for the initial transition that the highest temperature state is
// entered if the temperature is above the activation threshold of the state.
TEST_F(ThermalStateEngineSingleTemperatureInitialTransitionTest,
       TemperatureAboveActivationThresholdOfHighestState) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name,
                                              kSt3S0ActThld + 5000);

  ASSERT_TRUE(rc);
  EXPECT_EQ(3, state_engine_.current_state().id);
}

// Verify that no transition to a higher state occurs when the temperature is
// just below the activation threshold of the higher state state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureJustBelowActivationThreshold) {
  bool rc;
  int initial_state;
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld - 1);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that no transition to a lower state occurs when the temperature is
// just above the bottom threshold of the current state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureJustAboveBottomThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0BotThld + 1);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that a higher state is entered when the temperature is at the
// activation threshold of the state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureRisesToActivationThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that a higher state is entered when the temperature is above the
// activation threshold of the state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureRisesAboveActivationThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name,
                                              kSt2S0ActThld + 1000);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that a lower state is entered when the temperature is at the bottom
// threshold of the current state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureDropsToBottomThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0BotThld);

  ASSERT_EQ(3, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that a lower state is entered when the temperature is below
// the bottom threshold of the current state.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       TemperatureDropsBelowBottomThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0BotThld - 1);

  ASSERT_EQ(3, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify [cur_state + 2] is entered directly when the activation
// threshold of that state is reached.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       SuddenTemperatureRise) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(3, state_engine_.current_state().id);
}

// Verify [cur_state - 2] is entered directly when the bottom threshold
// of [cur_state - 1] is reached.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       SuddenTemperatureDrop) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);

  ASSERT_EQ(3, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(1, state_engine_.current_state().id);
}

// Verify that the lowest state is active at a very low temperature.
TEST_F(ThermalStateEngineSingleTemperatureTest,
       VeryLowTemperature) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, -260000);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(1, state_engine_.current_state().id);
}

// Test case for ThermalStateEngine monitoring multiple temperatures.
class ThermalStateEngineMultipleTemperaturesTest : public testing::Test {
 protected:
  ThermalStateEngineMultipleTemperaturesTest()
      : state_engine_(&thermal_zone_) {}

  static void SetUpTestCase();
  static void AddThermalState(int state_id,
                              int activation_threshold_0,
                              int bottom_threshold_0,
                              int activation_threshold_1,
                              int bottom_threshold_1);

  static ThermalZone thermal_zone_;
  ThermalStateEngine state_engine_;
};

class ThermalStateEngineMultipleTemperaturesInitialTransitionTest :
      public ThermalStateEngineMultipleTemperaturesTest {};

class ThermalStateEngineMultipleTemperaturesNoThresholdsTest :
      public ThermalStateEngineMultipleTemperaturesTest {};

ThermalZone ThermalStateEngineMultipleTemperaturesTest::thermal_zone_;

void ThermalStateEngineMultipleTemperaturesTest::AddThermalState(
    int state_id,
    int activation_threshold_0, int bottom_threshold_0,
    int activation_threshold_1, int bottom_threshold_1) {
  std::unique_ptr<ThermalState> state = std::make_unique<ThermalState>();
  ThermalPointThresholds thresholds;

  state->id = state_id;

  thresholds.activation = activation_threshold_0;
  thresholds.bottom = bottom_threshold_0;
  state->thresholds.insert(make_pair(kTemp0Name, thresholds));

  thresholds.activation = activation_threshold_1;
  thresholds.bottom = bottom_threshold_1;
  state->thresholds.insert(make_pair(kTemp1Name, thresholds));

  thermal_zone_.states.push_back(std::move(state));
}

void ThermalStateEngineMultipleTemperaturesTest::SetUpTestCase() {
  thermal_zone_.name = "multi temp zone";

  // Set up from higher to lower criticality/temperatures.
  AddThermalState(5, kSt5S0ActThld, kSt5S0BotThld, kSt5S1ActThld,
                  kSt5S1BotThld);
  AddThermalState(4, kSt4S0ActThld, kSt4S0BotThld, kSt4S1ActThld,
                  kSt4S1BotThld);
  AddThermalState(3, kSt3S0ActThld, kSt3S0BotThld, kSt3S1ActThld,
                  kSt3S1BotThld);
  AddThermalState(2, kSt2S0ActThld, kSt2S0BotThld, kSt2S1ActThld,
                  kSt2S1BotThld);
  AddThermalState(1, kTemp0K, kTemp0K, kTemp0K, kTemp0K);
}

