phosphor-power-supply/test/power_supply_tests.cpp

#include "../power_supply.hpp"
#include "mock.hpp"

#include <xyz/openbmc_project/Common/Device/error.hpp>
#include <xyz/openbmc_project/Common/error.hpp>

#include <gmock/gmock.h>
#include <gtest/gtest.h>

using namespace phosphor::power::psu;
using namespace phosphor::pmbus;

using ::testing::_;
using ::testing::Args;
using ::testing::Assign;
using ::testing::DoAll;
using ::testing::ElementsAre;
using ::testing::NotNull;
using ::testing::Return;
using ::testing::StrEq;

static auto PSUInventoryPath = "/xyz/bmc/inv/sys/chassis/board/powersupply0";
static auto PSUGPIOLineName = "presence-ps0";

struct PMBusExpectations
{
    uint16_t statusWordValue{0x0000};
    uint8_t statusInputValue{0x00};
    uint8_t statusMFRValue{0x00};
    uint8_t statusCMLValue{0x00};
    uint8_t statusVOUTValue{0x00};
    uint8_t statusIOUTValue{0x00};
    uint8_t statusFans12Value{0x00};
    uint8_t statusTempValue{0x00};
};

// Helper function to setup expectations for various STATUS_* commands
void setPMBusExpectations(MockedPMBus& mockPMBus,
                          const PMBusExpectations& expectations)
{
    EXPECT_CALL(mockPMBus, read(STATUS_WORD, _))
        .Times(1)
        .WillOnce(Return(expectations.statusWordValue));

    if (expectations.statusWordValue != 0)
    {
        // If fault bits are on in STATUS_WORD, there will also be a read of
        // STATUS_INPUT, STATUS_MFR, STATUS_CML, STATUS_VOUT (page 0), and
        // STATUS_TEMPERATURE.
        EXPECT_CALL(mockPMBus, read(STATUS_INPUT, _))
            .Times(1)
            .WillOnce(Return(expectations.statusInputValue));
        EXPECT_CALL(mockPMBus, read(STATUS_MFR, _))
            .Times(1)
            .WillOnce(Return(expectations.statusMFRValue));
        EXPECT_CALL(mockPMBus, read(STATUS_CML, _))
            .Times(1)
            .WillOnce(Return(expectations.statusCMLValue));
        // Page will need to be set to 0 to read STATUS_VOUT.
        EXPECT_CALL(mockPMBus, insertPageNum(STATUS_VOUT, 0))
            .Times(1)
            .WillOnce(Return("status0_vout"));
        EXPECT_CALL(mockPMBus, read("status0_vout", _))
            .Times(1)
            .WillOnce(Return(expectations.statusVOUTValue));
        EXPECT_CALL(mockPMBus, read(STATUS_IOUT, _))
            .Times(1)
            .WillOnce(Return(expectations.statusIOUTValue));
        EXPECT_CALL(mockPMBus, read(STATUS_FANS_1_2, _))
            .Times(1)
            .WillOnce(Return(expectations.statusFans12Value));
        EXPECT_CALL(mockPMBus, read(STATUS_TEMPERATURE, _))
            .Times(1)
            .WillOnce(Return(expectations.statusTempValue));
    }
}

class PowerSupplyTests : public ::testing::Test
{
  public:
    PowerSupplyTests() :
        mockedUtil(reinterpret_cast<const MockedUtil&>(getUtils()))
    {
        ON_CALL(mockedUtil, getPresence(_, _)).WillByDefault(Return(false));
    }

    ~PowerSupplyTests() override
    {
        freeUtils();
    }

    const MockedUtil& mockedUtil;
};

TEST_F(PowerSupplyTests, Constructor)
{
    /**
     * @param[in] invpath - String for inventory path to use
     * @param[in] i2cbus - The bus number this power supply is on
     * @param[in] i2caddr - The 16-bit I2C address of the power supply
     * @param[in] gpioLineName - The string for the gpio-line-name to read for
     * presence.
     * @param[in] bindDelay - Time in milliseconds to delay binding the device
     * driver after seeing the presence line go active.
     */
    auto bus = sdbusplus::bus::new_default();

    // Try where inventory path is empty, constructor should fail.
    try
    {
        auto psu =
            std::make_unique<PowerSupply>(bus, "", 3, 0x68, PSUGPIOLineName);
        ADD_FAILURE() << "Should not have reached this line.";
    }
    catch (const std::invalid_argument& e)
    {
        EXPECT_STREQ(e.what(), "Invalid empty inventoryPath");
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }

    // TODO: Try invalid i2c address?

