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Bit_arith_unit_test.rb
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Bit_arith_unit_test.rb
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#!/usr/bin/ruby -Wall
# ================================================================
# Please see LICENSE.txt in the same directory as this file.
# John Kerl
# kerl.john.r@gmail.com
# Copyright (c) 2011
# ================================================================
require 'Bit_arith.rb'
require 'test/unit'
class Bit_arith_unit_test < Test::Unit::TestCase
# ----------------------------------------------------------------
def test_msb32
assert_equal(0, Bit_arith.msb32(0x00000000))
assert_equal(1, Bit_arith.msb32(0x00000001))
assert_equal(2, Bit_arith.msb32(0x00000002))
assert_equal(2, Bit_arith.msb32(0x00000003))
assert_equal(4, Bit_arith.msb32(0x00000004))
assert_equal(0x80, Bit_arith.msb32(0x000000aa))
assert_equal(0x80, Bit_arith.msb32(0x000000ff))
assert_equal(0x8000, Bit_arith.msb32(0x0000beef))
assert_equal(0x80000000, Bit_arith.msb32(0xdeadbeef))
end
def test_msb_pos_32
assert_equal(-1, Bit_arith.msb_pos_32(0x00000000))
assert_equal(0, Bit_arith.msb_pos_32(0x00000001))
assert_equal(1, Bit_arith.msb_pos_32(0x00000002))
assert_equal(1, Bit_arith.msb_pos_32(0x00000003))
assert_equal(2, Bit_arith.msb_pos_32(0x00000004))
assert_equal(7, Bit_arith.msb_pos_32(0x000000aa))
assert_equal(7, Bit_arith.msb_pos_32(0x000000ff))
assert_equal(15, Bit_arith.msb_pos_32(0x0000beef))
assert_equal(31, Bit_arith.msb_pos_32(0xdeadbeef))
end
def test_lsb32
assert_equal(0, Bit_arith.lsb32(0x00000000))
assert_equal(1, Bit_arith.lsb32(0x00000001))
assert_equal(2, Bit_arith.lsb32(0x00000002))
assert_equal(1, Bit_arith.lsb32(0x00000003))
assert_equal(4, Bit_arith.lsb32(0x00000004))
assert_equal(2, Bit_arith.lsb32(0x000000aa))
assert_equal(1, Bit_arith.lsb32(0x000000ff))
assert_equal(1, Bit_arith.lsb32(0x0000beef))
assert_equal(1, Bit_arith.lsb32(0xdeadbeef))
end
def test_lsb_pos_32
assert_equal(-1, Bit_arith.lsb_pos_32(0x00000000))
assert_equal(0, Bit_arith.lsb_pos_32(0x00000001))
assert_equal(1, Bit_arith.lsb_pos_32(0x00000002))
assert_equal(0, Bit_arith.lsb_pos_32(0x00000003))
assert_equal(2, Bit_arith.lsb_pos_32(0x00000004))
assert_equal(1, Bit_arith.lsb_pos_32(0x000000aa))
assert_equal(0, Bit_arith.lsb_pos_32(0x000000ff))
assert_equal(0, Bit_arith.lsb_pos_32(0x0000beef))
assert_equal(0, Bit_arith.lsb_pos_32(0xdeadbeef))
end
def test_ones32
assert_equal(0, Bit_arith.ones32(0x00000000))
assert_equal(1, Bit_arith.ones32(0x00000001))
assert_equal(1, Bit_arith.ones32(0x00000002))
assert_equal(2, Bit_arith.ones32(0x00000003))
assert_equal(1, Bit_arith.ones32(0x00000004))
assert_equal(4, Bit_arith.ones32(0x000000aa))
assert_equal(8, Bit_arith.ones32(0x000000ff))
assert_equal(13, Bit_arith.ones32(0x0000beef))
assert_equal(24, Bit_arith.ones32(0xdeadbeef))
end
def test_floor_log2_32
assert_equal(-1, Bit_arith.floor_log2_32(0x00000000))
assert_equal(0, Bit_arith.floor_log2_32(0x00000001))
assert_equal(1, Bit_arith.floor_log2_32(0x00000002))
assert_equal(1, Bit_arith.floor_log2_32(0x00000003))
assert_equal(2, Bit_arith.floor_log2_32(0x00000004))
