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test.py
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# Copyright 2009-2017 Ram Rachum.
# This program is distributed under the MIT license.
'''Test module for `binary_search`.'''
from python_toolbox import binary_search
from python_toolbox import nifty_collections
from python_toolbox import misc_tools
def test():
'''Test the basic workings of `binary_search`.'''
my_list = [0, 1, 2, 3, 4]
assert binary_search.binary_search(
my_list,
3,
misc_tools.identity_function,
binary_search.EXACT
) == 3
assert binary_search.binary_search(
my_list,
3.2,
misc_tools.identity_function,
binary_search.CLOSEST
) == 3
assert binary_search.binary_search(
my_list,
3.2,
misc_tools.identity_function,
binary_search.LOW
) == 3
assert binary_search.binary_search(
my_list,
3.2,
misc_tools.identity_function,
binary_search.HIGH
) == 4
assert binary_search.binary_search(
my_list,
3.2,
misc_tools.identity_function,
binary_search.BOTH
) == (3, 4)
assert binary_search.binary_search(
my_list,
-5,
misc_tools.identity_function,
binary_search.BOTH
) == (None, 0)
assert binary_search.binary_search(
my_list,
-5,
misc_tools.identity_function,
binary_search.LOW
) == None
assert binary_search.binary_search(
my_list,
-5,
misc_tools.identity_function,
binary_search.HIGH
) == 0
assert binary_search.binary_search(
my_list,
-5,
misc_tools.identity_function,
binary_search.HIGH_OTHERWISE_LOW
) == 0
assert binary_search.binary_search(
my_list,
-5,
misc_tools.identity_function,
binary_search.LOW_OTHERWISE_HIGH
) == 0
assert binary_search.binary_search(
my_list,
100,
misc_tools.identity_function,
binary_search.BOTH
) == (4, None)
assert binary_search.binary_search(
my_list,
100,
misc_tools.identity_function,
binary_search.LOW
) == 4
assert binary_search.binary_search(
my_list,
100,
misc_tools.identity_function,
binary_search.HIGH
) == None
assert binary_search.binary_search(
my_list,
100,
misc_tools.identity_function,
binary_search.LOW_OTHERWISE_HIGH
) == 4
assert binary_search.binary_search(
my_list,
100,
misc_tools.identity_function,
binary_search.HIGH_OTHERWISE_LOW
) == 4
assert binary_search.binary_search_by_index(
[(number * 10) for number in my_list],
32,
misc_tools.identity_function,
binary_search.BOTH
) == (3, 4)
assert binary_search.binary_search(
[],
32,
misc_tools.identity_function,
binary_search.BOTH
) == (None, None)
assert binary_search.binary_search(
[],
32,
misc_tools.identity_function,
) == None
def test_single_member():
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.LOW
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.HIGH
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.HIGH_IF_BOTH
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.LOW_IF_BOTH
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.EXACT
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.BOTH
) == (7, 7)
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.CLOSEST
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.CLOSEST_IF_BOTH
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.LOW_OTHERWISE_HIGH
) == 7
assert binary_search.binary_search(
[7],
7,
misc_tools.identity_function,
binary_search.HIGH_OTHERWISE_LOW
) == 7