MCAL Testing & Validation

/* Unit test for Adc_ReadGroup() using register stubs */
/* No real hardware needed: stub ADC result registers */

#include "unity.h"
#include "Adc.h"
#include "Adc_Stub.h"  /* stub: maps ADC register reads to test values */

static Adc_ValueGroupType result_buf[4];

void setUp(void)
{
    Adc_Stub_Reset();
    Adc_Init(&TestAdcConfig);
    Adc_SetupResultBuffer(ADC_GROUP_ENGINE_SENSORS, result_buf);
}

void test_Adc_ReadGroup_ReturnsCorrectValues(void)
{
    /* Arrange: set stub ADC result registers */
    Adc_Stub_SetResult(ADC_CH_TPS,     2048u);  /* 50% = 2.5V */
    Adc_Stub_SetResult(ADC_CH_MAP,     3000u);
    Adc_Stub_SetResult(ADC_CH_COOLANT, 1500u);
    Adc_Stub_SetResult(ADC_CH_O2_PRE,  2200u);

    /* Simulate conversion complete */
    Adc_Stub_TriggerConversionComplete(ADC_GROUP_ENGINE_SENSORS);

    /* Act */
    Std_ReturnType ret = Adc_ReadGroup(ADC_GROUP_ENGINE_SENSORS, result_buf);

    /* Assert */
    TEST_ASSERT_EQUAL(E_OK, ret);
    TEST_ASSERT_EQUAL_UINT16(2048u, result_buf[0]);  /* TPS */
    TEST_ASSERT_EQUAL_UINT16(3000u, result_buf[1]);  /* MAP */
}

void test_Adc_ReadGroup_ReturnsError_WhenGroupNotStarted(void)
{
    /* Group never started -- ReadGroup should fail */
    Std_ReturnType ret = Adc_ReadGroup(ADC_GROUP_UNSTARTERD, result_buf);
    TEST_ASSERT_EQUAL(E_NOT_OK, ret);
}