    // Try where gpioLineName is empty.
    try
    {
        auto psu =
            std::make_unique<PowerSupply>(bus, PSUInventoryPath, 3, 0x68, "");
        ADD_FAILURE()
            << "Should not have reached this line. Invalid gpioLineName.";
    }
    catch (const std::invalid_argument& e)
    {
        EXPECT_STREQ(e.what(), "Invalid empty gpioLineName");
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }

    // Test with valid arguments
    // NOT using D-Bus inventory path for presence.
    try
    {
        auto psu = std::make_unique<PowerSupply>(bus, PSUInventoryPath, 3, 0x68,
                                                 PSUGPIOLineName);

        EXPECT_EQ(psu->isPresent(), false);
        EXPECT_EQ(psu->isFaulted(), false);
        EXPECT_EQ(psu->hasCommFault(), false);
        EXPECT_EQ(psu->hasInputFault(), false);
        EXPECT_EQ(psu->hasMFRFault(), false);
        EXPECT_EQ(psu->hasVINUVFault(), false);
        EXPECT_EQ(psu->hasVoutOVFault(), false);
        EXPECT_EQ(psu->hasIoutOCFault(), false);
        EXPECT_EQ(psu->hasVoutUVFault(), false);
        EXPECT_EQ(psu->hasFanFault(), false);
        EXPECT_EQ(psu->hasTempFault(), false);
        EXPECT_EQ(psu->hasPgoodFault(), false);
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }

    // Test with valid arguments
    // TODO: Using D-Bus inventory path for presence.
    try
    {
        // FIXME: How do I get that presenceGPIO.read() in the startup to throw
        // an exception?

        // EXPECT_CALL(mockedUtil, getPresence(_,
        // StrEq(PSUInventoryPath)))
        //    .Times(1);
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }
}

TEST_F(PowerSupplyTests, Analyze)
{
    auto bus = sdbusplus::bus::new_default();

    {
        // If I default to reading the GPIO, I will NOT expect a call to
        // getPresence().

        PowerSupply psu{bus, PSUInventoryPath, 4, 0x69, PSUGPIOLineName};
        MockedGPIOInterface* mockPresenceGPIO =
            static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
        EXPECT_CALL(*mockPresenceGPIO, read()).Times(1).WillOnce(Return(0));

        psu.analyze();
        // By default, nothing should change.
        EXPECT_EQ(psu.isPresent(), false);
        EXPECT_EQ(psu.isFaulted(), false);
        EXPECT_EQ(psu.hasInputFault(), false);
        EXPECT_EQ(psu.hasMFRFault(), false);
        EXPECT_EQ(psu.hasVINUVFault(), false);
        EXPECT_EQ(psu.hasCommFault(), false);
        EXPECT_EQ(psu.hasVoutOVFault(), false);
        EXPECT_EQ(psu.hasIoutOCFault(), false);
        EXPECT_EQ(psu.hasVoutUVFault(), false);
        EXPECT_EQ(psu.hasFanFault(), false);
        EXPECT_EQ(psu.hasTempFault(), false);
        EXPECT_EQ(psu.hasPgoodFault(), false);
    }

    PowerSupply psu2{bus, PSUInventoryPath, 5, 0x6a, PSUGPIOLineName};
    // In order to get the various faults tested, the power supply needs to
    // be present in order to read from the PMBus device(s).
    MockedGPIOInterface* mockPresenceGPIO2 =
        static_cast<MockedGPIOInterface*>(psu2.getPresenceGPIO());
    // Always return 1 to indicate present.
    // Each analyze() call will trigger a read of the presence GPIO.
    EXPECT_CALL(*mockPresenceGPIO2, read()).WillRepeatedly(Return(1));
    // Not present until analyze() does the GPIO read.
    EXPECT_EQ(psu2.isPresent(), false);

