tpl_random_queue_test.cc

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  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
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  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
 
#include <gtest/gtest.h>
#include <tpl_random_queue.H>
#include <tpl_dynDlist.H>
#include <set>
#include <map>
#include <algorithm>
#include <thread>
#include <chrono>
 
using namespace Aleph;
 
// =============================================================================
// Basic Functionality Tests
// =============================================================================
 
class RandomSetTest : public ::testing::Test
{
protected:
  Random_Set<int> rset;
};
 
TEST_F(RandomSetTest, InitiallyEmpty)
{
  EXPECT_TRUE(rset.is_empty());
  EXPECT_EQ(rset.size(), 0);
}
 
TEST_F(RandomSetTest, PutAndSize)
{
  rset.put(1);
  EXPECT_EQ(rset.size(), 1);
  EXPECT_FALSE(rset.is_empty());
  
  rset.put(2);
  rset.put(3);
  EXPECT_EQ(rset.size(), 3);
}
 
TEST_F(RandomSetTest, GetReducesSize)
{
  rset.put(1);
  rset.put(2);
  rset.put(3);
  
  rset.get();
  EXPECT_EQ(rset.size(), 2);
  
  rset.get();
  rset.get();
  EXPECT_EQ(rset.size(), 0);
  EXPECT_TRUE(rset.is_empty());
}
 
TEST_F(RandomSetTest, GetReturnsInsertedElements)
{
  std::set<int> inserted = {1, 2, 3, 4, 5};
  for (int x : inserted)
    rset.put(x);
  
  std::set<int> retrieved;
  while (!rset.is_empty())
    retrieved.insert(rset.get());
  
  EXPECT_EQ(inserted, retrieved);
}
 
TEST_F(RandomSetTest, GetFromEmptyThrows)
{
  EXPECT_THROW(rset.get(), std::underflow_error);
}
 
TEST_F(RandomSetTest, PickDoesNotRemove)
{
  rset.put(1);
  rset.put(2);
  rset.put(3);
  
  rset.pick();  // Should not remove
  EXPECT_EQ(rset.size(), 3);
  
  rset.pick();
  EXPECT_EQ(rset.size(), 3);
}
 
TEST_F(RandomSetTest, PickFromEmptyThrows)
{
  EXPECT_THROW(rset.pick(), std::underflow_error);
}
 
// =============================================================================
// Append Tests (Random Insertion)
// =============================================================================
 
TEST_F(RandomSetTest, AppendInsertsElement)
{
  rset.append(1);
  EXPECT_EQ(rset.size(), 1);
  
  rset.append(2);
  rset.append(3);
  EXPECT_EQ(rset.size(), 3);
}
 
TEST_F(RandomSetTest, AppendReturnsReference)
{
  int& ref = rset.append(42);
  // The reference should be valid within the container
  EXPECT_GE(ref, 0);  // Just verify it's accessible
}
 
// =============================================================================
// Copy and Move Semantics
// =============================================================================
 
TEST_F(RandomSetTest, CopyConstructor)
{
  rset.put(1);
  rset.put(2);
  rset.put(3);
  
  Random_Set<int> copy(rset);
  
  EXPECT_EQ(copy.size(), 3);
  
  // Both should have same elements
  std::set<int> orig_elems, copy_elems;
  while (!rset.is_empty())
    orig_elems.insert(rset.get());
  while (!copy.is_empty())
    copy_elems.insert(copy.get());
  
  EXPECT_EQ(orig_elems, copy_elems);
}
 
TEST_F(RandomSetTest, MoveConstructor)
{
  rset.put(1);
  rset.put(2);
  rset.put(3);
  
  Random_Set<int> moved(std::move(rset));
  
  EXPECT_EQ(moved.size(), 3);
}
 
TEST_F(RandomSetTest, CopyAssignment)
{
  rset.put(1);
  rset.put(2);
  
  Random_Set<int> other;
  other.put(10);
  
  other = rset;
  
  EXPECT_EQ(other.size(), 2);
}
 
TEST_F(RandomSetTest, MoveAssignment)
{
  rset.put(1);
  rset.put(2);
  
  Random_Set<int> other;
  other = std::move(rset);
  
  EXPECT_EQ(other.size(), 2);
}
 
// =============================================================================
// Initializer List and Iterator Constructors
// =============================================================================
 
TEST(RandomSetConstructors, InitializerList)
{
  Random_Set<int> rset = {1, 2, 3, 4, 5};
  
  EXPECT_EQ(rset.size(), 5);
  
  std::set<int> retrieved;
  while (!rset.is_empty())
    retrieved.insert(rset.get());
  
  std::set<int> expected = {1, 2, 3, 4, 5};
  EXPECT_EQ(retrieved, expected);
}
 
TEST(RandomSetConstructors, FromDynList)
{
  DynList<int> list;
  list.append(1);
  list.append(2);
  list.append(3);
  
  Random_Set<int> rset(list);
  
  EXPECT_EQ(rset.size(), 3);
}
 
TEST(RandomSetConstructors, FromIteratorRange)
{
  std::vector<int> vec = {1, 2, 3, 4, 5};
  
  Random_Set<int> rset(vec.begin(), vec.end());
  
  EXPECT_EQ(rset.size(), 5);
}
 
// =============================================================================
// Randomness Tests
// =============================================================================
 
TEST(RandomSetRandomness, GetIsRandomWithDifferentSeeds)
{
  // Verify that different seeds produce different extraction order
  const int N = 100;
  
