bc25793-TestCollatz.c++

/**
 * @file TestCollatz.c++
 * @brief Unit tests for Collatz using Google Test.
 * @copyright Copyright (C) 2016
 * @author Glenn P. Downing
 * @author Brian Cui
 */

// https://code.google.com/p/googletest/wiki/V1_7_Primer#Basic_Assertions

// --------
// includes
// --------

#include <iostream> // cout, endl
#include <sstream>  // istringtstream, ostringstream
#include <string>   // string
#include <utility>  // pair

#include "gtest/gtest.h"

#include "Collatz.h"

using namespace std;

// ----
// read
// ----

TEST(CollatzFixture, read_1) {
  istringstream r("1 10\n");
  int i;
  int j;
  const bool b = collatz_read(r, i, j);
  ASSERT_TRUE(b);
  ASSERT_EQ(1, i);
  ASSERT_EQ(10, j);
}

TEST(CollatzFixture, read_2) {
  istringstream r("999999 999998\n");
  int i;
  int j;
  const bool b = collatz_read(r, i, j);
  ASSERT_TRUE(b);
  ASSERT_EQ(999999, i);
  ASSERT_EQ(999998, j);
}

// ----
// eval
// ----

TEST(CollatzFixture, eval_1) {
  const int v = collatz_eval(1, 10);
  ASSERT_EQ(20, v);
}

TEST(CollatzFixture, eval_2) {
  const int v = collatz_eval(100, 200);
  ASSERT_EQ(125, v);
}

TEST(CollatzFixture, eval_3) {
  const int v = collatz_eval(201, 210);
  ASSERT_EQ(89, v);
}

TEST(CollatzFixture, eval_4) {
  const int v = collatz_eval(900, 1000);
  ASSERT_EQ(174, v);
}

TEST(CollatzFixture, eval_5) {
  const int v = collatz_eval(5000, 50);
  ASSERT_EQ(238, v);
}

TEST(CollatzFixture, eval_6) {
  const int v = collatz_eval(999999, 999998);
  ASSERT_EQ(259, v);
}

// -----
// print
// -----

TEST(CollatzFixture, print_1) {
  ostringstream w;
  collatz_print(w, 1, 10, 20);
  ASSERT_EQ("1 10 20\n", w.str());
}

TEST(CollatzFixture, print_2) {
  ostringstream w;
  collatz_print(w, 999999, 999998, 259);
  ASSERT_EQ("999999 999998 259\n", w.str());
}

// -----
// solve
// -----

TEST(CollatzFixture, solve_1) {
  istringstream r("1 10\n100 200\n201 210\n900 1000\n");
  ostringstream w;
  collatz_solve(r, w);
  ASSERT_EQ("1 10 20\n100 200 125\n201 210 89\n900 1000 174\n", w.str());
}

TEST(CollatzFixture, solve_2) {
  istringstream r("5000 50\n999999 999998\n");
  ostringstream w;
  collatz_solve(r, w);
  ASSERT_EQ("5000 50 238\n999999 999998 259\n", w.str());
}