[ruby/securerandom] Split Random::Formatter from SecureRandom [Feature #18190]

https://github.com/ruby/securerandom/commit/1e57277b9e

4 files changed, 346 insertions, 327 deletions

diff --git a/lib/random/formatter.rb b/lib/random/formatter.rb
new file mode 100644
index 0000000000..c48886f9e0
--- /dev/null
+++ b/lib/random/formatter.rb
@@ -0,0 +1,215 @@
+# -*- coding: us-ascii -*-
+# frozen_string_literal: true
+
+# == Random number formatter.
+#
+# === Examples
+#
+# Generate random hexadecimal strings:
+#
+#   require 'random/formatter'
+#
+#   prng.hex(10) #=> "52750b30ffbc7de3b362"
+#   prng.hex(10) #=> "92b15d6c8dc4beb5f559"
+#   prng.hex(13) #=> "39b290146bea6ce975c37cfc23"
+#
+# Generate random base64 strings:
+#
+#   prng.base64(10) #=> "EcmTPZwWRAozdA=="
+#   prng.base64(10) #=> "KO1nIU+p9DKxGg=="
+#   prng.base64(12) #=> "7kJSM/MzBJI+75j8"
+#
+# Generate random binary strings:
+#
+#   prng.random_bytes(10) #=> "\016\t{\370g\310pbr\301"
+#   prng.random_bytes(10) #=> "\323U\030TO\234\357\020\a\337"
+#
+# Generate alphanumeric strings:
+#
+#   prng.alphanumeric(10) #=> "S8baxMJnPl"
+#   prng.alphanumeric(10) #=> "aOxAg8BAJe"
+#
+# Generate UUIDs:
+#
+#   prng.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
+#   prng.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
+
+module Random::Formatter
+
+  # Random::Formatter#random_bytes generates a random binary string.
+  #
+  # The argument _n_ specifies the length of the result string.
+  #
+  # If _n_ is not specified or is nil, 16 is assumed.
+  # It may be larger in future.
+  #
+  # The result may contain any byte: "\x00" - "\xff".
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.random_bytes #=> "\xD8\\\xE0\xF4\r\xB2\xFC*WM\xFF\x83\x18\xF45\xB6"
+  #   prng.random_bytes #=> "m\xDC\xFC/\a\x00Uf\xB2\xB2P\xBD\xFF6S\x97"
+  def random_bytes(n=nil)
+    n = n ? n.to_int : 16
+    gen_random(n)
+  end
+
+  # Random::Formatter#hex generates a random hexadecimal string.
+  #
+  # The argument _n_ specifies the length, in bytes, of the random number to be generated.
+  # The length of the resulting hexadecimal string is twice of _n_.
+  #
+  # If _n_ is not specified or is nil, 16 is assumed.
+  # It may be larger in the future.
+  #
+  # The result may contain 0-9 and a-f.
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.hex #=> "eb693ec8252cd630102fd0d0fb7c3485"
+  #   prng.hex #=> "91dc3bfb4de5b11d029d376634589b61"
+  def hex(n=nil)
+    random_bytes(n).unpack("H*")[0]
+  end
+
+  # Random::Formatter#base64 generates a random base64 string.
+  #
+  # The argument _n_ specifies the length, in bytes, of the random number
+  # to be generated. The length of the result string is about 4/3 of _n_.
+  #
+  # If _n_ is not specified or is nil, 16 is assumed.
+  # It may be larger in the future.
+  #
+  # The result may contain A-Z, a-z, 0-9, "+", "/" and "=".
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.base64 #=> "/2BuBuLf3+WfSKyQbRcc/A=="
+  #   prng.base64 #=> "6BbW0pxO0YENxn38HMUbcQ=="
+  #
+  # See RFC 3548 for the definition of base64.
+  def base64(n=nil)
+    [random_bytes(n)].pack("m0")
+  end
+
+  # Random::Formatter#urlsafe_base64 generates a random URL-safe base64 string.
+  #
+  # The argument _n_ specifies the length, in bytes, of the random number
+  # to be generated. The length of the result string is about 4/3 of _n_.
+  #
+  # If _n_ is not specified or is nil, 16 is assumed.