assert_equal(7, Bit_arith.floor_log2_32(0x000000aa))
assert_equal(7, Bit_arith.floor_log2_32(0x000000ff))
assert_equal(15, Bit_arith.floor_log2_32(0x0000beef))
assert_equal(31, Bit_arith.floor_log2_32(0xdeadbeef))
end
# ----------------------------------------------------------------
def test_msb
assert_equal(0, Bit_arith.msb(0x00000000))
assert_equal(1, Bit_arith.msb(0x00000001))
assert_equal(2, Bit_arith.msb(0x00000002))
assert_equal(2, Bit_arith.msb(0x00000003))
assert_equal(4, Bit_arith.msb(0x00000004))
assert_equal(0x80, Bit_arith.msb(0x000000aa))
assert_equal(0x80, Bit_arith.msb(0x000000ff))
assert_equal(0x8000, Bit_arith.msb(0x0000beef))
assert_equal(0x80000000, Bit_arith.msb(0xdeadbeef))
assert_equal(0x100000000, Bit_arith.msb(0x1deadbeef))
assert_equal(0x800000000, Bit_arith.msb(0xdeadbeefe))
(1..400).each do |x|
v = 1 << x
assert_equal(v, Bit_arith.msb(v))
assert_equal(v>>1, Bit_arith.msb(v-1))
end
end
# ----------------------------------------------------------------
def test_lsb
assert_equal(0, Bit_arith.lsb(0x00000000))
assert_equal(1, Bit_arith.lsb(0x00000001))
assert_equal(2, Bit_arith.lsb(0x00000002))
assert_equal(1, Bit_arith.lsb(0x00000003))
assert_equal(4, Bit_arith.lsb(0x00000004))
assert_equal(2, Bit_arith.lsb(0x000000aa))
assert_equal(1, Bit_arith.lsb(0x000000ff))
assert_equal(1, Bit_arith.lsb(0x0000beef))
assert_equal(1, Bit_arith.lsb(0xdeadbeef))
(1..400).each do |x|
v = 1 << x
assert_equal(v, Bit_arith.lsb(v))
end
srand 0
(5..400).each do |x|
u = 1 << x
v = (rand(64) | 1) << x
assert_equal(u, Bit_arith.lsb(v))
end
end
def test_msb_pos
assert_equal(-1, Bit_arith.msb_pos(0x00000000))
assert_equal(0, Bit_arith.msb_pos(0x00000001))
assert_equal(1, Bit_arith.msb_pos(0x00000002))
assert_equal(1, Bit_arith.msb_pos(0x00000003))
assert_equal(2, Bit_arith.msb_pos(0x00000004))
assert_equal(7, Bit_arith.msb_pos(0x000000aa))
assert_equal(7, Bit_arith.msb_pos(0x000000ff))
assert_equal(15, Bit_arith.msb_pos(0x0000beef))
assert_equal(31, Bit_arith.msb_pos(0xdeadbeef))
(1..400).each do |x|
v = 1 << x
assert_equal(x, Bit_arith.msb_pos(v))
end
srand 0
(5..400).each do |x|
v = (1 << x) | rand(1<<(x-1))
assert_equal(x, Bit_arith.msb_pos(v))
end
end
def test_lsb_pos
assert_equal(-1, Bit_arith.lsb_pos(0x00000000))
assert_equal(0, Bit_arith.lsb_pos(0x00000001))
assert_equal(1, Bit_arith.lsb_pos(0x00000002))
assert_equal(0, Bit_arith.lsb_pos(0x00000003))
assert_equal(2, Bit_arith.lsb_pos(0x00000004))
assert_equal(1, Bit_arith.lsb_pos(0x000000aa))
assert_equal(0, Bit_arith.lsb_pos(0x000000ff))
assert_equal(0, Bit_arith.lsb_pos(0x0000beef))
assert_equal(0, Bit_arith.lsb_pos(0xdeadbeef))
(1..400).each do |x|
v = 1 << x
assert_equal(x, Bit_arith.lsb_pos(v))
end
srand 0
(5..400).each do |x|
v = (rand(64) | 1) << x
assert_equal(x, Bit_arith.lsb_pos(v))
end
end
def test_ones
assert_equal(0, Bit_arith.ones(0x00000000))
assert_equal(1, Bit_arith.ones(0x00000001))
assert_equal(1, Bit_arith.ones(0x00000002))
assert_equal(2, Bit_arith.ones(0x00000003))
assert_equal(1, Bit_arith.ones(0x00000004))
assert_equal(4, Bit_arith.ones(0x000000aa))
assert_equal(8, Bit_arith.ones(0x000000ff))
assert_equal(13, Bit_arith.ones(0x0000beef))
assert_equal(24, Bit_arith.ones(0xdeadbeef))
end
end