etl/test/test_not_null_unique_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_unique_pointer)
  {
    //*************************************************************************
    TEST(test_construct_from_non_null_unique_ptr)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up(new int{ 123 });
      etl::not_null<up_t> nn(etl::move(up));

      CHECK_EQUAL(123, *nn);
      CHECK_EQUAL(123, *nn.get());
    }

    //*************************************************************************
    TEST(test_unique)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up1(new int{ 123 });
      etl::not_null<up_t> nn(etl::move(up1));

      up_t up2 = etl::move(nn.unique());

      CHECK_EQUAL(123, *up2.get());
    }

    //*************************************************************************
    TEST(test_unique_const)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up1(new int{ 123 });
      const etl::not_null<up_t> nn(etl::move(up1));

      const up_t& up2 = nn.unique();

      CHECK_EQUAL(123, *up2.get());
    }

    //*************************************************************************
    TEST(test_move_construct)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up(new int{ 123 });

      etl::not_null<up_t> nn1(etl::move(up));
      etl::not_null<up_t> nn2(etl::move(nn1)); // Move constructor

      CHECK_TRUE(nn1.get() == nullptr);
      CHECK_EQUAL(123, *nn2.get());
      CHECK_EQUAL(123, *nn2);
    }

    //*************************************************************************
    TEST(test_assign_from_unique_ptr)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up1(new int{ 123 });
      etl::not_null<up_t> nn1(etl::move(up1));

      using up_t = etl::unique_ptr<int>;
      up_t up2(new int);
      *up2 = 456;

      nn1 = etl::move(up2);

      CHECK_EQUAL(456, *nn1.get());
    }

    //*************************************************************************
    TEST(test_assign_from_not_null)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up1(new int{ 123 });
      etl::not_null<up_t> nn1(etl::move(up1));

      up_t up2(new int{ 456 });
      etl::not_null<up_t> nn2(etl::move(up2));

      nn1 = etl::move(nn2);

      CHECK_TRUE(nn2.get() == nullptr);
      CHECK_EQUAL(456, *nn1.get());
    }

    //*************************************************************************
    TEST(test_implicit_conversion)
    {
      using up_t = etl::unique_ptr<S>;
      up_t up1(new S{ 123 });
      etl::not_null<up_t> nn1(etl::move(up1));

      S s = *nn1;

      CHECK_EQUAL(123, s.x);
    }

    //*************************************************************************
    TEST(test_arrow_operator)
    {
      S s{ 123 };

      using up_t = etl::unique_ptr<S>;
      up_t up1(new S{ 123 });
      etl::not_null<up_t> nn1(etl::move(up1));

      CHECK_EQUAL(s.x, nn1->x);
      CHECK_EQUAL(s.get(), nn1->get());
    }

    //*************************************************************************
    TEST(test_dereference_operator)
    {
      S s{ 123 };

      using up_t = etl::unique_ptr<S>;
      up_t up1(new S{ 123 });
      etl::not_null<up_t> nn1(etl::move(up1));

      CHECK_EQUAL(s.x, (*nn1).x);
      CHECK_EQUAL(s.get(), (*nn1).get());
    }

    //*************************************************************************
    TEST(test_construct_from_null_pointer_asserts)
    {
      using up_t = etl::unique_ptr<int>;
      up_t up1(nullptr);

      CHECK_THROW(etl::not_null<up_t> nn1(etl::move(up1)), etl::not_null_contains_null);
    }
  }
}