+  # It may be larger in the future.
+  #
+  # The boolean argument _padding_ specifies the padding.
+  # If it is false or nil, padding is not generated.
+  # Otherwise padding is generated.
+  # By default, padding is not generated because "=" may be used as a URL delimiter.
+  #
+  # The result may contain A-Z, a-z, 0-9, "-" and "_".
+  # "=" is also used if _padding_ is true.
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.urlsafe_base64 #=> "b4GOKm4pOYU_-BOXcrUGDg"
+  #   prng.urlsafe_base64 #=> "UZLdOkzop70Ddx-IJR0ABg"
+  #
+  #   prng.urlsafe_base64(nil, true) #=> "i0XQ-7gglIsHGV2_BNPrdQ=="
+  #   prng.urlsafe_base64(nil, true) #=> "-M8rLhr7JEpJlqFGUMmOxg=="
+  #
+  # See RFC 3548 for the definition of URL-safe base64.
+  def urlsafe_base64(n=nil, padding=false)
+    s = [random_bytes(n)].pack("m0")
+    s.tr!("+/", "-_")
+    s.delete!("=") unless padding
+    s
+  end
+
+  # Random::Formatter#uuid generates a random v4 UUID (Universally Unique IDentifier).
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
+  #   prng.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
+  #   prng.uuid #=> "62936e70-1815-439b-bf89-8492855a7e6b"
+  #
+  # The version 4 UUID is purely random (except the version).
+  # It doesn't contain meaningful information such as MAC addresses, timestamps, etc.
+  #
+  # The result contains 122 random bits (15.25 random bytes).
+  #
+  # See RFC 4122 for details of UUID.
+  #
+  def uuid
+    ary = random_bytes(16).unpack("NnnnnN")
+    ary[2] = (ary[2] & 0x0fff) | 0x4000
+    ary[3] = (ary[3] & 0x3fff) | 0x8000
+    "%08x-%04x-%04x-%04x-%04x%08x" % ary
+  end
+
+  private def gen_random(n)
+    self.bytes(n)
+  end
+
+  # Random::Formatter#choose generates a string that randomly draws from a
+  # source array of characters.
+  #
+  # The argument _source_ specifies the array of characters from which
+  # to generate the string.
+  # The argument _n_ specifies the length, in characters, of the string to be
+  # generated.
+  #
+  # The result may contain whatever characters are in the source array.
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.choose([*'l'..'r'], 16) #=> "lmrqpoonmmlqlron"
+  #   prng.choose([*'0'..'9'], 5)  #=> "27309"
+  private def choose(source, n)
+    size = source.size
+    m = 1
+    limit = size
+    while limit * size <= 0x100000000
+      limit *= size
+      m += 1
+    end
+    result = ''.dup
+    while m <= n
+      rs = random_number(limit)
+      is = rs.digits(size)
+      (m-is.length).times { is << 0 }
+      result << source.values_at(*is).join('')
+      n -= m
+    end
+    if 0 < n
+      rs = random_number(limit)
+      is = rs.digits(size)
+      if is.length < n
+        (n-is.length).times { is << 0 }
+      else
+        is.pop while n < is.length
+      end
+      result.concat source.values_at(*is).join('')
+    end
+    result
+  end
+
+  ALPHANUMERIC = [*'A'..'Z', *'a'..'z', *'0'..'9']
+  # Random::Formatter#alphanumeric generates a random alphanumeric string.
+  #
+  # The argument _n_ specifies the length, in characters, of the alphanumeric
+  # string to be generated.
+  #
+  # If _n_ is not specified or is nil, 16 is assumed.
+  # It may be larger in the future.
+  #
+  # The result may contain A-Z, a-z and 0-9.
+  #
+  #   require 'random/formatter'
+  #
+  #   prng.alphanumeric     #=> "2BuBuLf3WfSKyQbR"
+  #   prng.alphanumeric(10) #=> "i6K93NdqiH"
+  def alphanumeric(n=nil)
+    n = 16 if n.nil?
