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sag3289-TestCollatz.py
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sag3289-TestCollatz.py
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#!/usr/bin/env python3
# -------------------------------
# projects/collatz/TestCollatz.py
# Copyright (C) 2016
# Glenn P. Downing
# -------------------------------
# https://docs.python.org/3.4/reference/simple_stmts.html#grammar-token-assert_stmt
# pylint: disable=missing-docstring,too-many-public-methods
"""
Runs tests on Collatz.py
"""
from io import StringIO
from unittest import main, TestCase
from Collatz import collatz_read, collatz_eval, collatz_print, cycle_length, collatz_solve
# -----------
# TestCollatz
# -----------
class TestCollatz(TestCase):
# ----
# read
# ----
def test_read(self):
string = "1 10\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 1)
self.assertEqual(end, 10)
def test_read_2(self):
string = "999999 999999\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 999999)
self.assertEqual(end, 999999)
def test_read_3(self):
string = "9999 10\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 9999)
self.assertEqual(end, 10)
# ----
# eval
# ----
def test_eval_1(self):
c_length = collatz_eval(1, 10)
self.assertEqual(c_length, 20)
def test_eval_2(self):
c_length = collatz_eval(100, 200)
self.assertEqual(c_length, 125)
def test_eval_3(self):
c_length = collatz_eval(201, 210)
self.assertEqual(c_length, 89)
def test_eval_4(self):
c_length = collatz_eval(900, 1000)
self.assertEqual(c_length, 174)
def test_eval_5(self):
c_length = collatz_eval(1, 999999)
self.assertEqual(c_length, 525)
def test_eval_6(self):
c_length = collatz_eval(1, 1)
self.assertEqual(c_length, 1)
def test_eval_7(self):
c_length = collatz_eval(1, 837799)
self.assertEqual(c_length, 525)
# -------------
# cycle_length
# -------------
def test_cycle_1(self):
c_length = cycle_length(1)
self.assertEqual(c_length, 1)
def test_cycle_2(self):
c_length = cycle_length(999999)
self.assertEqual(c_length, 259)
def test_cycle_3(self):
c_length = cycle_length(837799)
self.assertEqual(c_length, 525)
# -----
# print
# -----
def test_print(self):
writer = StringIO()
collatz_print(writer, 1, 10, 20)
self.assertEqual(writer.getvalue(), "1 10 20\n")
def test_print_big(self):
writer = StringIO()
collatz_print(writer, 999999, 999999, 999999)
self.assertEqual(writer.getvalue(), "999999 999999 999999\n")
def test_print_zero(self):
writer = StringIO()
collatz_print(writer, 0, 0, 0)
self.assertEqual(writer.getvalue(), "0 0 0\n")
# -----
# solve
# -----
def test_solve(self):
reader = StringIO("1 10\n100 200\n201 210\n900 1000\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(
writer.getvalue(), "1 10 20\n100 200 125\n"
+ "201 210 89\n900 1000 174\n")
def test_solve_same(self):
reader = StringIO(
"1 1\n100 100\n2000 2000\n90000 90000\n999999 999999\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(
writer.getvalue(), "1 1 1\n100 100 26\n"
+ "2000 2000 113\n90000 90000 165\n999999 999999 259\n")
def test_solve_backwards(self):
reader = StringIO("10 1\n200 100\n210 201\n1000 900\n999999 1\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(
writer.getvalue(), "10 1 20\n200 100 125\n"
+ "210 201 89\n1000 900 174\n999999 1 525\n")
def test_solve_empty(self):
reader = StringIO("10 1\n\n10 1\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(
writer.getvalue(), "10 1 20\n10 1 20\n")
# ----
# main
# ----
if __name__ == "__main__":
main()