    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu2.getPMBus());
    // First analyze() call will trigger missing to present, requiring update
    // to find the new HWMON directory.
    EXPECT_CALL(mockPMBus, findHwmonDir());
    // Presence change from missing to present will trigger write to
    // ON_OFF_CONFIG.
    EXPECT_CALL(mockPMBus, writeBinary(ON_OFF_CONFIG, _, _));
    // Presence change from missing to present will trigger in1_input read
    // in an attempt to get CLEAR_FAULTS called.
    EXPECT_CALL(mockPMBus, read(READ_VIN, _)).Times(1).WillOnce(Return(206000));
    // Change from missing to present will trigger call to update Present
    // property in the inventory
    EXPECT_CALL(mockedUtil, setPresence(_, _, true, _));

    // STATUS_WORD INPUT fault.
    {
        // Start with STATUS_WORD 0x0000. Powered on, no faults.
        // Set expectations for a no fault
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), false);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);

        // Update expectations for STATUS_WORD input fault/warn
        // STATUS_INPUT fault bits ... on.
        expectations.statusWordValue = (status_word::INPUT_FAULT_WARN);
        expectations.statusInputValue = 0x38;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), true);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // STATUS_WORD INPUT/UV fault.
    {
        // First need it to return good status, then the fault
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // Now set fault bits in STATUS_WORD
        expectations.statusWordValue =
            (status_word::INPUT_FAULT_WARN | status_word::VIN_UV_FAULT);
        // STATUS_INPUT fault bits ... on.
        expectations.statusInputValue = 0x38;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), true);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), true);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // STATUS_WORD MFR fault.
    {
        // First need it to return good status, then the fault
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // Now STATUS_WORD with MFR fault bit on.
        expectations.statusWordValue = (status_word::MFR_SPECIFIC_FAULT);
        // STATUS_MFR bits on.
        expectations.statusMFRValue = 0xFF;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), true);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // Temperature fault.
    {
        // First STATUS_WORD with no bits set, then with temperature fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // STATUS_WORD with temperature fault bit on.
        expectations.statusWordValue = (status_word::TEMPERATURE_FAULT_WARN);
        // STATUS_TEMPERATURE with fault bit(s) on.
        expectations.statusTempValue = 0x10;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), true);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // CML fault
    {
        // First STATUS_WORD wit no bits set, then with CML fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // STATUS_WORD with CML fault bit on.
        expectations.statusWordValue = (status_word::CML_FAULT);
        // Turn on STATUS_CML fault bit(s)
        expectations.statusCMLValue = 0xFF;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), true);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // VOUT_OV_FAULT fault
    {
        // First STATUS_WORD with no bits set, then with VOUT/VOUT_OV fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // STATUS_WORD with VOUT/VOUT_OV fault.
        expectations.statusWordValue =
            ((status_word::VOUT_FAULT) | (status_word::VOUT_OV_FAULT));
        // Turn on STATUS_VOUT fault bit(s)
        expectations.statusVOUTValue = 0xA0;
        // STATUS_TEMPERATURE don't care (default)
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), true);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // IOUT_OC_FAULT fault
    {
        // First STATUS_WORD with no bits set, then with IOUT_OC fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // STATUS_WORD with IOUT_OC fault.
        expectations.statusWordValue = status_word::IOUT_OC_FAULT;
        // Turn on STATUS_IOUT fault bit(s)
        expectations.statusIOUTValue = 0x88;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), true);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // VOUT_UV_FAULT
    {
        // First STATUS_WORD with no bits set, then with VOUT fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        // Change STATUS_WORD to indicate VOUT fault.
        expectations.statusWordValue = (status_word::VOUT_FAULT);
        // Turn on STATUS_VOUT fault bit(s)
        expectations.statusVOUTValue = 0x30;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), true);
        EXPECT_EQ(psu2.hasFanFault(), false);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // Fan fault
    {
        // First STATUS_WORD with no bits set, then with fan fault.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        expectations.statusWordValue = (status_word::FAN_FAULT);
        // STATUS_FANS_1_2 with fan 1 warning & fault bits on.
        expectations.statusFans12Value = 0xA0;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isPresent(), true);
        EXPECT_EQ(psu2.isFaulted(), true);
        EXPECT_EQ(psu2.hasInputFault(), false);
        EXPECT_EQ(psu2.hasMFRFault(), false);
        EXPECT_EQ(psu2.hasVINUVFault(), false);
        EXPECT_EQ(psu2.hasCommFault(), false);
        EXPECT_EQ(psu2.hasVoutOVFault(), false);
        EXPECT_EQ(psu2.hasIoutOCFault(), false);
        EXPECT_EQ(psu2.hasVoutUVFault(), false);
        EXPECT_EQ(psu2.hasFanFault(), true);
        EXPECT_EQ(psu2.hasTempFault(), false);
        EXPECT_EQ(psu2.hasPgoodFault(), false);
    }

