def test_binary():
actual1 = BinarySearch([50, 90, 120, 500], 50)
actual2 = BinarySearch([50, 90, 120, 500], 500)
actual3 = BinarySearch([50, 90, 120, 500], 600)
expected1 = 0
expected2 = 3
expected3 = -1
assert actual1 == expected1
assert actual2 == expected2
assert actual3 == expected3
def test_binary2():
actual = BinarySearch([11, 22, 33, 44, 55, 66, 77], 90)
expected = -1
assert actual == expected
def test_binary1():
actual = BinarySearch([4, 8, 15, 16, 23, 42], 15)
expected = 2
assert actual == expected
def test_binary3():
actual = BinarySearch([1, 2, 3, 5, 6, 7], 4)
expected = -1
assert actual == expected
def test_BinarySearch_one():
actual = BinarySearch([4, 8, 15, 16, 23, 42], 15)
expected = 2
assert actual == expected, 'must return the index of the array’s element that is equal to the search key'
def test_BinarySearch_three():
actual = BinarySearch([1, 2, 3, 5, 6, 7], 4)
expected = -1
assert actual == expected, 'must return -1 if the element does not exist'
def test_BinarySearch_two():
actual = BinarySearch([11, 22, 33, 44, 55, 66, 77], 90)
expected = -1
assert actual == expected, 'must return -1 if the element does not exist'
def test_BinarySearch():
expected = 4
actual = BinarySearch([2, 3, 6, 8, 9], 9)
assert actual == expected
def test2_BinarySearch():
expected = -1
actual = BinarySearch([2, 3, 6, 8, 9], 5)
assert actual == expected
def test_BinarySearch2():
excepted = -1
actual = BinarySearch([11, 22, 33, 44, 55, 66, 77], 90)
assert actual == excepted
def test_BinarySearch():
excepted = 2
actual = BinarySearch([4, 8, 15, 16, 23, 42], 15)
assert actual == excepted
def test_BinarySearch3():
excepted = -1
actual = BinarySearch([1, 2, 3, 5, 6, 7], 4)
assert actual == excepted
def test_one():
actual = BinarySearch(arry, x)
expected = 2
assert actual == expected
def test_two():
actual = BinarySearch(arry, x)
expected = -1
assert actual == expected