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test_exercise3.py
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test_exercise3.py
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#!/usr/bin/env python
""" Assignment 2, Exercise 3, INF1340, Fall, 2015. DBMS
Test module for exercise3.py
"""
__author__ = 'Susan Sim'
__email__ = "ses@drsusansim.org"
__copyright__ = "2015 Susan Sim"
__license__ = "MIT License"
from exercise3 import union, intersection, difference
###########
# TABLES ##
###########
GRADUATES = [["Number", "Surname", "Age"],
[7274, "Robinson", 37],
[7432, "O'Malley", 39],
[9824, "Darkes", 38]]
MANAGERS = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38]]
EMPLOYEES = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38],
[0001, "Grey", 45],
[0002, "Locke", 40],
[0003, "Hughes", 59]]
OWNER = [["Number","Surname","Age"],
[0000,"Jeff", 55]]
PETS = [["Species", "Name"],
["Cat", "Lola"],
["Cat", "Junior"],
["Dog", "Tini"]]
#####################
# HELPER FUNCTIONS ##
#####################
def is_equal(t1, t2):
if t1 is None or t2 is None:
return t1 == t2
else:
return sorted(t1) == sorted(t2)
###################
# TEST FUNCTIONS ##
###################
def test_union():
"""
Test union operation.
"""
# Something of a table in common
result = [["Number", "Surname", "Age"],
[7274, "Robinson", 37],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38]]
assert is_equal(result, union(GRADUATES, MANAGERS))
assert is_equal(result, union(MANAGERS, GRADUATES))
# All of one table in common
result = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38],
[0001, "Grey", 45],
[0002, "Locke", 40],
[0003, "Hughes", 59]]
assert is_equal(result, union(MANAGERS, EMPLOYEES))
assert is_equal(result, union(EMPLOYEES, MANAGERS))
#Exactly the same table
assert is_equal(PETS, union(PETS, PETS))
# Nothing intersecting
result = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38],
[0000,"Jeff", 55]]
assert is_equal(result, union(MANAGERS, OWNER))
assert is_equal(result, union(OWNER, MANAGERS))
def test_union_mismatch_schema():
try:
union(PETS, EMPLOYEES)
assert False
except:
assert True
try:
union(MANAGERS, PETS)
assert False
except:
assert True
def test_intersection():
"""
Test intersection operation.
"""
# Something of a table in common
result = [["Number", "Surname", "Age"],
[7432, "O'Malley", 39],
[9824, "Darkes", 38]]
assert is_equal(result, intersection(GRADUATES, MANAGERS))
assert is_equal(result, intersection(MANAGERS, GRADUATES))
# All of one table in common
result = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56],
[7432, "O'Malley", 39],
[9824, "Darkes", 38]]
assert is_equal(result, intersection(EMPLOYEES, MANAGERS))
assert is_equal(result, intersection(MANAGERS, EMPLOYEES))
#Exactly the same table
assert is_equal(PETS, intersection(PETS, PETS))
# Nothing intersecting
assert is_equal(None, intersection(OWNER, MANAGERS))
assert is_equal(None, intersection(MANAGERS, OWNER))
def test_intersection_mismatch_schema():
try:
intersection(PETS, EMPLOYEES)
assert False
except:
assert True
try:
intersection(OWNER, PETS)
assert False
except:
assert True
def test_difference():
"""
Test difference operation.
"""
# Something of a table in common
result = [["Number", "Surname", "Age"],
[7274, "Robinson", 37]]
assert is_equal(result, difference(GRADUATES, MANAGERS))
result = [["Number", "Surname", "Age"],
[9297, "O'Malley", 56]]
assert is_equal(result, difference(MANAGERS, GRADUATES))
# All of one table in common
result = [["Number", "Surname", "Age"],
[0001, "Grey", 45],
[0002, "Locke", 40],
[0003, "Hughes", 59]]
assert is_equal(result, difference(EMPLOYEES, MANAGERS))
assert is_equal(None, difference(MANAGERS, EMPLOYEES))
#Exactly the same table
assert is_equal(None, difference(PETS, PETS))
# Nothing intersecting
assert is_equal(OWNER, difference(OWNER, MANAGERS))
assert is_equal(MANAGERS, difference(MANAGERS, OWNER))
def test_difference_mismatch_schema():
try:
difference(PETS, EMPLOYEES)
assert False
except:
assert True
try:
difference(GRADUATES, PETS)
assert False
except:
assert True