+    choose(ALPHANUMERIC, n)
+  end
+end
diff --git a/lib/securerandom.rb b/lib/securerandom.rb
index 323d4af3b7..9cbf4ea789 100644
--- a/lib/securerandom.rb
+++ b/lib/securerandom.rb
@@ -1,6 +1,8 @@
 # -*- coding: us-ascii -*-
 # frozen_string_literal: true
 
+require 'random/formatter'
+
 # == Secure random number generator interface.
 #
 # This library is an interface to secure random number generators which are
@@ -33,37 +35,8 @@
 # These methods are usable as class methods of SecureRandom such as
 # +SecureRandom.hex+.
 #
-# === Examples
-#
-# Generate random hexadecimal strings:
-#
-#   require 'securerandom'
-#
-#   SecureRandom.hex(10) #=> "52750b30ffbc7de3b362"
-#   SecureRandom.hex(10) #=> "92b15d6c8dc4beb5f559"
-#   SecureRandom.hex(13) #=> "39b290146bea6ce975c37cfc23"
-#
-# Generate random base64 strings:
-#
-#   SecureRandom.base64(10) #=> "EcmTPZwWRAozdA=="
-#   SecureRandom.base64(10) #=> "KO1nIU+p9DKxGg=="
-#   SecureRandom.base64(12) #=> "7kJSM/MzBJI+75j8"
-#
-# Generate random binary strings:
-#
-#   SecureRandom.random_bytes(10) #=> "\016\t{\370g\310pbr\301"
-#   SecureRandom.random_bytes(10) #=> "\323U\030TO\234\357\020\a\337"
-#
-# Generate alphanumeric strings:
-#
-#   SecureRandom.alphanumeric(10) #=> "S8baxMJnPl"
-#   SecureRandom.alphanumeric(10) #=> "aOxAg8BAJe"
-#
-# Generate UUIDs:
-#
-#   SecureRandom.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
-#   SecureRandom.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
-#
+# If a secure random number generator is not available,
+# +NotImplementedError+ is raised.
 
 module SecureRandom
   class << self
@@ -116,202 +89,4 @@ module SecureRandom
   end
 end
 
-module Random::Formatter
-
-  # SecureRandom.random_bytes generates a random binary string.
-  #
-  # The argument _n_ specifies the length of the result string.
-  #
-  # If _n_ is not specified or is nil, 16 is assumed.
-  # It may be larger in future.
-  #
-  # The result may contain any byte: "\x00" - "\xff".
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.random_bytes #=> "\xD8\\\xE0\xF4\r\xB2\xFC*WM\xFF\x83\x18\xF45\xB6"
-  #   SecureRandom.random_bytes #=> "m\xDC\xFC/\a\x00Uf\xB2\xB2P\xBD\xFF6S\x97"
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  def random_bytes(n=nil)
-    n = n ? n.to_int : 16
-    gen_random(n)
-  end
-
-  # SecureRandom.hex generates a random hexadecimal string.
-  #
-  # The argument _n_ specifies the length, in bytes, of the random number to be generated.
-  # The length of the resulting hexadecimal string is twice of _n_.
-  #
-  # If _n_ is not specified or is nil, 16 is assumed.
-  # It may be larger in the future.
-  #
-  # The result may contain 0-9 and a-f.
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.hex #=> "eb693ec8252cd630102fd0d0fb7c3485"
-  #   SecureRandom.hex #=> "91dc3bfb4de5b11d029d376634589b61"
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  def hex(n=nil)
-    random_bytes(n).unpack("H*")[0]
-  end
-
-  # SecureRandom.base64 generates a random base64 string.
-  #
-  # The argument _n_ specifies the length, in bytes, of the random number
-  # to be generated. The length of the result string is about 4/3 of _n_.
-  #
-  # If _n_ is not specified or is nil, 16 is assumed.
-  # It may be larger in the future.
-  #
-  # The result may contain A-Z, a-z, 0-9, "+", "/" and "=".
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.base64 #=> "/2BuBuLf3+WfSKyQbRcc/A=="
-  #   SecureRandom.base64 #=> "6BbW0pxO0YENxn38HMUbcQ=="
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  #
-  # See RFC 3548 for the definition of base64.
-  def base64(n=nil)
-    [random_bytes(n)].pack("m0")
-  end
-
-  # SecureRandom.urlsafe_base64 generates a random URL-safe base64 string.
