import pytest
from calculator import (
add, subtract, multiply, divide, power,
is_positive, is_even, logical_and, logical_or,
is_none, contains
)
def test_add():
assert add(2, 3) == 5
assert add(-1, 1) == 0
assert add(0, 0) == 0
def test_subtract():
assert subtract(5, 3) == 2
assert subtract(0, 5) == -5
def test_multiply():
assert multiply(3, 4) == 12
assert multiply(0, 5) == 0
def test_divide():
assert divide(10, 2) == 5.0
with pytest.raises(ValueError):
divide(10, 0)
def test_power():
assert power(2, 3) == 8
assert power(5, 0) == 1
def test_is_positive():
assert is_positive(5) == True
assert is_positive(-5) == False
assert is_positive(0) == False
def test_is_even():
assert is_even(4) == True
assert is_even(5) == False
def test_logical_and():
assert logical_and(True, True) == True
assert logical_and(True, False) == False
assert logical_and(False, False) == False
def test_logical_or():
assert logical_or(True, False) == True
assert logical_or(False, False) == False
def test_is_none():
assert is_none(None) == True
assert is_none(0) == False
assert is_none("") == False
def test_contains():
assert contains(1, [1, 2, 3]) == True
assert contains(4, [1, 2, 3]) == False