skw927-TestCollatz.c++

// --------------------------------
// projects/collatz/TestCollatz.c++
// Copyright (C) 2016
// Glenn P. Downing
// --------------------------------

// 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) {
  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);
}

// ---------------------
// cycle length (cached)
// ---------------------

TEST(CollatzFixture, cache_1) {
  const int v = cycle_length_cached(1);
  ASSERT_EQ(1, v);
}

TEST(CollatzFixture, cache_2) {
  const int v = cycle_length_cached(4);
  ASSERT_EQ(3, v);
}

TEST(CollatzFixture, cache_3) {
  const int v = cycle_length_cached(5);
  ASSERT_EQ(6, v);
}

// ------------
// cycle length
// ------------

TEST(CollatzFixture, len_1) {
  const int v = cycle_length(1);
  ASSERT_EQ(1, v);
}

TEST(CollatzFixture, len_2) {
  const int v = cycle_length(4);
  ASSERT_EQ(3, v);
}

TEST(CollatzFixture, len_3) {
  const int v = cycle_length(5);
  ASSERT_EQ(6, v);
}

// ----
// 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(1, 1);
  ASSERT_EQ(1, v);
}

TEST(CollatzFixture, eval_6) {
  const int v = collatz_eval(6, 10);
  ASSERT_EQ(20, v);
}

TEST(CollatzFixture, eval_7) {
  const int v = collatz_eval(6179, 6183);
  ASSERT_EQ(156, v);
}

TEST(CollatzFixture, eval_8) {
  const int v = collatz_eval(10, 1);
  ASSERT_EQ(20, v);
}

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

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

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

TEST(CollatzFixture, solve) {
  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());
}