etl/test/test_not_null_pointer.cpp

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2025 John Wellbelove

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******************************************************************************/

#include "unit_test_framework.h"
#include "etl/not_null.h"

namespace
{
  struct S
  {
    int x;

    int get() const
    {
      return x;
    }
  };

  SUITE(test_not_null_pointer)
  {
    //*************************************************************************
    TEST(test_construct_from_non_null_pointer)
    {
      int value = 123;
      etl::not_null<int*> nn(&value);
      CHECK_EQUAL(&value, nn.get());
      CHECK_EQUAL(123, *nn);
    }

    //*************************************************************************
    TEST(test_copy_construct)
    {
      int value = 123;
      etl::not_null<int*> nn1(&value);
      etl::not_null<int*> nn2(nn1); // Copy constructor
      CHECK_EQUAL(&value, nn2.get());
      CHECK_EQUAL(123, *nn2);
    }

    //*************************************************************************
    TEST(test_assign_from_pointer)
    {
      int value1 = 123;
      etl::not_null<int*> nn1(&value1);

      int value2 = 456;

      nn1 = &value2;
      CHECK_EQUAL(&value2, nn1.get());
      CHECK_EQUAL(456, *nn1);
    }

    //*************************************************************************
    TEST(test_assign_from_not_null)
    {
      int value1 = 123;
      etl::not_null<int*> nn1(&value1);

      int value2 = 456;
      etl::not_null<int*> nn2(&value2);

      nn1 = nn2;
      CHECK_EQUAL(&value2, nn2.get());
      CHECK_EQUAL(456, *nn2);
    }

    //*************************************************************************
    TEST(test_implicit_conversion)
    {
      S s{123};
      etl::not_null<S*> nn(&s);

      S* raw = nn;
      CHECK_EQUAL(&s, raw);
    }

    //*************************************************************************
    TEST(test_arrow_operator)
    {
      S s{123};
      etl::not_null<S*> nn(&s);

      CHECK_EQUAL(s.x, nn->x);
      CHECK_EQUAL(s.get(), nn->get());
    }

    //*************************************************************************
    TEST(test_dereference_operator)
    {
      S s{123};
      etl::not_null<S*> nn(&s);

      CHECK_EQUAL(s.x, (*nn).x);
      CHECK_EQUAL(s.get(), (*nn).get());
    }

    //*************************************************************************
    TEST(test_construct_from_null_pointer_asserts)
    {
      CHECK_THROW(etl::not_null<int*> nn(nullptr), etl::not_null_contains_null);
    }

    //*************************************************************************
    TEST(test_assign_null_pointer_asserts)
    {
      int value = 1;
      etl::not_null<int*> nn(&value);

      CHECK_THROW(nn = nullptr, etl::not_null_contains_null);
    }

    //*************************************************************************
    TEST(test_non_null_comparisons)
    {
      int value[2] = { 123, 456 };
      etl::not_null<int*> nn1(&value[0]);
      etl::not_null<int*> nn2(&value[1]);
      CHECK_TRUE(nn1 == nn1);
      CHECK_TRUE(nn1 != nn2);
      CHECK_TRUE(nn2 != nn1);

      CHECK_FALSE(nn1 < nn1);
      CHECK_TRUE(nn1 < nn2);
      CHECK_FALSE(nn2 < nn1);

      CHECK_TRUE(nn1 <= nn1);
      CHECK_TRUE(nn1 <= nn2);
      CHECK_FALSE(nn2 <= nn1);

      CHECK_FALSE(nn1 > nn1);
      CHECK_FALSE(nn1 > nn2);
      CHECK_TRUE(nn2 > nn1);

      CHECK_TRUE(nn1 >= nn1);
      CHECK_FALSE(nn1 >= nn2);
      CHECK_TRUE(nn2 >= nn1);
    }
  };
}