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test/utils/bit_utils_test.exs
defmodule InPlace.Utils.BitUtilsTest do
use ExUnit.Case
alias InPlace.BitUtils
test "set_bit, unset_bit, bit_set?, bit_count, lsb, msb" do
sample_size = Enum.random(1..64)
random_positions = Enum.take_random(0..63, sample_size)
## Set bits
res = Enum.reduce(random_positions, 0,
fn p, acc -> BitUtils.set_bit(acc, p)
end)
assert BitUtils.bit_count(res) == sample_size
assert Enum.all?(0..63, fn p ->
bit_set? = BitUtils.bit_set?(res, p)
if p in random_positions do
bit_set?
else
!bit_set?
end
end)
## lsb/msb
assert BitUtils.lsb(res) == Enum.min(random_positions)
assert BitUtils.msb(res) == Enum.max(random_positions)
## Unset positions
res = Enum.reduce(random_positions, 0,
fn p, acc -> BitUtils.unset_bit(acc, p)
end)
assert BitUtils.bit_count(res) == 0
assert Enum.all?(0..63, fn p ->
!BitUtils.bit_set?(res, p)
end)
assert is_nil(BitUtils.lsb(res))
assert is_nil(BitUtils.msb(res))
end
end