ftc244-TestCollatz.c++

// --------------------------------
// projects/collatz/TestCollatz.c++
// Copyright (C) 2013
// Glenn P. Downing
// --------------------------------

/*
To test the program:
    % ls -al /usr/include/gtest/
    ...
    gtest.h
    ...

    % locate libgtest.a
    /usr/lib/libgtest.a

    % locate libpthread.a
    /usr/lib/x86_64-linux-gnu/libpthread.a
    /usr/lib32/libpthread.a

    % locate libgtest_main.a
    /usr/lib/libgtest_main.a

    % g++ -pedantic -std=c++0x -Wall Collatz.c++ TestCollatz.c++ -o TestCollatz -lgtest -lpthread -lgtest_main

    % valgrind TestCollatz > TestCollatz.out
*/

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

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

#include "gtest/gtest.h"

#include "Collatz.h"

// -----------
// TestCollatz
// -----------

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

TEST(Collatz, read) {
    std::istringstream r("1 10\n");
    int i;
    int j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b == true);
    ASSERT_TRUE(i ==    1);
    ASSERT_TRUE(j ==   10);}

TEST(Collatz, read_2) {
    std::istringstream r("10 1000\n");
    int i, j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b == true);
    ASSERT_TRUE(i ==    10);
    ASSERT_TRUE(j ==   1000);}

TEST(Collatz, read_large) {
    std::istringstream r("999999 999999\n");
    int i, j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b == true);
    ASSERT_TRUE(i ==    999999);
    ASSERT_TRUE(j ==   999999);}

TEST(Collatz, read_more) {
    std::istringstream r("7654 3210\n");
    int i, j;
    const bool b = collatz_read(r, i, j);
    ASSERT_TRUE(b == true);
    ASSERT_TRUE(i ==    7654);
    ASSERT_TRUE(j ==   3210);}


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

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

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

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

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

TEST(Collatz, eval_base) {
    const int v = collatz_eval(1, 1);
    ASSERT_TRUE(v == 1);}

TEST(Collatz, eval_backwards) {
    const int v = collatz_eval(10, 1);
    ASSERT_TRUE(v == 20);}

TEST(Collatz, eval_large) {
    const int v = collatz_eval(1000, 2000);
    ASSERT_TRUE(v == 182);}


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

TEST(Collatz, print) {
    std::ostringstream w;
    collatz_print(w, 1, 10, 20);
    ASSERT_TRUE(w.str() == "1 10 20\n");}

TEST(Collatz, print_9s) {
    std::ostringstream w;
    collatz_print(w, 9999, 9999, 9999);
    ASSERT_TRUE(w.str() == "9999 9999 9999\n");}

TEST(Collatz, print_3) {
    std::ostringstream w;
    collatz_print(w, 1000, 1020, 1987);
    ASSERT_TRUE(w.str() == "1000 1020 1987\n");}

TEST(Collatz, print_zeros) {
    std::ostringstream w;
    collatz_print(w, 0, 0, 0);
    ASSERT_TRUE(w.str() == "0 0 0\n");}

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

TEST(Collatz, solve) {
    std::istringstream r("1 10\n100 200\n201 210\n900 1000\n");
    std::ostringstream w;
    collatz_solve(r, w);
    ASSERT_TRUE(w.str() == "1 10 20\n100 200 125\n201 210 89\n900 1000 174\n");}

TEST(Collatz, solve_baseCases) {
    std::istringstream r("1 2\n1 1\n1 10\n10 1\n");
    std::ostringstream w;
    collatz_solve(r, w);
    ASSERT_TRUE(w.str() == "1 2 2\n1 1 1\n1 10 20\n10 1 20\n");}

TEST(Collatz, solve_empty) {
    std::istringstream r("");
    std::ostringstream w;
    collatz_solve(r, w);
    ASSERT_TRUE(w.str() == "");}

TEST(Collatz, solve_large) {
    std::istringstream r("900 1000");
    std::ostringstream w;
    collatz_solve(r, w);
    ASSERT_TRUE(w.str() == "900 1000 174\n");}