How do write a unit test code for below code?

void DigitalButton_Process(HalDigitalButton* const pThis)
{
    
    bool isState;
    uint32_t filteredValue;
    uint32_t isDiagnosticStable;
    uint32_t pinVal;
   
    Expect_FatalObjConstructedAndInitialized(pThis);
   
	pinVal = (pThis->pCfg->pFunGetDigitalPinStatus)()? DIGITAL_BUTTON_PIN_STATE_HIGH : DIGITAL_BUTTON_PIN_STATE_LOW;
    MiscFilter_StableFilter_PushValue(pThis->pCfg->pFilter, pinVal);
    isState = MiscFilter_StableFilter_GetFilteredValue(pThis->pCfg->pFilter, &filteredValue);
     
             

    if (isState)
    {
        pThis->data.currentStatus = DigitalButtonStatus_stable;
        /*if the Button is Active low state*/
        if (pThis->pCfg->halDigitalButtonMode)
        {
            if (filteredValue == DIGITAL_BUTTON_PIN_STATE_HIGH)
            {
                pThis->data.currentState = DigitalButtonState_released;
            }
            else if (filteredValue == DIGITAL_BUTTON_PIN_STATE_LOW)
            {
                pThis->data.currentState = DigitalButtonState_pushed;
            }
            else /* invalid value */
            {
                pThis->data.currentState = DigitalButtonState_error;
            }
        }
        else
        {    /*if the Button is Active high state*/
            if (filteredValue == DIGITAL_BUTTON_PIN_STATE_HIGH)
            {
                pThis->data.currentState = DigitalButtonState_pushed;
            }
            else if (filteredValue == DIGITAL_BUTTON_PIN_STATE_LOW)
            {
                pThis->data.currentState = DigitalButtonState_released;
            }
            else /* invalid value */
            {
                pThis->data.currentState = DigitalButtonState_error;
            }
        }
    }
    else
    {  
        pThis->data.currentStatus = DigitalButtonStatus_unstable;
        
    }

TEST_F(HAL_DigitalButton_c, HAL_DigitalButton_Process___isInitialized_is_High)
{
    ConstructAndInit()
    obj->isInitialized = false;
    HAL_DigitalButton_Process(obj);
    EXPECT_EQ(DigitalButtonStatus_unstable, obj->data.currentStatus);
}