commit 85a0a65ccb6146cd769fe9fb79e679580d2754eb
Author: John Nishinaga <jingoro@casa-z.org>
Date:   Tue Mar 22 09:11:41 2011 -0400

    reset repository with new author information, license and version

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..244ec54
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+*.gem
+.bundle
+.yardoc
+Gemfile.lock
+doc
+pkg
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..7438fbe
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,2 @@
+--colour
+--format documentation
diff --git a/.yardopts b/.yardopts
new file mode 100644
index 0000000..606f097
--- /dev/null
+++ b/.yardopts
@@ -0,0 +1,3 @@
+--markup markdown
+lib/**/*.rb
+README.md MIT-LICENSE.txt
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..2778f69
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+## Version 0.1.0 / 2011-03-22
+
+  * updated license
+  * bumped version to 0.1.0
+
+## Version 0.0.1 / 2011-02-19
+
+ * initial release
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..d65e2a6
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,3 @@
+source 'http://rubygems.org'
+
+gemspec
diff --git a/MIT-LICENSE.txt b/MIT-LICENSE.txt
new file mode 100644
index 0000000..0966f96
--- /dev/null
+++ b/MIT-LICENSE.txt
@@ -0,0 +1,19 @@
+Copyright (c) 2011 Pat Deegan, PhD & Associates, LLC.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3c589c6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,58 @@
+# keepass-password-generator
+
+Generate passwords using KeePass password generator patterns.
+
+## RubyGems installation
+
+    gem install keepass-password-generator
+
+## Bundler installation
+
+In your `Gemfile`:
+
+    gem 'keepass-password-generator'
+
+Install bundled gems:
+
+    bundle
+
+## Usage
+
+    require 'keepass/password'
+
+    KeePass::Password.generate('A{6}s')
+    #=> "Un2hd#t"
+    
+See <http://keepass.info/help/base/pwgenerator.html> for information about KeePass patterns.
+
+## Examples
+
+A 40-bit WEP key:
+
+    KeePass::Password.generate('h{10}')
+    #=> "ae6929dc0e"
+
+A random MAC address:
+
+    KeePass::Password.generate('HH\-HH\-HH\-HH\-HH\-HH', :permute => false)
+    #=> "0D-4D-32-64-EB-7D"
+
+A password with 10 alphanumeric characters, where at least 2 are upper case and at least are 2 lower case characters:
+
+    KeePass::Password.generate('uullA{6}')
+    #=> "us2j1nTIQT"
+
+A password with 20 alphanumeric and symbol characters, without any lookalike characters (e.g., I and |):
+
+    KeePass::Password.generate('[As]{20}', :remove_lookalikes => true)
+    #=> "-2~[+Rze{hZezk(\\nZ-W"
+
+Invalid patterns raise an exception:
+
+    KeePass::Password.generate('[\I\|]{3}', :remove_lookalikes => true)
+    #=> KeePass::Password::InvalidPatternError: empty character set for token 1 for "[\\I\\|]{3}"
+
+## Related gems
+
+* <https://github.com/dmke/simple-password-gen>
+* <http://rubygems.org/gems/ruby-password>
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..a92853f
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,12 @@
+require 'bundler'
+Bundler.setup
+
+Bundler::GemHelper.install_tasks
+
+require 'yard'
+YARD::Rake::YardocTask.new
+
+require 'rspec/core/rake_task'
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec
diff --git a/keepass-password-generator.gemspec b/keepass-password-generator.gemspec
new file mode 100644
index 0000000..f145b28
--- /dev/null
+++ b/keepass-password-generator.gemspec
@@ -0,0 +1,28 @@
+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "keepass/password/version"
+
+Gem::Specification.new do |s|
+  s.name        = "keepass-password-generator"
+  s.version     = KeePass::Password::VERSION
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["John Nishinaga"]
+  s.email       = ["jingoro@casa-z.org"]
+  s.homepage    = "https://github.com/patdeegan/keepass-password-generator"
+  s.summary     = "keepass-password-generator-#{KeePass::Password::VERSION}"
+  s.description = "Generate passwords using KeePass password generator patterns"
+
+  s.rubyforge_project = "keepass-password-generator"
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+  
+  s.add_dependency 'activesupport', '>= 2.2.0'
+
+  s.add_development_dependency 'yard'
+  s.add_development_dependency 'bluecloth'
+  s.add_development_dependency 'rspec'
+
+end
diff --git a/lib/keepass-password-generator.rb b/lib/keepass-password-generator.rb
new file mode 100644
index 0000000..7cce01a
--- /dev/null
+++ b/lib/keepass-password-generator.rb
@@ -0,0 +1 @@
+require 'keepass/password'
diff --git a/lib/keepass/password.rb b/lib/keepass/password.rb
new file mode 100644
index 0000000..8317725
--- /dev/null
+++ b/lib/keepass/password.rb
@@ -0,0 +1,58 @@
+require 'keepass/password/char_set'
+require 'keepass/password/generator'
+require 'keepass/password/version'
+
+module KeePass
+  
+  module Password
+
+    # Returns a generated password.