-  #
-  # The argument _n_ specifies the length, in bytes, of the random number
-  # to be generated. The length of the result string is about 4/3 of _n_.
-  #
-  # If _n_ is not specified or is nil, 16 is assumed.
-  # It may be larger in the future.
-  #
-  # The boolean argument _padding_ specifies the padding.
-  # If it is false or nil, padding is not generated.
-  # Otherwise padding is generated.
-  # By default, padding is not generated because "=" may be used as a URL delimiter.
-  #
-  # The result may contain A-Z, a-z, 0-9, "-" and "_".
-  # "=" is also used if _padding_ is true.
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.urlsafe_base64 #=> "b4GOKm4pOYU_-BOXcrUGDg"
-  #   SecureRandom.urlsafe_base64 #=> "UZLdOkzop70Ddx-IJR0ABg"
-  #
-  #   SecureRandom.urlsafe_base64(nil, true) #=> "i0XQ-7gglIsHGV2_BNPrdQ=="
-  #   SecureRandom.urlsafe_base64(nil, true) #=> "-M8rLhr7JEpJlqFGUMmOxg=="
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  #
-  # See RFC 3548 for the definition of URL-safe base64.
-  def urlsafe_base64(n=nil, padding=false)
-    s = [random_bytes(n)].pack("m0")
-    s.tr!("+/", "-_")
-    s.delete!("=") unless padding
-    s
-  end
-
-  # SecureRandom.uuid generates a random v4 UUID (Universally Unique IDentifier).
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
-  #   SecureRandom.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
-  #   SecureRandom.uuid #=> "62936e70-1815-439b-bf89-8492855a7e6b"
-  #
-  # The version 4 UUID is purely random (except the version).
-  # It doesn't contain meaningful information such as MAC addresses, timestamps, etc.
-  #
-  # The result contains 122 random bits (15.25 random bytes).
-  #
-  # See RFC 4122 for details of UUID.
-  #
-  def uuid
-    ary = random_bytes(16).unpack("NnnnnN")
-    ary[2] = (ary[2] & 0x0fff) | 0x4000
-    ary[3] = (ary[3] & 0x3fff) | 0x8000
-    "%08x-%04x-%04x-%04x-%04x%08x" % ary
-  end
-
-  private def gen_random(n)
-    self.bytes(n)
-  end
-
-  # SecureRandom.choose generates a string that randomly draws from a
-  # source array of characters.
-  #
-  # The argument _source_ specifies the array of characters from which
-  # to generate the string.
-  # The argument _n_ specifies the length, in characters, of the string to be
-  # generated.
-  #
-  # The result may contain whatever characters are in the source array.
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.choose([*'l'..'r'], 16) #=> "lmrqpoonmmlqlron"
-  #   SecureRandom.choose([*'0'..'9'], 5)  #=> "27309"
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  private def choose(source, n)
-    size = source.size
-    m = 1
-    limit = size
-    while limit * size <= 0x100000000
-      limit *= size
-      m += 1
-    end
-    result = ''.dup
-    while m <= n
-      rs = random_number(limit)
-      is = rs.digits(size)
-      (m-is.length).times { is << 0 }
-      result << source.values_at(*is).join('')
-      n -= m
-    end
-    if 0 < n
-      rs = random_number(limit)
-      is = rs.digits(size)
-      if is.length < n
-        (n-is.length).times { is << 0 }
-      else
-        is.pop while n < is.length
-      end
-      result.concat source.values_at(*is).join('')
-    end
-    result
-  end
-
-  ALPHANUMERIC = [*'A'..'Z', *'a'..'z', *'0'..'9']
-  # SecureRandom.alphanumeric generates a random alphanumeric string.
-  #
-  # The argument _n_ specifies the length, in characters, of the alphanumeric
-  # string to be generated.
-  #
-  # If _n_ is not specified or is nil, 16 is assumed.
-  # It may be larger in the future.
-  #
-  # The result may contain A-Z, a-z and 0-9.
