etl/test/test_successor.cpp

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

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

Copyright(c) 2022 jwellbelove

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

#include "unit_test_framework.h"

#include "etl/successor.h"

namespace
{
  //*******************************************************
  struct SuccessorBase : etl::successor<SuccessorBase>
  {
    SuccessorBase()
    {
    }

    SuccessorBase(SuccessorBase& successors...)
      : successor(successors)
    {
    }

    virtual void Test(int) = 0;
  };

  //*******************************************************
  struct SuccessorSameBase1 : SuccessorBase
  {
    SuccessorSameBase1()
      : value(0)
    {
    }

    SuccessorSameBase1(SuccessorBase& successors...)
      : SuccessorBase(successors)
      , value(0)
    {
    }

    void Test(int i) override
    {
      if (i > 1)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  //*******************************************************
  struct SuccessorSameBase2 : SuccessorBase
  {
    SuccessorSameBase2()
      : value(0)
    {
    }

    void Test(int i) override
    {
      if (i > 2)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  //*******************************************************
  struct SuccessorSameBase3 : SuccessorBase
  {
    SuccessorSameBase3()
      : value(0)
    {
    }

    void Test(int i) override
    {
      if (i > 3)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  //*******************************************************
  struct SuccessorSameBase4 : SuccessorBase
  {
    SuccessorSameBase4()
      : value(0)
    {
    }

    void Test(int i) override
    {
      if (i > 4)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  //*******************************************************
  struct SuccessorSameBase5 : SuccessorBase
  {
    SuccessorSameBase5()
      : value(0)
    {
    }

    void Test(int i) override
    {
      value = i;
    }

    int value;
  };

  //*******************************************************
  struct SuccessorNoBase3
  {
    SuccessorNoBase3()
      : value(0)
    {
    }

    void Test(int i)
    {
      value = i;
    }

    int value;
  };

  //*******************************************************
  struct SuccessorNoBase2 : etl::successor<SuccessorNoBase3>
  {
    SuccessorNoBase2()
      : value(0)
    {
    }

    void Test(int i)
    {
      if (i > 2)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  //*******************************************************
  struct SuccessorNoBase1 : etl::successor<SuccessorNoBase2>
  {
    SuccessorNoBase1()
      : value(0)
    {
    }

    void Test(int i)
    {
      if (i > 1)
      {
        get_successor().Test(i);
      }
      else
      {
        value = i;
      }
    }

    int value;
  };

  SUITE(test_successor)
  {
    //*************************************************************************
    TEST(test_successors_same_check_append_multiple_to_first)
    {
      SuccessorSameBase1 successor1;
      SuccessorSameBase2 successor2;
      SuccessorSameBase3 successor3;
      SuccessorSameBase4 successor4;
      SuccessorSameBase5 successor5;

      successor1.append_successor(successor2, successor3, successor4, successor5);

      CHECK(successor1.has_successor());
      CHECK(successor2.has_successor());
      CHECK(successor3.has_successor());
      CHECK(successor4.has_successor());
      CHECK(!successor5.has_successor());

      CHECK(&successor1.get_successor() == &successor2);
      CHECK(&successor2.get_successor() == &successor3);
      CHECK(&successor3.get_successor() == &successor4);

      CHECK_THROW(successor5.get_successor(), etl::successor_invalid);
    }

    //*************************************************************************
    TEST(test_successors_same_check_append_multiple)
    {
      SuccessorSameBase1 successor1;
      SuccessorSameBase2 successor2;
      SuccessorSameBase3 successor3;
      SuccessorSameBase4 successor4;
      SuccessorSameBase5 successor5;

      successor1.set_successor(successor2, successor3);
      successor1.append_successor(successor4, successor5);

      CHECK(successor1.has_successor());
      CHECK(successor2.has_successor());
      CHECK(successor3.has_successor());
      CHECK(successor4.has_successor());
      CHECK(!successor5.has_successor());

      CHECK(&successor1.get_successor() == &successor2);
      CHECK(&successor2.get_successor() == &successor3);
      CHECK(&successor3.get_successor() == &successor4);

      CHECK_THROW(successor5.get_successor(), etl::successor_invalid);
    }

    //*************************************************************************
    TEST(test_successors_same_check_append_chain)
    {
      SuccessorSameBase1 successor1;
      SuccessorSameBase2 successor2;
      SuccessorSameBase3 successor3;
      SuccessorSameBase4 successor4;
      SuccessorSameBase5 successor5;

      successor1.set_successor(successor2, successor3);
      successor4.set_successor(successor5);
      successor1.append_successor(successor4);

      CHECK(successor1.has_successor());
      CHECK(successor2.has_successor());
      CHECK(successor3.has_successor());
      CHECK(successor4.has_successor());
      CHECK(!successor5.has_successor());

      CHECK(&successor1.get_successor() == &successor2);
      CHECK(&successor2.get_successor() == &successor3);
      CHECK(&successor3.get_successor() == &successor4);

      CHECK_THROW(successor5.get_successor(), etl::successor_invalid);
    }

    //*************************************************************************
    TEST(test_successors_same_check)
    {
      SuccessorSameBase1 successor1;
      SuccessorSameBase2 successor2;
      SuccessorSameBase3 successor3;

      successor1.set_successor(successor2, successor3);

      CHECK(successor1.has_successor());
      CHECK(successor2.has_successor());
      CHECK(!successor3.has_successor());

      CHECK(&successor1.get_successor() == &successor2);
      CHECK(&successor2.get_successor() == &successor3);

      CHECK_THROW(successor3.get_successor(), etl::successor_invalid);
    }

    //*************************************************************************
    TEST(test_successors_same_check_calls)
    {
      SuccessorSameBase1 successor1;
      SuccessorSameBase2 successor2;
      SuccessorSameBase3 successor3;

      successor1.set_successor(successor2, successor3);

      successor1.Test(1);
      successor1.Test(2);
      successor1.Test(3);

      CHECK_EQUAL(1, successor1.value);
      CHECK_EQUAL(2, successor2.value);
      CHECK_EQUAL(3, successor3.value);
    }

    //*************************************************************************
    TEST(test_successors_different_setup)
    {
      SuccessorNoBase1 successor1;
      SuccessorNoBase2 successor2;
      SuccessorNoBase3 successor3;

      successor1.set_successor(successor2, successor3);

      CHECK(successor1.has_successor());
      CHECK(successor2.has_successor());
      // successor3 does not support a successor.

      CHECK(&successor1.get_successor() == &successor2);
      CHECK(&successor2.get_successor() == &successor3);
    }

    //*************************************************************************
    TEST(test_successors_different_check_calls)
    {
      SuccessorNoBase1 successor1;
      SuccessorNoBase2 successor2;
      SuccessorNoBase3 successor3;

      successor1.set_successor(successor2, successor3);

      successor1.Test(1);
      successor1.Test(2);
      successor1.Test(3);

      CHECK_EQUAL(1, successor1.value);
      CHECK_EQUAL(2, successor2.value);
      CHECK_EQUAL(3, successor3.value);
    }
  }
}