def test_binary_spanning_0():
actual = binary_search([-1, 0, 1], 0)
expect = 1
assert actual == expect
def test_binary_too_low():
actual = binary_search([1, 2, 3], 0)
expect = -1
assert actual == expect
def test_binary_val_does_not_exist():
actual = binary_search([5, 6, 9, 8, 10], 7)
expect = -1
assert actual == expect
def test_binary_negative_numbers():
actual = binary_search([-9, -8, -7, -6, -5], -7)
expect = 2
assert actual == expect
def test_binary_left():
actual = binary_search([5, 6, 7, 9, 8, 10], 5)
expect = 0
assert actual == expect
def test_binary_right():
actual = binary_search([5, 6, 7, 9, 8, 10], 10)
expect = 5
assert actual == expect
def test_binary_tiny_list():
actual = binary_search([1], 1)
expect = 0
assert actual == expect
def test_binary():
actual = binary_search([1, 2, 3], 2)
expect = 1
assert actual == expect
def test_binary_too_high():
actual = binary_search([1, 2, 3], 4)
expect = -1
assert actual == expect