-  #
-  #   require 'securerandom'
-  #
-  #   SecureRandom.alphanumeric     #=> "2BuBuLf3WfSKyQbR"
-  #   SecureRandom.alphanumeric(10) #=> "i6K93NdqiH"
-  #
-  # If a secure random number generator is not available,
-  # +NotImplementedError+ is raised.
-  def alphanumeric(n=nil)
-    n = 16 if n.nil?
-    choose(ALPHANUMERIC, n)
-  end
-end
-
 SecureRandom.extend(Random::Formatter)
diff --git a/test/ruby/test_random_formatter.rb b/test/ruby/test_random_formatter.rb
new file mode 100644
index 0000000000..df3320b41c
--- /dev/null
+++ b/test/ruby/test_random_formatter.rb
@@ -0,0 +1,123 @@
+require 'test/unit'
+require 'random/formatter'
+
+module Random::Formatter
+  module FormatterTest
+    def test_random_bytes
+      assert_equal(16, @it.random_bytes.size)
+      assert_equal(Encoding::ASCII_8BIT, @it.random_bytes.encoding)
+      65.times do |idx|
+        assert_equal(idx, @it.random_bytes(idx).size)
+      end
+    end
+
+    def test_hex
+      s = @it.hex
+      assert_equal(16 * 2, s.size)
+      assert_match(/\A\h+\z/, s)
+      33.times do |idx|
+        s = @it.hex(idx)
+        assert_equal(idx * 2, s.size)
+        assert_match(/\A\h*\z/, s)
+      end
+    end
+
+    def test_hex_encoding
+      assert_equal(Encoding::US_ASCII, @it.hex.encoding)
+    end
+
+    def test_base64
+      assert_equal(16, @it.base64.unpack('m*')[0].size)
+      17.times do |idx|
+        assert_equal(idx, @it.base64(idx).unpack('m*')[0].size)
+      end
+    end
+
+    def test_urlsafe_base64
+      safe = /[\n+\/]/
+      65.times do |idx|
+        assert_not_match(safe, @it.urlsafe_base64(idx))
+      end
+      # base64 can include unsafe byte
+      assert((0..10000).any? {|idx| safe =~ @it.base64(idx)}, "None of base64(0..10000) is url-safe")
+    end
+
+    def test_random_number_float
+      101.times do
+        v = @it.random_number
+        assert_in_range(0.0...1.0, v)
+      end
+    end
+
+    def test_random_number_float_by_zero
+      101.times do
+        v = @it.random_number(0)
+        assert_in_range(0.0...1.0, v)
+      end
+    end
+
+    def test_random_number_int
+      101.times do |idx|
+        next if idx.zero?
+        v = @it.random_number(idx)
+        assert_in_range(0...idx, v)
+      end
+    end
+
+    def test_uuid
+      uuid = @it.uuid
+      assert_equal(36, uuid.size)
+
+      # Check time_hi_and_version and clock_seq_hi_res bits (RFC 4122 4.4)
+      assert_equal('4', uuid[14])
+      assert_include(%w'8 9 a b', uuid[19])
+
+      assert_match(/\A\h{8}-\h{4}-\h{4}-\h{4}-\h{12}\z/, uuid)
+    end
+
+    def test_alphanumeric
+      65.times do |n|
+        an = @it.alphanumeric(n)
+        assert_match(/\A[0-9a-zA-Z]*\z/, an)
+        assert_equal(n, an.length)
+      end
+    end
+
+    def assert_in_range(range, result, mesg = nil)
+      assert(range.cover?(result), build_message(mesg, "Expected #{result} to be in #{range}"))
+    end
+  end
+
+  module NotDefaultTest
+    def test_random_number_not_default
+      msg = "random_number should not be affected by srand"
+      seed = srand(0)
+      x = @it.random_number(1000)
+      10.times do|i|
+        srand(0)
+        return unless @it.random_number(1000) == x
+      end
+      srand(0)
+      assert_not_equal(x, @it.random_number(1000), msg)
+    ensure
+      srand(seed) if seed
+    end
+  end
+
+  class TestClassMethods < Test::Unit::TestCase
+    include FormatterTest
+
+    def setup
+      @it = Random
+    end
+  end
+
+  class TestInstanceMethods < Test::Unit::TestCase
+    include FormatterTest
+    include NotDefaultTest
+
+    def setup
+      @it = Random.new
+    end
+  end
+end
diff --git a/test/test_securerandom.rb b/test/test_securerandom.rb
index f9130ab81e..e4a0e17365 100644
--- a/test/test_securerandom.rb
+++ b/test/test_securerandom.rb
@@ -1,21 +1,17 @@
 # frozen_string_literal: false
 require 'test/unit'
 require 'securerandom'
+require_relative 'ruby/test_random_formatter'
 