+    #
+    # @param [String] pattern the pattern
+    # @param [Hash] options the options
+    # @option options [Boolean] :permute (true) whether or not to randomly permute generated passwords
+    # @option options [Boolean] :remove_lookalikes (false) whether or not to remove lookalike characters
+    # @option options [Hash] :charset_mapping (CharSet::DEFAULT_MAPPING) the KeePass character set ID mapping
+    # @return [String] the new password
+    # @raise [InvalidPatternError] if `pattern` is invalid
+    def self.generate(pattern, options = {})
+      Generator.new(pattern, options).generate
+    end
+
+    # Returns whether or not the pattern is valid.
+    #
+    # @param [String] pattern the pattern
+    # @param [Hash] options the options
+    # @option options [Boolean] :permute (true) whether or not to randomly permute generated passwords
+    # @option options [Boolean] :remove_lookalikes (false) whether or not to remove lookalike characters
+    # @option options [Hash] :charset_mapping (CharSet::DEFAULT_MAPPING) the KeePass character set ID mapping
+    # @return [Boolean] whether or not the pattern is valid
+    def self.validate_pattern(pattern, options = {})
+      begin
+        generate(pattern, options)
+        true
+      rescue InvalidPatternError
+        false
+      end
+    end
+
+    # Returns an entropy estimate of a password.
+    #
+    # @param [String] test the password to test
+    # @see http://en.wikipedia.org/wiki/Password_strength
+    def self.estimate_entropy(test)
+      chars = 0
+      chars += 26 if test =~ LOWERCASE_TEST_RE
+      chars += 26 if test =~ UPPERCASE_TEST_RE
+      chars += 10 if test =~ DIGITS_TEST_RE
+      chars += CharSet::PRINTABLE_ASCII_SPECIAL.size if test =~ SPECIAL_TEST_RE
+      if chars == 0
+        0
+      else
+        (test.size * Math.log(chars) / Math.log(2)).to_i
+      end
+    end
+  
+  end
+
+end
diff --git a/lib/keepass/password/char_set.rb b/lib/keepass/password/char_set.rb
new file mode 100644
index 0000000..41585da
--- /dev/null
+++ b/lib/keepass/password/char_set.rb
@@ -0,0 +1,91 @@
+require 'set'
+
+module KeePass
+  
+  module Password
+
+    class InvalidCharSetIDError < RuntimeError; end
+  
+    # Character sets for the KeePass password generator.
