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scw2243-TestCollatz.py
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scw2243-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
"""
Tester program for Collatz Conjecture
"""
# -------
# imports
# -------
from io import StringIO
from unittest import main, TestCase
from Collatz import collatz_read, collatz_eval, collatz_print, collatz_solve, cycle_length
# -----------
# TestCollatz
# -----------
class TestCollatz(TestCase):
"""
A class to test functions from Collatz program
"""
# ----
# read
# ----
def test_read_1(self):
"""
A function to test collatz_read.
"""
string = "1 10\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 1)
self.assertEqual(end, 10)
def test_read_2(self):
"""
A function to test collatz_read.
"""
string = "5 5\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 5)
self.assertEqual(end, 5)
def test_read_3(self):
"""
A function to test collatz_read.
"""
string = "125 120\n"
begin, end = collatz_read(string)
self.assertEqual(begin, 125)
self.assertEqual(end, 120)
# ------------
# cycle_length
# ------------
def test_cycle_length_1(self):
"""
A function to test cycle_length.
"""
length = cycle_length(27)
self.assertEqual(length, 112)
def test_cycle_length_2(self):
"""
A function to test cycle_length.
"""
length = cycle_length(22221)
self.assertEqual(length, 132)
def test_cycle_length_3(self):
"""
A function to test cycle_length.
"""
length = cycle_length(9823)
self.assertEqual(length, 123)
# ----
# eval
# ----
def test_eval_1(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(1, 10)
self.assertEqual(val, 20)
def test_eval_2(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(100, 200)
self.assertEqual(val, 125)
def test_eval_3(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(201, 210)
self.assertEqual(val, 89)
def test_eval_4(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(900, 1000)
self.assertEqual(val, 174)
def test_eval_5(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(100, 100)
self.assertEqual(val, 26)
def test_eval_6(self):
"""
A function to test collatz_eval.
"""
val = collatz_eval(206, 200)
self.assertEqual(val, 89)
# -----
# print
# -----
def test_print_1(self):
"""
A function to test collatz_print.
"""
writer = StringIO()
collatz_print(writer, 1, 10, 20)
self.assertEqual(writer.getvalue(), "1 10 20\n")
def test_print_2(self):
"""
A function to test collatz_print.
"""
writer = StringIO()
collatz_print(writer, 5, 5, 6)
self.assertEqual(writer.getvalue(), "5 5 6\n")
def test_print_3(self):
"""
A function to test collatz_print.
"""
writer = StringIO()
collatz_print(writer, 125, 10, 30)
self.assertEqual(writer.getvalue(), "125 10 30\n")
# -----
# solve
# -----
def test_solve_1(self):
"""
A function to test collatz_solve.
"""
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\n201 210 89\n900 1000 174\n")
def test_solve_2(self):
"""
A function to test collatz_solve.
"""
reader = StringIO("5 5\n125 120\n1 1\n55764 64444\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(writer.getvalue(), "5 5 6\n125 120 109\n1 1 1\n55764 64444 335\n")
def test_solve_3(self):
"""
A function to test collatz_solve.
"""
reader = StringIO("4 15\n399 406\n997 1010\n")
writer = StringIO()
collatz_solve(reader, writer)
self.assertEqual(writer.getvalue(), "4 15 20\n399 406 121\n997 1010 143\n")
# ----
# main
# ----
if __name__ == "__main__":
main()