#include <stdlib.h>
#include "stack.h"
#include "unity.h"

void test_push_and_top(void);

void test_pop(void);

void test_clearStack(void);

void setUp(void) {}

void tearDown(void) {}


int main(void)
{
    UNITY_BEGIN();

    RUN_TEST(test_push_and_top);
    RUN_TEST(test_pop);
    RUN_TEST(test_clearStack);

    return UNITY_END();
}


void test_push_and_top(void)
{
    StackNode *stack = NULL;

    int a = 10;
    int b = 20;
    int c = 30;

    stack = push(stack, &a);
    stack = push(stack, &b);
    stack = push(stack, &c);

    TEST_ASSERT_EQUAL_INT(30, *(int*)top(stack));

    clearStack(&stack);
    TEST_ASSERT_NULL(stack);
}

void test_pop(void)
{
    StackNode *stack = NULL;

    int x = 111;
    int y = 222;

    stack = push(stack, &x);
    stack = push(stack, &y);

    // pop removes y
    stack = pop(stack);
    TEST_ASSERT_EQUAL_INT(111, *(int*)top(stack));

    // pop removes x
    stack = pop(stack);
    TEST_ASSERT_NULL(stack);
}

void test_clearStack(void)
{
    StackNode *stack = NULL;

    int x = 5;
    int y = 6;

    stack = push(stack, &x);
    stack = push(stack, &y);

    clearStack(&stack);

    TEST_ASSERT_NULL(stack);
}