+    #
+    # @see http://keepass.info/help/base/pwgenerator.html#pattern
+    class CharSet < Set
+
+      UPPERCASE        = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+      LOWERCASE        = "abcdefghijklmnopqrstuvwxyz"
+      DIGITS           = "0123456789"
+      UPPER_CONSONANTS = "BCDFGHJKLMNPQRSTVWXYZ"
+      LOWER_CONSONANTS = "bcdfghjklmnpqrstvwxyz"
+      UPPER_VOWELS     = "AEIOU"
+      LOWER_VOWELS     = "aeiou"
+      PUNCTUATION      = ",.;:"
+      BRACKETS         = "[]{}()<>"
+      PRINTABLE_ASCII_SPECIAL = "!\"#\$%&'()*+,-./:;<=>?[\\]^_{|}~"
+      UPPER_HEX        = "0123456789ABCDEF"
+      LOWER_HEX        = "0123456789abcdef"
+      HIGH_ANSI        = (0x7f..0xfe).map { |i| i.chr }.join
+  
+      DEFAULT_MAPPING = {
+        'a' => [LOWERCASE, DIGITS],
+        'A' => [LOWERCASE, UPPERCASE, DIGITS],
+        'U' => [UPPERCASE, DIGITS],
+        'c' => [LOWER_CONSONANTS],
+        'C' => [LOWER_CONSONANTS, UPPER_CONSONANTS],
+        'z' => [UPPER_CONSONANTS],
+        'd' => [DIGITS],
+        'h' => [LOWER_HEX],
+        'H' => [UPPER_HEX],
+        'l' => [LOWERCASE],
+        'L' => [LOWERCASE, UPPERCASE],
+        'u' => [UPPERCASE],
+        'p' => [PUNCTUATION],
+        'b' => [BRACKETS],
+        's' => [PRINTABLE_ASCII_SPECIAL],
+        'S' => [UPPERCASE, LOWERCASE, DIGITS, PRINTABLE_ASCII_SPECIAL],
+        'v' => [LOWER_VOWELS],
+        'V' => [LOWER_VOWELS, UPPER_VOWELS],
+        'Z' => [UPPER_VOWELS],
+        'x' => [HIGH_ANSI],
+      }
+      
+      ASCII_MAPPING = DEFAULT_MAPPING.reject { |k, v| k == 'x' }
+      
+      # @return [Hash] the KeePass character set ID mapping
+      attr_accessor :mapping
+      
+      # Instantiates a new CharSet object.
+      #
+      # @see Set#new
+      def initialize(*args)
+        @mapping = DEFAULT_MAPPING
+        super
+      end
+
+      # Adds several characters according to the KeePass character class.
+      #
+      # @see http://keepass.info/help/base/pwgenerator.html#pattern
+      # @param [String] char_set_id the KeePass character set ID
+      # @raise [InvalidCharSetIDError] if mapping does not contain `char_set_id`
+      # @return [CharSet] self
+      def add_from_char_set_id(char_set_id)
+        if strings = mapping[char_set_id]
+          add_from_strings *strings
+        else
+          raise InvalidCharSetIDError, "no such char set ID #{char_set_id.inspect}"
+        end
+      end
+  
+      # Adds each character from one or more strings.
+      #
+      # @param [Array] *strings one or more strings to add
+      # @return [CharSet] self
+      def add_from_strings(*strings)
+        strings.each { |s| merge Set.new(s.split('')) }
+        self
+      end
+  
+    end
+
+  end
+
+end
diff --git a/lib/keepass/password/generator.rb b/lib/keepass/password/generator.rb
new file mode 100644
index 0000000..ce26c66
--- /dev/null
+++ b/lib/keepass/password/generator.rb
@@ -0,0 +1,111 @@
+require 'keepass/password/char_set'
+require 'keepass/random'
+
+module KeePass
+  
+  module Password
+
+    class InvalidPatternError < RuntimeError; end
+  
+    # Generate passwords using KeePass password generator patterns.
+    #
+    # @see http://keepass.info/help/base/pwgenerator.html
+    class Generator
+
+      # Available character sets
+      CHARSET_IDS       = CharSet::DEFAULT_MAPPING.keys.join
+
+      # ASCII printables regular expression
+      LITERALS_RE       = /[\x20-\x7e]/
+      CHAR_TOKEN_RE     = Regexp.new("([#{CHARSET_IDS}])|\\\\(#{LITERALS_RE.source})")
+      GROUP_TOKEN_RE    = Regexp.new("(#{CHAR_TOKEN_RE.source}|" + 
+                                     "\\[((#{CHAR_TOKEN_RE.source})*?)\\])" +
+                                     "(\\{(\\d+)\\})?")