 # This testcase does NOT aim to test cryptographically strongness and randomness.
 class TestSecureRandom < Test::Unit::TestCase
+  include Random::Formatter::FormatterTest
+  include Random::Formatter::NotDefaultTest
+
   def setup
     @it = SecureRandom
   end
 
-  def test_s_random_bytes
-    assert_equal(16, @it.random_bytes.size)
-    assert_equal(Encoding::ASCII_8BIT, @it.random_bytes.encoding)
-    65.times do |idx|
-      assert_equal(idx, @it.random_bytes(idx).size)
-    end
-  end
-
 # This test took 2 minutes on my machine.
 # And 65536 times loop could not be enough for forcing PID recycle.
 if false
@@ -69,96 +65,6 @@ if false
   end
 end
 
-  def test_s_hex
-    s = @it.hex
-    assert_equal(16 * 2, s.size)
-    assert_match(/\A\h+\z/, s)
-    33.times do |idx|
-      s = @it.hex(idx)
-      assert_equal(idx * 2, s.size)
-      assert_match(/\A\h*\z/, s)
-    end
-  end
-
-  def test_hex_encoding
-    assert_equal(Encoding::US_ASCII, @it.hex.encoding)
-  end
-
-  def test_s_base64
-    assert_equal(16, @it.base64.unpack('m*')[0].size)
-    17.times do |idx|
-      assert_equal(idx, @it.base64(idx).unpack('m*')[0].size)
-    end
-  end
-
-  def test_s_urlsafe_base64
-    safe = /[\n+\/]/
-    65.times do |idx|
-      assert_not_match(safe, @it.urlsafe_base64(idx))
-    end
-    # base64 can include unsafe byte
-    assert((0..10000).any? {|idx| safe =~ @it.base64(idx)}, "None of base64(0..10000) is url-safe")
-  end
-
-  def test_s_random_number_float
-    101.times do
-      v = @it.random_number
-      assert_in_range(0.0...1.0, v)
-    end
-  end
-
-  def test_s_random_number_float_by_zero
-    101.times do
-      v = @it.random_number(0)
-      assert_in_range(0.0...1.0, v)
-    end
-  end
-
-  def test_s_random_number_int
-    101.times do |idx|
-      next if idx.zero?
-      v = @it.random_number(idx)
-      assert_in_range(0...idx, v)
-    end
-  end
-
-  def test_s_random_number_not_default
-    msg = "SecureRandom#random_number should not be affected by srand"
-    seed = srand(0)
-    x = @it.random_number(1000)
-    10.times do|i|
-      srand(0)
-      return unless @it.random_number(1000) == x
-    end
-    srand(0)
-    assert_not_equal(x, @it.random_number(1000), msg)
-  ensure
-    srand(seed) if seed
-  end
-
-  def test_uuid
-    uuid = @it.uuid
-    assert_equal(36, uuid.size)
-
-    # Check time_hi_and_version and clock_seq_hi_res bits (RFC 4122 4.4)
-    assert_equal('4', uuid[14])
-    assert_include(%w'8 9 a b', uuid[19])
-
-    assert_match(/\A\h{8}-\h{4}-\h{4}-\h{4}-\h{12}\z/, uuid)
-  end
-
-  def test_alphanumeric
-    65.times do |n|
-      an = @it.alphanumeric(n)
-      assert_match(/\A[0-9a-zA-Z]*\z/, an)
-      assert_equal(n, an.length)
-    end
-  end
-
-  def assert_in_range(range, result, mesg = nil)
-    assert(range.cover?(result), build_message(mesg, "Expected #{result} to be in #{range}"))
-  end
-
   def test_with_openssl
     begin
       require 'openssl'