diff options
Diffstat (limited to 'test/ruby')
| -rw-r--r-- | test/ruby/test_integer.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb index 655f8bb1a5..e23b3929a0 100644 --- a/test/ruby/test_integer.rb +++ b/test/ruby/test_integer.rb @@ -241,4 +241,40 @@ class TestInteger < Test::Unit::TestCase end assert_equal(3 ^ 10, 3 ^ obj) end + + def test_bit_length + assert_equal(13, (-2**12-1).bit_length) + assert_equal(12, (-2**12).bit_length) + assert_equal(12, (-2**12+1).bit_length) + assert_equal(9, -0x101.bit_length) + assert_equal(8, -0x100.bit_length) + assert_equal(8, -0xff.bit_length) + assert_equal(1, -2.bit_length) + assert_equal(0, -1.bit_length) + assert_equal(0, 0.bit_length) + assert_equal(1, 1.bit_length) + assert_equal(8, 0xff.bit_length) + assert_equal(9, 0x100.bit_length) + assert_equal(9, 0x101.bit_length) + assert_equal(12, (2**12-1).bit_length) + assert_equal(13, (2**12).bit_length) + assert_equal(13, (2**12+1).bit_length) + + assert_equal(10001, (-2**10000-1).bit_length) + assert_equal(10000, (-2**10000).bit_length) + assert_equal(10000, (-2**10000+1).bit_length) + assert_equal(10000, (2**10000-1).bit_length) + assert_equal(10001, (2**10000).bit_length) + assert_equal(10001, (2**10000+1).bit_length) + + 2.upto(1000) {|i| + n = 2**i + assert_equal(i+1, (-n-1).bit_length, "(#{-n-1}).bit_length") + assert_equal(i, (-n).bit_length, "(#{-n}).bit_length") + assert_equal(i, (-n+1).bit_length, "(#{-n+1}).bit_length") + assert_equal(i, (n-1).bit_length, "#{n-1}.bit_length") + assert_equal(i+1, (n).bit_length, "#{n}.bit_length") + assert_equal(i+1, (n+1).bit_length, "#{n+1}.bit_length") + } + end end |