+      VALIDATOR_RE      = Regexp.new("\\A(#{GROUP_TOKEN_RE.source})+\\Z")
+
+      LOOKALIKE         = "O0l1I|"
+      LOOKALIKE_CHARSET = CharSet.new.add_from_strings LOOKALIKE
+
+      # @return [String] the pattern
+      attr_reader :pattern
+    
+      # @return [Array<CharSet>] the character sets from the pattern
+      attr_reader :char_sets
+
+      # @return [Boolean] whether or not to permute the password
+      attr_accessor :permute
+
+      # Instantiates a new PasswordGenerator object.
+      #
+      # @param [String] pattern the pattern
+      # @param [Hash] options the options
+      # @option options [Boolean] :permute (true) whether or not to randomly permute generated passwords
+      # @option options [Boolean] :remove_lookalikes (false) whether or not to remove lookalike characters
+      # @option options [Hash] :charset_mapping (CharSet::DEFAULT_MAPPING) the KeePass character set ID mapping
+      # @return [PasswordGenerator] self
+      # @raise [InvalidPatternError] if `pattern` is invalid
+      def initialize(pattern, options = {})
+        @permute = options.has_key?(:permute) ? options[:permute] : true
+        @pattern = pattern
+        @char_sets = pattern_to_char_sets(pattern, options)
+      end
+
+      # Returns a new password.
+      #
+      # @return [String] a new password
+      def generate
+        result = char_sets.map { |c| Random.sample_array(c.to_a) }
+        result = Random.shuffle_array(result) if permute
+        result.join
+      end
+      
+      private
+      
+        def pattern_to_char_sets(pattern, options) #:nodoc:
+          remove_lookalikes = options[:remove_lookalikes] || false
+          mapping = options[:charset_mapping] || CharSet::DEFAULT_MAPPING
+          char_sets = []
+          i = 1
+          pattern.scan(GROUP_TOKEN_RE) do |x1, char, bs_char, char_group, x5, x6, x7, x8, repeat|
+            char_set = CharSet.new
+            char_set.mapping = mapping
+            begin
+              if char
+                char_set.add_from_char_set_id(char)
+              elsif bs_char
+                char_set.add(bs_char)
+              else
+                char_group.scan(CHAR_TOKEN_RE) do |c, e|
+                  if c
+                    char_set.add_from_char_set_id(c)
+                  else
+                    char_set.add(e)
+                  end
+                end
+              end
+            rescue InvalidCharSetIDError => e
+              raise InvalidPatternError, e.message
+            end
+            char_set -= LOOKALIKE_CHARSET if remove_lookalikes
+            if char_set.empty?
+              raise InvalidPatternError, "empty character set for token #{i} for #{pattern.inspect}"
+            end
+            (repeat ? repeat.to_i : 1).times { char_sets << char_set }
+            i += 1
+          end
+
+          if char_sets.any?
+            char_sets
+          else
+            raise InvalidPatternError, "no char sets from #{pattern.inspect}"
+          end
+
+        end
+        
+      # private
+      
+    end
+
+  end
+
+end
diff --git a/lib/keepass/password/version.rb b/lib/keepass/password/version.rb
new file mode 100644
index 0000000..28c9bdf
--- /dev/null
+++ b/lib/keepass/password/version.rb
@@ -0,0 +1,5 @@
+module KeePass
+  module Password
+    VERSION = "0.1.0"
+  end
+end
diff --git a/lib/keepass/random.rb b/lib/keepass/random.rb
new file mode 100644
index 0000000..70c9c75
--- /dev/null
+++ b/lib/keepass/random.rb
@@ -0,0 +1,38 @@
+require 'active_support/secure_random'
+
+module KeePass
+  
+  module Random
+    
+    # If `n` is a positive integer, then returns a random
+    # integer `r` such that 0 <= `r` < `n`.
+    #
+    # If `n` is 0 or unspecified, then returns a random
+    # float `r` such that 0 <= `r` < 1.
+    #
+    # @param [Integer] n the upper bound
+    # @return [Integer|Float] the random number
+    # @see ActiveSupport::SecureRandom#random_number
+    def self.random_number(n = 0)
+      ActiveSupport::SecureRandom.random_number(n)
+    end
+    
+    # Returns a randomly sampled item from the array.
+    #
+    # @param [Array] array the array to sample from
+    # @return [Object] random item or nil if no items exist
+    def self.sample_array(array)
+      array[random_number(array.size)]
+    end
+    
+    # Returns the array shuffled randomly.