// Verify for the initial transition that the lowest temperature state is
// entered when the first reported temperature is below the activation
// threshold of the next state.
TEST_F(ThermalStateEngineMultipleTemperaturesInitialTransitionTest,
       TemperatureBelowActivationThresholdOfSecondState) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld - 1);

  ASSERT_TRUE(rc);
  EXPECT_EQ(1, state_engine_.current_state().id);
}

// Verify for the initial transition that a the correct thermal state is entered
// when the first reported temperature is at the activation threshold of the
// state (not the lowest temperature state).
TEST_F(ThermalStateEngineMultipleTemperaturesInitialTransitionTest,
       TemperatureAtActivationThreshold) {
  bool rc;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);

  ASSERT_TRUE(rc);
  EXPECT_EQ(2, state_engine_.current_state().id);
}

// Verify for the initial transitions that the lowest temperature state is
// active when all temperatures are below the activation threshold of the next
// state.
TEST_F(ThermalStateEngineMultipleTemperaturesInitialTransitionTest,
       AllTemperaturesBelowActivationThresholdsOfSecondState) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld - 1);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  EXPECT_EQ(1, state_engine_.current_state().id);
}

// Verify that a temperature without any readings is treated as a
// very low temperature.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       TreatsUnkownTemperatureAsVeryLow) {
  bool rc[3];
  int state[2];
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state[0] = state_engine_.current_state().id;
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  state[1] = state_engine_.current_state().id;
  rc[2] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0BotThld);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(2, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(3, state[1]);
  ASSERT_TRUE(rc[2]);
  ASSERT_EQ(2, state_engine_.current_state().id);
}

// Verify that a thermal state is entered when one of the temperatures
// reaches the activation threshold of that state.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       SingleTemperatureAtActivationThreshold) {
  bool rc;
  int initial_state;

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  initial_state = state_engine_.current_state().id;

  rc = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  EXPECT_EQ(2, state_engine_.current_state().id);
}

// Verify that a lower thermal state is entered only when all temperatures
// which were at/above the activation threshold of the current state reach
// the bottom threshold of the current state.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       AllBottomThresholdsMustBeReached) {
  int initial_state;
  bool rc[7];
  int state[6];

  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 just above bottom threshold.
  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld + 1);
  state[0] = state_engine_.current_state().id;
  // Temperature 1 just above bottom threshold.
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld + 1);
  state[1] = state_engine_.current_state().id;
  // Temperature 0 reaches bottom threshold.
  rc[2] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);
  state[2] = state_engine_.current_state().id;
  // Temperature 1 reaches bottom threshold => state 1.
  rc[3] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld);
  state[3] = state_engine_.current_state().id;

  // Only one of the temperatures exceeds activation threshold.

  // Temperature 1 reaches state 2 activation threshold again.
  rc[4] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);
  state[4] = state_engine_.current_state().id;
  // Temperature 1 just above bottom threshold.
  rc[5] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld + 1);
  state[5] = state_engine_.current_state().id;
  // Temperature 1 reaches bottom threshold => state 1.
  rc[6] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(2, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(2, state[1]);
  ASSERT_TRUE(rc[2]);
  ASSERT_EQ(2, state[2]);
  ASSERT_TRUE(rc[3]);
  ASSERT_EQ(1, state[3]);
  ASSERT_TRUE(rc[4]);
  ASSERT_EQ(2, state[4]);
  ASSERT_TRUE(rc[5]);
  ASSERT_EQ(2, state[5]);
  ASSERT_TRUE(rc[6]);
  ASSERT_EQ(1, state_engine_.current_state().id);
}

// Verify that for a transition to a lower state it is sufficient that a
// temperature reaches the bottom threshold of the active state once, it
// may rise afterwards above the threshold as long as it stays below the
// activation threshold of the current state.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       TemperatureRisesAgainAboveBottomThreshold) {
  int initial_state;
  bool rc[3];
  int state[2];

  // Start in state 2, with both temperatures >= activation threshold.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 reaches bottom threshold.
  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);
  state[0] = state_engine_.current_state().id;
  // Temperature 0 rises again, but stays below the activation threshold of
  // state 2.
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  state[1] = state_engine_.current_state().id;
  // Temperature 1 reaches bottom threshold => state 1.
  rc[2] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(2, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(2, state[1]);
  ASSERT_TRUE(rc[2]);
  ASSERT_EQ(1, state_engine_.current_state().id);
}

// Verify that for a transition to a lower state a temperature need to reach
// the bottom threshold again if it rose to the activation threshold after
// the prior drop to the bottom threshold.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       TemperatureRisesToActivationThresholdAfterReachingBottomThreshold) {
  int initial_state;
  bool rc[4];
  int state[3];