    // PGOOD/OFF fault. Deglitched, needs to reach DEGLITCH_LIMIT.
    {
        // First STATUS_WORD with no bits set.
        PMBusExpectations expectations;
        setPMBusExpectations(mockPMBus, expectations);
        psu2.analyze();
        EXPECT_EQ(psu2.isFaulted(), false);
        // POWER_GOOD# inactive, and OFF bit on.
        expectations.statusWordValue =
            ((status_word::POWER_GOOD_NEGATED) | (status_word::UNIT_IS_OFF));
        for (auto x = 1; x <= DEGLITCH_LIMIT; x++)
        {
            // STATUS_INPUT, STATUS_MFR, STATUS_CML, STATUS_VOUT, and
            // STATUS_TEMPERATURE: Don't care if bits set or not (defaults).
            setPMBusExpectations(mockPMBus, expectations);
            psu2.analyze();
            EXPECT_EQ(psu2.isPresent(), true);
            if (x < DEGLITCH_LIMIT)
            {
                EXPECT_EQ(psu2.isFaulted(), false);
            }
            else
            {
                EXPECT_EQ(psu2.isFaulted(), true);
            }
            EXPECT_EQ(psu2.hasInputFault(), false);
            EXPECT_EQ(psu2.hasMFRFault(), false);
            EXPECT_EQ(psu2.hasVINUVFault(), false);
            EXPECT_EQ(psu2.hasCommFault(), false);
            EXPECT_EQ(psu2.hasVoutOVFault(), false);
            EXPECT_EQ(psu2.hasVoutUVFault(), false);
            EXPECT_EQ(psu2.hasIoutOCFault(), false);
            EXPECT_EQ(psu2.hasFanFault(), false);
            EXPECT_EQ(psu2.hasTempFault(), false);
            if (x < DEGLITCH_LIMIT)
            {
                EXPECT_EQ(psu2.hasPgoodFault(), false);
            }
            else
            {
                EXPECT_EQ(psu2.hasPgoodFault(), true);
            }
        }
    }

    // TODO: ReadFailure
}

TEST_F(PowerSupplyTests, OnOffConfig)
{
    auto bus = sdbusplus::bus::new_default();
    uint8_t data = 0x15;

    // Test where PSU is NOT present
    try
    {
        // Assume GPIO presence, not inventory presence?
        PowerSupply psu{bus, PSUInventoryPath, 4, 0x69, PSUGPIOLineName};

        MockedGPIOInterface* mockPresenceGPIO =
            static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
        ON_CALL(*mockPresenceGPIO, read()).WillByDefault(Return(0));
        MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
        // Constructor should set initial presence, default read returns 0.
        // If it is not present, I should not be trying to write to it.
        EXPECT_CALL(mockPMBus, writeBinary(_, _, _)).Times(0);
        psu.onOffConfig(data);
    }
    catch (...)
    {}

    // Test where PSU is present
    try
    {
        // Assume GPIO presence, not inventory presence?
        PowerSupply psu{bus, PSUInventoryPath, 5, 0x6a, PSUGPIOLineName};
        MockedGPIOInterface* mockPresenceGPIO =
            static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
        ON_CALL(*mockPresenceGPIO, read()).WillByDefault(Return(1));
        MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
        // TODO: expect setPresence call?
        // updatePresence() private function reads gpio, called by analyze().
        psu.analyze();
        // TODO: ???should I check the filename?
        EXPECT_CALL(mockPMBus,
                    writeBinary(_, ElementsAre(0x15), Type::HwmonDeviceDebug))
            .Times(1);
        psu.onOffConfig(data);
    }
    catch (...)
    {}
}