+    #
+    # @param [Array] array the array to shuffle
+    # @return [Array] the shuffled array
+    def self.shuffle_array(array)
+      array.sort_by { random_number }
+    end
+    
+  end
+
+end
diff --git a/spec/char_set_spec.rb b/spec/char_set_spec.rb
new file mode 100644
index 0000000..5318943
--- /dev/null
+++ b/spec/char_set_spec.rb
@@ -0,0 +1,38 @@
+require 'spec_helper'
+
+describe KeePass::Password::CharSet do
+  
+  describe "#add_from_strings" do
+    
+    it "should add from multiple arguments" do
+      subject.add_from_strings('abc', 'cde', 'QQ')
+      subject.should == Set.new(%w(a b c d e Q))
+    end
+    
+  end
+  
+  describe "#add_from_char_set_id" do
+    
+    it "should add the digits" do
+      subject.add_from_char_set_id('d')
+      subject.should == Set.new('0'..'9')
+    end
+
+    it "should support chaining" do
+      subject.add_from_char_set_id('l').add_from_char_set_id('u')
+      subject.should == (Set.new('a'..'z') + Set.new('A'..'Z'))
+    end
+    
+    it "should allow x with default mapping" do
+      subject.add_from_char_set_id('x')
+      subject.should include(0x7f.chr)
+    end
+    
+    it "should raise an error with ASCII mapping" do
+      subject.mapping = KeePass::Password::CharSet::ASCII_MAPPING
+      expect { subject.add_from_char_set_id('x') }.to raise_error(KeePass::Password::InvalidCharSetIDError)
+    end
+    
+  end
+  
+end
diff --git a/spec/generator_spec.rb b/spec/generator_spec.rb
new file mode 100644
index 0000000..e5b6dd3
--- /dev/null
+++ b/spec/generator_spec.rb
@@ -0,0 +1,117 @@
+require 'spec_helper'
+
+describe KeePass::Password::Generator do
+
+  def char_set(*ids)
+    char_set = KeePass::Password::CharSet.new
+    ids.each { |id| char_set.add_from_char_set_id(id) }
+    char_set
+  end
+  
+  subject { described_class.new(pattern, options) }
+  let(:options) { { } }
+  let(:random_class) { KeePass::Random }
+  
+  describe "pattern 'h{10}' (40-bit WEP key)" do
+  
+    let(:pattern) { 'h{10}' }
+
+    its(:pattern) { should == 'h{10}' }
+    its(:permute) { should be_true }
+    its(:char_sets) { should have(10).items }
+
+    it "should generate 10 hex digits " do
+      random_class.should_receive(:sample_array) do |array|
+        array.sort.should == char_set('h').to_a.sort
+        '0'
+      end.exactly(10).times
+      random_class.should_receive(:shuffle_array) do |array|
+        array.sort
+      end.once
+      subject.generate.should == '0000000000'
+    end
+  
+  end
+  
+  describe "pattern 'HH\-HH\-HH\-HH\-HH\-HH', :permute => false" do
+    
+    let(:pattern) { 'HH\-HH\-HH\-HH\-HH\-HH' }
+    let(:options) { { :permute => false } }
+  
+    its(:pattern) { should == 'HH\-HH\-HH\-HH\-HH\-HH' }
+    its(:permute) { should be_false }
+    its(:char_sets) { should have(17).items }
+    
+    it "should generate a MAC address" do
+      random_class.should_receive(:sample_array) do |array|
+        if array == ['-']
+          '-'
+        else
+          array.sort.should == char_set('H').to_a.sort
+          '0'
+        end
+      end.exactly(17).times
+      random_class.should_not_receive(:shuffle_array)
+      subject.generate.should == '00-00-00-00-00-00'
+    end
+
+  end
+
+  describe "pattern 'uullA{6}'" do
+    
+    let(:pattern) { 'uullA{6}' }
+  
+    its(:pattern) { should == 'uullA{6}' }
+    its(:permute) { should be_true }
+    its(:char_sets) { should have(10).items }
+    
+    it "should generate a 10-character alphanumeric password" do
+      random_class.should_receive(:sample_array) do |array|
+        array.sort.first
+      end.exactly(10).times
+      random_class.should_receive(:shuffle_array) do |array|
+        array.sort