  // Start in state 2, with both temperatures at/above activation threshold.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 reaches bottom threshold.
  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);
  state[0] = state_engine_.current_state().id;
  // Temperature 0 rises to the activation threshold.
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state[1] = state_engine_.current_state().id;
  // Temperature 1 reaches bottom threshold.
  rc[2] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld);
  state[2] = state_engine_.current_state().id;
  // Temperature 0 reaches the bottom threshold again => state 1.
  rc[3] =state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(2, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(2, state[1]);
  ASSERT_TRUE(rc[2]);
  ASSERT_EQ(2, state[2]);
  ASSERT_TRUE(rc[3]);
  ASSERT_EQ(1, state_engine_.current_state().id);
}

// Verify [cur_state + 2] is entered directly when an activation
// threshold of that state is reached.
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       SuddenTemperatureRise) {
  bool rc;
  int initial_state;

  // Start in state 1.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld - 1);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld - 1);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 at activation threshold of state 3 => state 3.
  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);

  ASSERT_EQ(1, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(3, state_engine_.current_state().id);
}

// Verify [cur_state - 2] is entered directly when all temperatures
// have reached the bottom thresholds of [cur_state - 1].
TEST_F(ThermalStateEngineMultipleTemperaturesTest,
       SuddenTemperatureDrop) {
  int initial_state;
  bool rc[2];
  int state[2];

  // Start in state 3 with both temperatures >= activation threshold.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt3S1ActThld);
  initial_state = state_engine_.current_state().id;

  // First temperature reaches bottom threshold.
  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0BotThld);
  state[0] = state_engine_.current_state().id;
  // Second temperature reaches bottom threshold => state 1.
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1BotThld);
  state[1] = state_engine_.current_state().id;

  ASSERT_EQ(3, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(3, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(1, state[1]);
}

// Verify that a thermal state without thresholds for a temperature is
// skipped upon changes of only this temperature.
TEST_F(ThermalStateEngineMultipleTemperaturesNoThresholdsTest,
       SkipsStateWithoutThresholds) {
  int initial_state;
  bool rc[3];
  int state[2];

  // Start in state 2, with both temperatures >= activation threshold.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt2S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt2S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 1 just below the activation threshold of state 5 => state 3.
  rc[0] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt5S1ActThld - 1);
  state[0] = state_engine_.current_state().id;
  // Temperature 1 reaches activation threshold of state 5 => state 5.
  rc[1] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt5S1ActThld);
  state[1] = state_engine_.current_state().id;
  // Temperature 1 reaches bottom threshold of state 5 => state 3.
  rc[2] = state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt5S1BotThld);

  ASSERT_EQ(2, initial_state);
  ASSERT_TRUE(rc[0]);
  ASSERT_EQ(3, state[0]);
  ASSERT_TRUE(rc[1]);
  ASSERT_EQ(5, state[1]);
  ASSERT_TRUE(rc[2]);
  ASSERT_EQ(3, state_engine_.current_state().id);
}

// Verify that a thermal state without thresholds for a temperature is
// entered when the activation thresholds of other temperatures are
// reached.
TEST_F(ThermalStateEngineMultipleTemperaturesNoThresholdsTest,
       OtherTemperatureReachesActivationThreshold) {
  bool rc;
  int initial_state;

  // Start in state 3 with both temperatures >= activation threshold.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt3S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt3S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 reaches activation threshold of state 4 => state 4.
  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt4S0ActThld);

  ASSERT_EQ(3, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(4, state_engine_.current_state().id);
}

// Verify that a thermal state without thresholds for a temperature is
// left when the bottom thresholds of other temperatures are reached.
TEST_F(ThermalStateEngineMultipleTemperaturesNoThresholdsTest,
       OtherTemperatureReachesBottomThreshold) {
  bool rc;
  int initial_state;

  // Start in state 4, with temperature 0 at activation threshold and
  // temperature 1 at the activation thresold of state 3.
  state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt4S0ActThld);
  state_engine_.ProcessTemperatureUpdate(kTemp1Name, kSt3S1ActThld);
  initial_state = state_engine_.current_state().id;

  // Temperature 0 reaches bottom threshold of state 4 => state 3.
  rc = state_engine_.ProcessTemperatureUpdate(kTemp0Name, kSt4S0BotThld);

  ASSERT_EQ(4, initial_state);
  ASSERT_TRUE(rc);
  ASSERT_EQ(3, state_engine_.current_state().id);
}

}  // thermald