SkipList/main.cpp at main · vincentnw/SkipList · GitHub

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#include "skiplist.h"
#include <cassert>
#include <iostream>
#include <sstream>

using namespace std;

// ************************************
// IMPORTANT: The below tests use Random::random to get random numbers, so
// adding more tests (or removing tests) will change how the SkipList is
// structured! Calling Random::random unnecessarily may also break tests.
// On the plus side, each run uses the same random numbers which makes
// debugginng easier.
// ************************************

// testing basic operations: operator<<, add, contains
void test1() {
  stringstream outSS;
  SkipList skp;
  skp.add(3);
  outSS << skp;

  assert(outSS.str() == "[level: 1] 3-->nullptr\n");

  skp.add(9);
  outSS.str("");
  outSS << skp;

  assert(outSS.str() == "[level: 1] 3-->9-->nullptr\n");

  skp.add(1);
  outSS.str("");
  outSS << skp;

  assert(outSS.str() == "[level: 1] 1-->3-->9-->nullptr\n");

  skp.add(vector<int>{7, 5});
  outSS.str("");
  outSS << skp;

  assert(outSS.str() == "[level: 1] 1-->3-->5-->7-->9-->nullptr\n");

  assert(skp.contains(1) && skp.contains(7) && skp.contains(9));
  assert(!skp.contains(0) && !skp.contains(20));

  // TODO(student) check there are no memory leaks after test completed
  cout << "test1 done." << endl;
}

// testing the copy constructor for the SkipList
void test2() {
  stringstream outSS;
  SkipList *skp1 = new SkipList;
  skp1->add(vector<int>{9, 1, 7, 5});

  outSS.str("");
  outSS << *skp1;
  assert(outSS.str() == "[level: 1] 1-->5-->7-->9-->nullptr\n");

  SkipList *skp2 = new SkipList(*skp1);
  delete skp1;
  outSS.str("");
  outSS << *skp2;
  assert(outSS.str() == "[level: 1] 1-->5-->7-->9-->nullptr\n");
  delete skp2;
  // TODO(student) check there are no memory leaks after test completed
  cout << "test2 done." << endl;
}

// testing SkipList with multiple levels
void test3() {
  stringstream outSS;
  SkipList skp(3, 80);
  skp.add(vector<int>{9, 1, 7, 5, 3, 20});

  outSS << skp;
  assert(outSS.str() == "[level: 3] 7-->nullptr\n"
                        "[level: 2] 3-->7-->nullptr\n"
                        "[level: 1] 1-->3-->5-->7-->9-->20-->nullptr\n");

  skp.add(vector<int>{-20, 100});
  outSS.str("");
  outSS << skp;
  assert(outSS.str() ==
         "[level: 3] -20-->7-->100-->nullptr\n"
         "[level: 2] -20-->3-->7-->100-->nullptr\n"
         "[level: 1] -20-->1-->3-->5-->7-->9-->20-->100-->nullptr\n");

  // TODO(student) check that contains searches from top level down
  assert(skp.contains(1) && skp.contains(7) && skp.contains(9));
  assert(!skp.contains(0) && !skp.contains(200));
  assert(skp.contains(-20) && skp.contains(100));

  SkipList skp2(3, 30);
  skp2.add(vector<int>{9, 1, 7, 5, 3, 20});
  outSS.str("");
  outSS << skp2;
  assert(outSS.str() == "[level: 3] nullptr\n"
                        "[level: 2] 3-->5-->nullptr\n"
                        "[level: 1] 1-->3-->5-->7-->9-->20-->nullptr\n");

  assert(skp2.contains(3) && skp2.contains(5) && skp2.contains(20));
  assert(!skp2.contains(-3) && !skp2.contains(4) && !skp2.contains(200));
  // TODO(student) check there are no memory leaks after test completed
  cout << "test3 done." << endl;
}

// removing from multi-level SkipList
void test4() {
  stringstream outSS;
  SkipList skp(3, 50);
  skp.add(vector<int>{9, 1, 7, 5, 3, 20});

  outSS << skp;
  assert(outSS.str() == "[level: 3] 20-->nullptr\n"
                        "[level: 2] 3-->5-->7-->9-->20-->nullptr\n"
                        "[level: 1] 1-->3-->5-->7-->9-->20-->nullptr\n");
  SkipList skp2(skp);
  assert(skp.remove(1));
  assert(!skp.remove(100));
  assert(skp.remove(9));

  outSS.str("");
  outSS << skp;
  assert(outSS.str() == "[level: 3] 20-->nullptr\n"
                        "[level: 2] 3-->5-->7-->20-->nullptr\n"
                        "[level: 1] 3-->5-->7-->20-->nullptr\n");

  // skp2 should be unchanged
  outSS.str("");
  outSS << skp2;
  assert(outSS.str() == "[level: 3] 20-->nullptr\n"
                        "[level: 2] 3-->5-->7-->9-->20-->nullptr\n"
                        "[level: 1] 1-->3-->5-->7-->9-->20-->nullptr\n");
  // TODO(student) check there are no memory leaks after test completed
  cout << "test4 done." << endl;
}

int main() {
  test1();
  test2();
  test3();
  test4();
  cout << "Done." << endl;
  return 0;
}