cac6253-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_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("10 1\n");
    int           i;
    int           j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b);
    ASSERT_EQ(10, i);
    ASSERT_EQ(1, j);}

TEST(CollatzFixture, read_3) {
    istringstream r("-1000 -100\n");
    int           i;
    int           j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b);
    ASSERT_EQ(-1000, i);
    ASSERT_EQ(-100, 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);}

// -------------
// compute_cycle
// -------------

TEST(CollatzFixture, compute_cycle_1) {
	int n = 1;
	int cycle_length = compute_cycle(n);
	ASSERT_EQ(cycle_length,1);}

TEST(CollatzFixture, compute_cycle_2) {
	int n = 5;
	int cycle_length = compute_cycle(n);
	ASSERT_EQ(cycle_length,6);}

TEST(CollatzFixture, compute_cycle_3) {
    int n = 100;
    int cycle_length = compute_cycle(n);
    ASSERT_EQ(cycle_length,26);}

TEST(CollatzFixture, max_1) {
	int a = 0;
	int b = 0;
	int max_num = max(a, b);
	ASSERT_EQ(max_num, 0);}

TEST(CollatzFixture, max_2) {
    int a = -5;
    int b = -2;
    int max_num = max(a, b);
    ASSERT_EQ(max_num, -2);}

TEST(CollatzFixture, max_3) {
    int a = 1000;
    int b = 999;
    int max_num = max(a, b);
    ASSERT_EQ(max_num, 1000);}




// -----
// 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, 100, 200, 175);
    ASSERT_EQ("100 200 175\n", w.str());}

TEST(CollatzFixture, print_3) {
    ostringstream w;
    collatz_print(w, 201, 210, 89);
    ASSERT_EQ("201 210 89\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("231 234\n345 456\n456 567\n657 678\n");
    ostringstream w;
    collatz_solve(r, w);
    ASSERT_EQ("231 234 128\n345 456 134\n456 567 142\n657 678 145\n", w.str());}

TEST(CollatzFixture, solve_3) {
    istringstream r("1 1\n2 2\n3 3\n4 4\n");
    ostringstream w;
    collatz_solve(r, w);
    ASSERT_EQ("1 1 1\n2 2 2\n3 3 8\n4 4 3\n", w.str());}