def test_exception_safe(self):
print("""
Your best_move function is not careful with its exception handling. It is
masking illegitimate errors generated by the Game utility() function.
If you have code that looks like:
try:
some code
except:
more code
you need to specify the excpetion you are intending to handle:
try:
some code
except SpecificError:
more code
""")
class Nasty:
def utility(game, move):
raise IndexError("This should not be handled by the student.")
from LabC1 import best_move
game = Nasty()
moves = [1, 2, 3]
with self.assertRaises(IndexError):
best_move(game, moves)
def test_no_output(self):
# Based on code from user1200039 http://stackoverflow.com/questions/5136611/capture-stdout-from-a-script-in-python
import sys
from io import StringIO
from LabC1 import best_move
from GameUno import GameUno, RED
print("""
Most commonly your program fails this test if you use a print statement
in your best_move function. You must not print anything in this function.
Instead, you should return the location so that the test code can access it.
Wrong:
def add(a, b):
""\" Add a and b.""\"
print(a+b)
Right:
def add(a, b):
""\" Return the sum of a and b.""\"
return a+b
""")
oldout = sys.stdout
buf = StringIO()
game = GameUno()
moves = [game.card(3, RED)]
try:
sys.stdout = buf
best_move(game, moves)
finally:
sys.stdout = oldout
self.assertEqual(len(buf.getvalue()), 0)
def test_best_move_empty(self):
print("""
This happens when you do not correctly handle empty lists.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves = []
self.assertEqual(best_move(game, moves), None)
def test_best_move_single(self):
print("""
This happens when you do not correctly handle lists with only a single entry.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves = [game.card(10, BLUE)]
self.assertEqual(best_move(game, moves), moves[0])
def test_best_move_first(self):
print("""
This happens when you do not best_move the first entry in a list.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves=[game.card(WILD), game.card(4,BLUE), game.card(DRAW2,BLUE),\
game.card(10,BLUE), game.card(REVERSE,BLUE), game.card(0,BLUE)]
self.assertEqual(best_move(game, moves), moves[0])
def test_best_move_last(self):
print("""
This happens when you do not correctly best_move the last item in the list.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves=[game.card(2,BLUE), game.card(4,BLUE), game.card(7,BLUE),\
game.card(9,BLUE), game.card(3,BLUE), game.card(10,BLUE)]
self.assertEqual(best_move(game, moves), moves[-1])
def test_best_move_middle(self):
print("""
This happens when you do not correctly best_move an entry in the middle of the list.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves=[game.card(2,BLUE), game.card(4,BLUE), game.card(DRAW2,BLUE),\
game.card(10,BLUE), game.card(8,BLUE), game.card(0,BLUE)]
self.assertEqual(best_move(game, moves), moves[2])
def test_best_move_multiples(self):
print("""
This happens when you do not correctly return the first location of a value
that is in the list multiple times.
""")
from LabC1 import best_move
from GameUno import GameUno, RED, GREEN, BLUE, YELLOW, \
REVERSE, SKIP, DRAW2, WILD, WILD4
game = GameUno()
moves=[game.card(2,BLUE), game.card(4,BLUE), game.card(DRAW2,BLUE),\
game.card(10,BLUE), game.card(REVERSE,BLUE), game.card(0,BLUE)]
self.assertEqual(best_move(game, moves), moves[2])