+      end.once
+      subject.generate.should == '000000AAaa'
+    end
+    
+  end
+  
+  describe "pattern '[As]{20}', :remove_lookalikes => true" do
+    
+    let(:pattern) { '[As]{20}' }
+    let(:options) { { :remove_lookalikes => true } }
+    
+    its(:pattern) { should == '[As]{20}' }
+    its(:permute) { should be_true }
+    its(:char_sets) { should have(20).items }
+    
+    it "should generate a 20-character password" do
+      test_set = (char_set('A', 's') - Set.new(%w(O 0 l 1 I |))).to_a.sort
+      i = 0
+      random_class.should_receive(:sample_array) do |array|
+        array.sort.should == test_set
+        result = array.sort[i]
+        i += 1
+        result
+      end.exactly(20).times
+      random_class.should_receive(:shuffle_array) do |array|
+        array.sort
+      end.once
+      subject.generate.should == '!"#$%&\'()*+,-./23456'
+    end
+    
+  end
+  
+  describe "pattern '[\\I\\|]{3}', :remove_lookalikes => true" do
+    
+    let(:pattern) { '[\I\|]{3}' }
+    let(:options) { { :remove_lookalikes => true } }
+    
+    it "should raise an error" do
+      expect { subject }.to raise_error(KeePass::Password::InvalidPatternError)
+    end
+
+  end
+  
+end
diff --git a/spec/random_spec.rb b/spec/random_spec.rb
new file mode 100644
index 0000000..362d693
--- /dev/null
+++ b/spec/random_spec.rb
@@ -0,0 +1,49 @@
+require 'spec_helper'
+
+describe KeePass::Random do
+  
+  describe "#random_number" do
+    
+    it "should use ActiveSupport::SecureRandom" do
+      ActiveSupport::SecureRandom.should_receive(:random_number).once.with(12)
+      described_class.random_number(12)
+    end
+
+    it "should accept default argument" do
+      ActiveSupport::SecureRandom.should_receive(:random_number).with(0)
+      described_class.random_number
+    end
+    
+  end
+  
+  describe "#sample_array" do
+    
+    it "should call random_number with the array size" do
+      described_class.should_receive(:random_number).with(6).and_return(3)
+      described_class.sample_array(%w(a b c d e f)).should == 'd'
+    end
+    
+    it "should return expected values for deterministic random number" do
+      described_class.stub(:random_number) { |arg| 0 }
+      described_class.sample_array(%w(a b c)).should == 'a'
+      described_class.sample_array(%w(b a c)).should == 'b'
+      described_class.sample_array(%w(c b a)).should == 'c'
+    end
+    
+  end
+  
+  describe "#shuffle_array" do
+
+    it "should call random_number with no parameters" do
+      described_class.should_receive(:random_number).with().at_least(5).times.and_return(0.5)
+      described_class.shuffle_array(%w(a b c d e))
+    end
+    
+    it "should return the same elements" do
+      described_class.stub(:random_number) { 0.5 }
+      described_class.shuffle_array(%w(a b c d e)).sort.should == %w(a b c d e)
+    end
+
+  end
+  
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..ec4d49b
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,32 @@
+$:.unshift File.expand_path('../../lib', __FILE__)
+
+require 'rspec'
+require 'keepass/password/generator'
+
+# module DeterministicRandomness
+#   
+#   def deterministic_random_number(&block)
+#     ActiveSupport::SecureRandom.stub(:random_number) do |arg|
+#       if block
+#         block.call(arg)
+#       else
+#         0
+#       end
+#     end
+#   end
+#   
+#   # def deterministic_shuffle
+#   #   Array.any_instance.stub(:shuffle!)
+#   # end
+# 
+# end
+# 
+# RSpec.configure do |config|
+#   config.include DeterministicRandomness
+# end
+
+# RSpec::Matchers.define :have_char_set_length_of do |expected|
+#   match do |actual|
+#     actual.char_sets.size == expected
+#   end
+# end