test_BatteryController.cpp

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#include "BatteryController.hpp"
#include "MockI2CController.hpp"
#include <gmock/gmock.h>
#include <gtest/gtest.h>
 
using ::testing::_;
using ::testing::NiceMock;
using ::testing::Return;

class BatteryControllerTest : public ::testing::Test
{
protected:
    NiceMock<MockI2CController> mockI2C;
    BatteryController *batteryController;
 
    void SetUp() override { batteryController = new BatteryController(&mockI2C); }
 
    void TearDown() override { delete batteryController; }
};

TEST_F(BatteryControllerTest, Initialization_CallsCalibration)
{
    EXPECT_CALL(mockI2C, writeRegister(0x05, 4096)).Times(1);
    delete batteryController; // Force constructor to be re-run
    batteryController = new BatteryController(&mockI2C);
}

TEST_F(BatteryControllerTest, GetBatteryPercentage_CorrectCalculation)
{
    EXPECT_CALL(mockI2C, readRegister(0x02)).WillOnce(Return(1000)); // Bus voltage raw value
    EXPECT_CALL(mockI2C, readRegister(0x01)).WillOnce(Return(100));  // Shunt voltage raw value
 
    float busVoltage = (1000 >> 3) * 0.004f;
    float shuntVoltage = 100 * 0.01f;
    float loadVoltage = busVoltage + shuntVoltage;
    float expectedPercentage = (loadVoltage - 6.0f) / 2.4f * 100.0f;
 
    if (expectedPercentage > 100.0f)
        expectedPercentage = 100.0f;
    if (expectedPercentage < 0.0f)
        expectedPercentage = 0.0f;
 
    float percentage = batteryController->getBatteryPercentage();
    EXPECT_NEAR(percentage, expectedPercentage, 0.1f);
}