etl/test/test_result.cpp

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

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

Copyright(c) 2017 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/

#include "unit_test_framework.h"

#include "etl/result.h"
#include "etl/type_traits.h"

#include <string>

namespace
{
  struct Value
  {
    std::string v;
  };

  struct ValueM
  {
    ValueM()
    {
    }

    ValueM(const std::string& v_) 
      : v(v_)
    {
    }

    ValueM(ValueM&&) = default;
    ValueM& operator =(ValueM&&) = default;

    ValueM(const ValueM&) = delete;
    ValueM& operator =(const ValueM&) = delete;

    std::string v;
  };

  struct Error
  {
    std::string e;
  };

  struct ErrorM
  {
    ErrorM()
    {
    }

    ErrorM(const std::string& e_)
      : e(e_)
    {
    }

    ErrorM(ErrorM&& other) = default;
    ErrorM& operator =(ErrorM&& rhs) = default;

    ErrorM(const ErrorM& other) = delete;
    ErrorM& operator =(const ErrorM& rhs) = delete;

    std::string e;
  };

  using Result  = etl::result<Value, Error>;
  using ResultV = etl::result<void, Error>;
  using ResultM = etl::result<ValueM, ErrorM>;
}

// Definitions for when the STL and compiler built-ins are not available.
#if ETL_NOT_USING_STL && !defined(ETL_USE_TYPE_TRAITS_BUILTINS)

using etl::is_copy_constructible;
using etl::is_move_constructible;

//*************************
template <>
struct etl::is_copy_constructible<Value> : public etl::true_type
{
};

template <>
struct etl::is_move_constructible<Value> : public etl::true_type
{
};

template <>
struct etl::is_copy_constructible<Error> : public etl::true_type
{
};

template <>
struct etl::is_move_constructible<Error> : public etl::true_type
{
};

//*************************
template <>
struct etl::is_copy_constructible<ValueM> : public etl::false_type
{
};

template <>
struct etl::is_move_constructible<ValueM> : public etl::false_type
{
};

template <>
struct etl::is_copy_constructible<ErrorM> : public etl::false_type
{
};

template <>
struct etl::is_move_constructible<ErrorM> : public etl::false_type
{
};
#endif

namespace
{
  SUITE(test_result)
  {
    //*************************************************************************
    TEST(test_constructor_for_result_with_value)
    {
      Value input = { "value 1" };
      Result result(input);

      Value output = result.value();

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(output.v == input.v);
    }

    //*************************************************************************
    TEST(test_constructor_for_const_result_with_value)
    {
      Value input = { "value 1" };
      const Result result(input);

      const Value& output = result.value();

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(output.v == input.v);
    }

    //*************************************************************************
    TEST(test_constructor_for_moveable_result_with_value)
    {
      ValueM input = { "value 1" };
      ResultM result(etl::move(input));

      ValueM output = etl::move(result.value());

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(output.v == std::string("value 1"));
    }

    //*************************************************************************
    TEST(test_constructor_for_result_with_error)
    {
      Error input = { "error 1" };
      Result result(input);

      Error output = result.error();

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == input.e);
    }

    //*************************************************************************
    TEST(test_constructor_for_const_result_with_error)
    {
      Error input = { "error 1" };
      const Result result(input);

      const Error& output = result.error();

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == input.e);
    }

    //*************************************************************************
    TEST(test_constructor_for_moveable_result_with_error)
    {
      ErrorM input = { "error 1" };
      ResultM result(etl::move(input));

      ErrorM output = etl::move(result.error());

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == std::string("error 1"));
    }

    //*************************************************************************
    TEST(test_constructor_for_result_void_value_with_error)
    {
      Error input = { "error 1" };
      ResultV result(input);

      Error output = result.error();

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == input.e);
    }

    //*************************************************************************
    TEST(test_constructor_for_const_result_void_value_with_error)
    {
      Error input = { "error 1" };
      const ResultV result(input);

      const Error& output = result.error();

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == input.e);
    }

    //*************************************************************************
    TEST(test_constructor_for_moveable_result_void_value_with_error)
    {
      Error input = { "error 1" };
      ResultV result(etl::move(input));

      Error output = etl::move(result.error());

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == std::string("error 1"));
    }

    //*************************************************************************
    TEST(test_constructor_for_moveable_const_result_void_value_with_error)
    {
      Error input = { "error 1" };
      const ResultV result(etl::move(input));

      Error output = etl::move(result.error());

      CHECK(!result.is_value());
      CHECK(result.is_error());
      CHECK(output.e == std::string("error 1"));
    }

    //*************************************************************************
    TEST(test_copy_construct_result)
    {
      Value input = { "value 1" };
      Result result(input);

      Result result2(result);

      Value output = result2.value();

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(result2.is_value());
      CHECK(!result2.is_error());
      CHECK(output.v == input.v);
    }

    //*************************************************************************
    TEST(test_move_construct_result)
    {
      Value input = { "value 1" };
      Result result(input);

      Result result2(etl::move(result));

      Value output = result.value();
      Value output2 = result2.value();

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(result2.is_value());
      CHECK(!result2.is_error());
      CHECK(output.v != input.v);
      CHECK(output2.v == input.v);
    }

    //*************************************************************************
    TEST(test_move_assign_result)
    {
      Value input = { "value 1" };
      Result result(input);

      Value input2 = { "value 2" };
      Result result2(result);

      result2 = etl::move(result);

      Value output  = result.value();
      Value output2 = result2.value();

      CHECK(result.is_value());
      CHECK(!result.is_error());
      CHECK(result2.is_value());
      CHECK(!result2.is_error());
      CHECK(output.v != input.v);
      CHECK(output2.v == input.v);
    }
  };
}