assert_eq (true, true)
assert_eq (false, false)

assert_eq (true, true and true)
assert_eq (false, true and false)
assert_eq (false, false and true)
assert_eq (false, false and false)

assert_eq (true, true or true)
assert_eq (true, true or false)
assert_eq (true, false or true)
assert_eq (false, false or false)

assert_eq (true, not false)
assert_eq (false, not true)

assert_eq (true, not not true)
assert_eq (false, not not not true)