TEST_F(PowerSupplyTests, ClearFaults)
{
    auto bus = sdbusplus::bus::new_default();
    PowerSupply psu{bus, PSUInventoryPath, 13, 0x68, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    // Each analyze() call will trigger a read of the presence GPIO.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    // Change from missing to present will trigger HWMON directory update.
    EXPECT_CALL(mockPMBus, findHwmonDir());
    // Change from missing to present will trigger ON_OFF_CONFIG write.
    EXPECT_CALL(mockPMBus, writeBinary(ON_OFF_CONFIG, _, _));
    // Presence change from missing to present will trigger in1_input read in
    // an attempt to get CLEAR_FAULTS called.
    EXPECT_CALL(mockPMBus, read(READ_VIN, _)).Times(1).WillOnce(Return(206000));
    // Missing/present call will update Presence in inventory.
    EXPECT_CALL(mockedUtil, setPresence(_, _, true, _));
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.isPresent(), true);
    EXPECT_EQ(psu.isFaulted(), false);
    EXPECT_EQ(psu.hasInputFault(), false);
    EXPECT_EQ(psu.hasMFRFault(), false);
    EXPECT_EQ(psu.hasVINUVFault(), false);
    EXPECT_EQ(psu.hasCommFault(), false);
    EXPECT_EQ(psu.hasVoutOVFault(), false);
    EXPECT_EQ(psu.hasIoutOCFault(), false);
    EXPECT_EQ(psu.hasVoutUVFault(), false);
    EXPECT_EQ(psu.hasFanFault(), false);
    EXPECT_EQ(psu.hasTempFault(), false);
    EXPECT_EQ(psu.hasPgoodFault(), false);

    // STATUS_WORD with fault bits galore!
    expectations.statusWordValue = 0xFFFF;
    // STATUS_INPUT with fault bits on.
    expectations.statusInputValue = 0xFF;
    // STATUS_MFR_SPEFIC with bits on.
    expectations.statusMFRValue = 0xFF;
    // STATUS_CML with bits on.
    expectations.statusCMLValue = 0xFF;
    // STATUS_VOUT with bits on.
    expectations.statusVOUTValue = 0xFF;
    // STATUS_IOUT with bits on.
    expectations.statusIOUTValue = 0xFF;
    // STATUS_FANS_1_2 with bits on.
    expectations.statusFans12Value = 0xFF;
    // STATUS_TEMPERATURE with bits on.
    expectations.statusTempValue = 0xFF;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.isPresent(), true);
    EXPECT_EQ(psu.isFaulted(), true);
    EXPECT_EQ(psu.hasInputFault(), true);
    EXPECT_EQ(psu.hasMFRFault(), true);
    EXPECT_EQ(psu.hasVINUVFault(), true);
    EXPECT_EQ(psu.hasCommFault(), true);
    EXPECT_EQ(psu.hasVoutOVFault(), true);
    EXPECT_EQ(psu.hasIoutOCFault(), true);
    // Cannot have VOUT_OV_FAULT and VOUT_UV_FAULT.
    // Rely on HasVoutUVFault() to verify this sets and clears.
    EXPECT_EQ(psu.hasVoutUVFault(), false);
    EXPECT_EQ(psu.hasFanFault(), true);
    EXPECT_EQ(psu.hasTempFault(), true);
    // pgoodFault is deglitched up to DEGLITCH_LIMIT
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    // DEGLITCH_LIMIT reached for pgoodFault
    EXPECT_EQ(psu.hasPgoodFault(), true);

    EXPECT_CALL(mockPMBus, read("in1_input", _))
        .Times(1)
        .WillOnce(Return(209000));
    psu.clearFaults();
    EXPECT_EQ(psu.isPresent(), true);
    EXPECT_EQ(psu.isFaulted(), false);
    EXPECT_EQ(psu.hasInputFault(), false);
    EXPECT_EQ(psu.hasMFRFault(), false);
    EXPECT_EQ(psu.hasVINUVFault(), false);
    EXPECT_EQ(psu.hasCommFault(), false);
    EXPECT_EQ(psu.hasVoutOVFault(), false);
    EXPECT_EQ(psu.hasIoutOCFault(), false);
    EXPECT_EQ(psu.hasVoutUVFault(), false);
    EXPECT_EQ(psu.hasFanFault(), false);
    EXPECT_EQ(psu.hasTempFault(), false);
    EXPECT_EQ(psu.hasPgoodFault(), false);