  // First extraction with seed 1
  Random_Set<int> rset1;
  for (int i = 0; i < N; ++i)
    rset1.put(i);
  rset1.set_seed(12345);
  std::vector<int> seq1;
  while (!rset1.is_empty())
    seq1.push_back(rset1.get());
  
  // Second extraction with seed 2
  Random_Set<int> rset2;
  for (int i = 0; i < N; ++i)
    rset2.put(i);
  rset2.set_seed(67890);
  std::vector<int> seq2;
  while (!rset2.is_empty())
    seq2.push_back(rset2.get());
  
  // Different seeds should produce different orders
  EXPECT_NE(seq1, seq2) << "Different seeds should produce different extraction orders";
}
 
TEST(RandomSetRandomness, SetSeedProducesReproducibleResults)
{
  Random_Set<int> rset1, rset2;
  
  for (int i = 0; i < 10; ++i)
    {
      rset1.put(i);
      rset2.put(i);
    }
  
  rset1.set_seed(12345);
  rset2.set_seed(12345);
  
  std::vector<int> seq1, seq2;
  while (!rset1.is_empty())
    seq1.push_back(rset1.get());
  while (!rset2.is_empty())
    seq2.push_back(rset2.get());
  
  EXPECT_EQ(seq1, seq2);
}
 
// =============================================================================
// Traverse Tests
// =============================================================================
 
TEST_F(RandomSetTest, TraverseAllElements)
{
  rset.put(1);
  rset.put(2);
  rset.put(3);
  
  std::set<int> visited;
  rset.traverse([&visited](int x) {
    visited.insert(x);
    return true;
  });
  
  std::set<int> expected = {1, 2, 3};
  EXPECT_EQ(visited, expected);
}
 
TEST_F(RandomSetTest, TraverseEarlyTermination)
{
  for (int i = 1; i <= 10; ++i)
    rset.put(i);
  
  int count = 0;
  rset.traverse([&count](int) {
    ++count;
    return count < 5;  // Stop after 5 elements
  });
  
  EXPECT_EQ(count, 5);
}
 
// =============================================================================
// Shuffle Function Tests
// =============================================================================
 
TEST(ShuffleFunction, ShufflesDynList)
{
  DynList<int> list;
  for (int i = 0; i < 10; ++i)
    list.append(i);
  
  auto shuffled = shuffle(list);
  
  // Same size
  EXPECT_EQ(shuffled.size(), list.size());
  
  // Same elements (just reordered)
  std::set<int> orig_set, shuffled_set;
  list.for_each([&](int x) { orig_set.insert(x); });
  shuffled.for_each([&](int x) { shuffled_set.insert(x); });
  
  EXPECT_EQ(orig_set, shuffled_set);
}
 
TEST(ShuffleFunction, ShuffleProducesPermutation)
{
  DynList<int> list;
  for (int i = 0; i < 100; ++i)
    list.append(i);
  
  auto shuffled = shuffle(list);
  
  // Check it's actually shuffled (not in original order)
  std::vector<int> orig_vec, shuffled_vec;
  list.for_each([&](int x) { orig_vec.push_back(x); });
  shuffled.for_each([&](int x) { shuffled_vec.push_back(x); });
  
  // With 100 elements, probability of same order is 1/100! ≈ 0
  EXPECT_NE(orig_vec, shuffled_vec);
}
 
// =============================================================================
// Move Semantics for Elements
// =============================================================================
 
TEST(RandomSetMoveSemantics, PutWithMove)
{
  Random_Set<std::string> rset;
  
  std::string s = "hello";
  rset.put(std::move(s));
  
  EXPECT_EQ(rset.size(), 1);
  // s may be empty after move
}
 
TEST(RandomSetMoveSemantics, AppendWithMove)
{
  Random_Set<std::string> rset;
  
  std::string s = "world";
  rset.append(std::move(s));
  
  EXPECT_EQ(rset.size(), 1);
}
 
// =============================================================================
// Stress Tests
// =============================================================================
 
TEST(RandomSetStress, ManyElements)
{
  Random_Set<int> rset;
  
  const int N = 10000;
  for (int i = 0; i < N; ++i)
    rset.put(i);
  
  EXPECT_EQ(rset.size(), N);
  
  std::set<int> retrieved;
  while (!rset.is_empty())
    retrieved.insert(rset.get());
  
  EXPECT_EQ(retrieved.size(), N);
  for (int i = 0; i < N; ++i)
    EXPECT_TRUE(retrieved.count(i));
}
 
TEST(RandomSetStress, ManyPutGetCycles)
{
  Random_Set<int> rset;
  
  for (int cycle = 0; cycle < 100; ++cycle)
    {
      // Add some elements
      for (int i = 0; i < 100; ++i)
        rset.put(cycle * 100 + i);
      
      // Remove some
      for (int i = 0; i < 50; ++i)
        rset.get();
    }
  
  // Should have 50 * 100 = 5000 elements remaining
  EXPECT_EQ(rset.size(), 5000);
}
 
// =============================================================================
// Edge Cases
// =============================================================================
 
TEST_F(RandomSetTest, SingleElement)
{
  rset.put(42);
  
  EXPECT_EQ(rset.get(), 42);
  EXPECT_TRUE(rset.is_empty());
}
 
TEST_F(RandomSetTest, DuplicateElements)
{
  rset.put(1);
  rset.put(1);
  rset.put(1);
  
  EXPECT_EQ(rset.size(), 3);
  
  int sum = 0;
  while (!rset.is_empty())
    sum += rset.get();
  
  EXPECT_EQ(sum, 3);  // Three 1's
}
 
// =============================================================================
// Main
// =============================================================================
 
int main(int argc, char **argv)
{
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}