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cw33374-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
""" Family of tests for Collatz.py """
# -------
# imports
# -------
from io import StringIO
from unittest import main, TestCase
from Collatz import collatz_read, collatz_eval, collatz_print, collatz_solve, cycle_length, CACHE
# -----------
# TestCollatz
# -----------
class TestCollatz(TestCase):
""" Tests all functions in Collatz.py """
# ----
# read
# ----
def test_read(self):
""" Tests collatz_read() """
src = "1 10\n"
i, j = collatz_read(src)
self.assertEqual(i, 1)
self.assertEqual(j, 10)
# ----
# eval
# ----
def test_eval_1(self):
""" Tests collatz_eval(1, 10)"""
mcl = collatz_eval(1, 10)
self.assertEqual(mcl, 20)
def test_eval_2(self):
""" Tests collatz_eval(100, 200)"""
mcl = collatz_eval(100, 200)
self.assertEqual(mcl, 125)
def test_eval_3(self):
""" Tests collatz_eval(201, 210)"""
mcl = collatz_eval(201, 210)
self.assertEqual(mcl, 89)
def test_eval_4(self):
""" Tests collatz_eval(900, 1000)"""
mcl = collatz_eval(900, 1000)
self.assertEqual(mcl, 174)
def test_eval_reverse(self):
""" Test collatz_eval(10, 1) """
mcl = collatz_eval(10, 1)
self.assertEqual(mcl, 20)
# ------------
# cycle_length
# ------------
def test_cycle_base(self):
""" Tests cycle_length(1) """
length = cycle_length(1)
self.assertEqual(length, 1)
def test_cycle_even(self):
""" Tests cycle_length(2) """
length = cycle_length(2)
self.assertEqual(length, 2)
def test_cycle_odd(self):
""" Tests cycle_length(5) """
length = cycle_length(5)
self.assertEqual(length, 6)
def test_cycle_invalid(self):
""" Tests cycle_length on invalid domain """
with self.assertRaises(AssertionError):
cycle_length(-1)
def test_cycle_large(self):
""" Tests cycle_length on large values """
length = cycle_length(999699)
self.assertEqual(length, 184)
def test_cycle_cache(self):
""" Test that the cache has the right things after a computation """
CACHE.clear()
cycle_length(5)
self.assertEqual(CACHE[5], 6)
self.assertEqual(CACHE[8], 4)
self.assertEqual(CACHE[4], 3)
self.assertEqual(CACHE[2], 2)
self.assertEqual(CACHE[1], 1)
# -----
# print
# -----
def test_print(self):
""" Tests collatz_print() """
out = StringIO()
collatz_print(out, 1, 10, 20)
self.assertEqual(out.getvalue(), "1 10 20\n")
# -----
# solve
# -----
def test_solve(self):
""" Tests collatz_solve() """
src = StringIO("1 10\n100 200\n201 210\n900 1000\n")
out = StringIO()
collatz_solve(src, out)
self.assertEqual(
out.getvalue(), "1 10 20\n100 200 125\n201 210 89\n900 1000 174\n")
def test_solve_empty(self):
""" Tests collatz_solve on an empty dataset """
src = StringIO("")
out = StringIO()
collatz_solve(src, out)
self.assertEqual(out.getvalue(), "")
def test_solve_blank_line(self):
""" Tests collatz_solve on input with blank lines """
src = StringIO("1 10\n100 200\n201 210\n\t \n900 1000\n")
out = StringIO()
collatz_solve(src, out)
self.assertEqual(
out.getvalue(), "1 10 20\n100 200 125\n201 210 89\n900 1000 174\n")
# ----
# main
# ----
if __name__ == "__main__":
main()