    // TODO: Faults clear on missing/present?
}

TEST_F(PowerSupplyTests, UpdateInventory)
{
    auto bus = sdbusplus::bus::new_default();

    try
    {
        PowerSupply psu{bus, PSUInventoryPath, 3, 0x68, PSUGPIOLineName};
        MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
        // If it is not present, I should not be trying to read a string
        EXPECT_CALL(mockPMBus, readString(_, _)).Times(0);
        psu.updateInventory();
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }

    try
    {
        PowerSupply psu{bus, PSUInventoryPath, 13, 0x69, PSUGPIOLineName};
        MockedGPIOInterface* mockPresenceGPIO =
            static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
        // GPIO read return 1 to indicate present.
        EXPECT_CALL(*mockPresenceGPIO, read()).Times(1).WillOnce(Return(1));
        psu.analyze();
        MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
        EXPECT_CALL(mockPMBus, readString(_, _)).WillRepeatedly(Return(""));
        psu.updateInventory();

#if IBM_VPD
        EXPECT_CALL(mockPMBus, readString(_, _))
            .WillOnce(Return("CCIN"))
            .WillOnce(Return("PN3456"))
            .WillOnce(Return("FN3456"))
            .WillOnce(Return("HEADER"))
            .WillOnce(Return("SN3456"))
            .WillOnce(Return("FW3456"));
#endif
        psu.updateInventory();
        // TODO: D-Bus mocking to verify values stored on D-Bus (???)
    }
    catch (...)
    {
        ADD_FAILURE() << "Should not have caught exception.";
    }
}

TEST_F(PowerSupplyTests, IsPresent)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x68, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    EXPECT_EQ(psu.isPresent(), false);

    // Change GPIO read to return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).Times(1).WillOnce(Return(1));
    psu.analyze();
    EXPECT_EQ(psu.isPresent(), true);
}

TEST_F(PowerSupplyTests, IsFaulted)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 11, 0x6f, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    EXPECT_EQ(psu.isFaulted(), false);
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    PMBusExpectations expectations;
    // STATUS_WORD with fault bits on.
    expectations.statusWordValue = 0xFFFF;
    // STATUS_INPUT with fault bits on.
    expectations.statusInputValue = 0xFF;
    // STATUS_MFR_SPECIFIC with faults bits on.
    expectations.statusMFRValue = 0xFF;
    // STATUS_CML with faults bits on.
    expectations.statusCMLValue = 0xFF;
    // STATUS_VOUT with fault bits on.
    expectations.statusVOUTValue = 0xFF;
    // STATUS_IOUT with fault bits on.
    expectations.statusIOUTValue = 0xFF;
    // STATUS_FANS_1_2 with bits on.
    expectations.statusFans12Value = 0xFF;
    // STATUS_TEMPERATURE with fault bits on.
    expectations.statusTempValue = 0xFF;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.isFaulted(), true);
}

TEST_F(PowerSupplyTests, HasInputFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x68, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasInputFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasInputFault(), false);
    // STATUS_WORD with input fault/warn on.
    expectations.statusWordValue = (status_word::INPUT_FAULT_WARN);
    // STATUS_INPUT with an input fault bit on.
    expectations.statusInputValue = 0x80;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasInputFault(), true);
    // STATUS_WORD with no bits on.
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasInputFault(), false);
}

TEST_F(PowerSupplyTests, HasMFRFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x68, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasMFRFault(), false);
    // First return STATUS_WORD with no bits on.
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasMFRFault(), false);
    // Next return STATUS_WORD with MFR fault bit on.
    expectations.statusWordValue = (status_word::MFR_SPECIFIC_FAULT);
    // STATUS_MFR_SPEFIC with bit(s) on.
    expectations.statusMFRValue = 0xFF;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasMFRFault(), true);
    // Back to no bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasMFRFault(), false);
}

TEST_F(PowerSupplyTests, HasVINUVFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x68, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasVINUVFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVINUVFault(), false);
    // Turn fault on.
    expectations.statusWordValue = (status_word::VIN_UV_FAULT);
    // Curious disagreement between PMBus Spec. Part II Figure 16 and 33. Go by
    // Figure 16, and assume bits on in STATUS_INPUT.
    expectations.statusInputValue = 0x18;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVINUVFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVINUVFault(), false);
}

