#include "unity.h"
#include "stack.h"

int data1 = 10;
int data2 = 20;
int data3 = 30;

StackNode *stack = NULL;

void setUp(void)
{
    // set stuff up here
}

void tearDown(void)
{
    clearStack(stack);
}

void test_push_and_pop(void)
{
    stack = push(stack, &data1);
    stack = push(stack, &data2);
    stack = push(stack, &data3);

    TEST_ASSERT_EQUAL_PTR(top(stack), &data3);
    stack = pop(stack);
    TEST_ASSERT_EQUAL_PTR(top(stack), &data2);
    stack = pop(stack);
    TEST_ASSERT_EQUAL_PTR(top(stack), &data1);
    stack = pop(stack);
}

void test_handle_NULL(void)
{
    TEST_ASSERT_NULL(pop(stack));
    TEST_ASSERT_NULL(top(stack));
}

int main(void)
{
    printf("============================\nStack tests\n============================\n");
    UNITY_BEGIN();
    RUN_TEST(test_push_and_pop);
    RUN_TEST(test_handle_NULL);
    return UNITY_END();
}