TEST_F(PowerSupplyTests, HasVoutOVFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x69, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasVoutOVFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutOVFault(), false);
    // Turn fault on.
    expectations.statusWordValue = (status_word::VOUT_OV_FAULT);
    // STATUS_VOUT fault bit(s)
    expectations.statusVOUTValue = 0x80;
    // STATUS_TEMPERATURE default.
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutOVFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutOVFault(), false);
}

TEST_F(PowerSupplyTests, HasIoutOCFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x6d, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasIoutOCFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasIoutOCFault(), false);
    // Turn fault on.
    expectations.statusWordValue = status_word::IOUT_OC_FAULT;
    // STATUS_IOUT fault bit(s)
    expectations.statusIOUTValue = 0x88;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasIoutOCFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasIoutOCFault(), false);
}

TEST_F(PowerSupplyTests, HasVoutUVFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x6a, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasVoutUVFault(), false);
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutUVFault(), false);
    // Turn fault on.
    expectations.statusWordValue = (status_word::VOUT_FAULT);
    // STATUS_VOUT fault bit(s)
    expectations.statusVOUTValue = 0x30;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutUVFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasVoutUVFault(), false);
}

TEST_F(PowerSupplyTests, HasFanFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x6d, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasFanFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasFanFault(), false);
    // Turn fault on.
    expectations.statusWordValue = (status_word::FAN_FAULT);
    // STATUS_FANS_1_2 fault bit on (Fan 1 Fault)
    expectations.statusFans12Value = 0x80;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasFanFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasFanFault(), false);
}

TEST_F(PowerSupplyTests, HasTempFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x6a, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    psu.analyze();
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_EQ(psu.hasTempFault(), false);
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasTempFault(), false);
    // Turn fault on.
    expectations.statusWordValue = (status_word::TEMPERATURE_FAULT_WARN);
    // STATUS_TEMPERATURE fault bit on (OT Fault)
    expectations.statusTempValue = 0x80;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasTempFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasTempFault(), false);
}

TEST_F(PowerSupplyTests, HasPgoodFault)
{
    auto bus = sdbusplus::bus::new_default();

    PowerSupply psu{bus, PSUInventoryPath, 3, 0x6b, PSUGPIOLineName};
    MockedGPIOInterface* mockPresenceGPIO =
        static_cast<MockedGPIOInterface*>(psu.getPresenceGPIO());
    // Always return 1 to indicate present.
    EXPECT_CALL(*mockPresenceGPIO, read()).WillRepeatedly(Return(1));
    MockedPMBus& mockPMBus = static_cast<MockedPMBus&>(psu.getPMBus());
    EXPECT_CALL(mockPMBus, findHwmonDir());
    // Presence change from missing to present will trigger write to
    // ON_OFF_CONFIG.
    EXPECT_CALL(mockPMBus, writeBinary(ON_OFF_CONFIG, _, _));
    // Missing/present will trigger read of "in1_input" to try CLEAR_FAULTS.
    EXPECT_CALL(mockPMBus, read("in1_input", _))
        .Times(1)
        .WillOnce(Return(207000));
    // Missing/present call will update Presence in inventory.
    EXPECT_CALL(mockedUtil, setPresence(_, _, true, _));
    // STATUS_WORD 0x0000 is powered on, no faults.
    PMBusExpectations expectations;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
    // Turn PGOOD# off (fault on).
    expectations.statusWordValue = (status_word::POWER_GOOD_NEGATED);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    // Expect false until reaches DEGLITCH_LIMIT
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    // Expect false until reaches DEGLITCH_LIMIT
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    // DEGLITCH_LIMIT reached, expect true.
    EXPECT_EQ(psu.hasPgoodFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
    // Turn OFF bit on
    expectations.statusWordValue = (status_word::UNIT_IS_OFF);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), true);
    // Back to no fault bits on in STATUS_WORD
    expectations.statusWordValue = 0;
    setPMBusExpectations(mockPMBus, expectations);
    psu.analyze();
    EXPECT_EQ(psu.hasPgoodFault(), false);
}