Merge pull request #59 from juanhebert/patch-1

Fix typo in about_pattern_matching.rb

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: CI
+on: [push]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install Ruby!
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2.2"
+
+      - name: run tests
+        run: rake test

.gitignore

@@ -1,5 +1,8 @@
 dist
 .project_env.rc
 .path_progress
+.rvmrc
+.ruby-version
 *.rbc
 koans/*
+*~

DEPLOYING

@@ -0,0 +1,12 @@
+= Deploying a new Ruby Koans ZIP file
+
+The "Download" button on the rubykoans.com web-site points to the
+download/rubykoans.zip file in the github repository. So to update the
+download target on the web-site, just rebuild the .zip file, commit
+and push the changes.
+
+    rake package
+    git add download
+    git push
+
+That's it.

README.rdoc

@@ -1,18 +1,18 @@
-= EdgeCase Ruby Koans
+= Ruby Koans
 
 The Ruby Koans walk you along the path to enlightenment in order to learn Ruby.
 The goal is to learn the Ruby language, syntax, structure, and some common
-functions and libraries. We also teach you culture. Testing is not just something we
-pay lip service to, but something we live.  It is essential in your quest to learn
-and do great things in the language.
+functions and libraries. We also teach you culture by basing the koans on tests.
+Testing is not just something we pay lip service to, but something we
+live.  Testing is essential in your quest to learn and do great things in Ruby.
 
 == The Structure
 
-The koans are broken out into areas by file, hashes are covered in about_hashes.rb,
-modules are introduced in about_modules.rb, etc.  They are presented in order in the
-path_to_enlightenment.rb file.
+The koans are broken out into areas by file, hashes are covered in +about_hashes.rb+,
+modules are introduced in +about_modules.rb+, <em>etc</em>.  They are presented in
+order in the +path_to_enlightenment.rb+ file.
 
-Each koan builds up your knowledge of Ruby and builds upon itself.  It will stop at
+Each koan builds up your knowledge of Ruby and builds upon itself. It will stop at
 the first place you need to correct.
 
 Some koans simply need to have the correct answer substituted for an incorrect one.
@@ -23,30 +23,41 @@ make it work correctly.
 == Installing Ruby
 
 If you do not have Ruby setup, please visit http://ruby-lang.org/en/downloads/ for
-operating specific instructions.  In order to run this you need ruby and rake
-installed. To check the installations simply type:
+operating specific instructions.  In order to run the koans you need +ruby+ and
++rake+ installed. To check your installations simply type:
 
 *nix platforms from any terminal window:
 
    [~] $ ruby --version
    [~] $ rake --version
 
-Windows from the command prompt (cmd.exe)
+Windows from the command prompt (+cmd.exe+)
 
    c:\ruby --version
    c:\rake --version
 
-If you don't have rake installed, just run `gem install rake`
+If you don't have +rake+ installed, just run <code>gem install rake</code>
 
 Any response for Ruby with a version number greater than 1.8 is fine (should be
-around 1.8.6 or more). Any version of rake will do.
+around 1.8.6 or more). Any version of +rake+ will do.
+
+== Generating the Koans
+
+A fresh checkout will not include the koans, you will need to generate
+them.
+
+    [ruby_koans] $ rake gen                       # generates the koans directory
+
+If you need to regenerate the koans, thus wiping your current `koans`,
+
+    [ruby_koans] $ rake regen                     # regenerates the koans directory, wiping the original
 
 == The Path To Enlightenment
 
-You can run the tests through rake or by calling the file itself (rake is the
+You can run the tests through +rake+ or by calling the file itself (+rake+ is the
 recommended way to run them as we might build more functionality into this task).
 
-*nix platforms, from the koans directory
+*nix platforms, from the +ruby_koans+ directory
 
     [ruby_koans] $ rake                           # runs the default target :walk_the_path
     [ruby_koans] $ ruby path_to_enlightenment.rb  # simply call the file directly
@@ -58,54 +69,88 @@ Windows is the same thing
 
 === Red, Green, Refactor
 
-In test-driven development the mantra has always been, red, green, refactor.  Write a
-failing test and run it (red), make the test pass (green), then refactor it (that is
-look at the code and see if you can make it any better.  In this case you will need
-to run the koan and see it fail (red), make the test pass (green), then take a
-moment and reflect upon the test to see what it is teaching you and improve the
-code to better communicate its intent (refactor).
+In test-driven development the mantra has always been <em>red, green, refactor</em>.
+Write a failing test and run it (<em>red</em>), make the test pass (<em>green</em>),
+then look at the code and consider if you can make it any better (<em>refactor</em>).
 
-The very first time you run it you will see the following output:
+While walking the path to Ruby enlightenment you will need to run the koan and
+see it fail (<em>red</em>), make the test pass (<em>green</em>), then take a moment
+and reflect upon the test to see what it is teaching you and improve the code to
+better communicate its intent (<em>refactor</em>).
+
+The very first time you run the koans you will see the following output:
 
     [ ruby_koans ] $ rake
     (in /Users/person/dev/ruby_koans)
-    cd koans
+    /usr/bin/ruby1.8 path_to_enlightenment.rb
 
-    Thinking AboutAsserts
-      test_assert_truth has damaged your karma.
+    AboutAsserts#test_assert_truth has damaged your karma.
 
-    You have not yet reached enlightenment ...
+    The Master says:
+    You have not yet reached enlightenment.
+
+    The answers you seek...
     <false> is not true.
 
     Please meditate on the following code:
     ./about_asserts.rb:10:in `test_assert_truth'
-    path_to_enlightenment.rb:27
+    path_to_enlightenment.rb:38:in `each_with_index'
+    path_to_enlightenment.rb:38
 
     mountains are merely mountains
+    your path thus far [X_________________________________________________] 0/280 (0%)
 
-You have come to your first stage. If you notice it is telling you where to look for
+You have come to your first stage. Notice it is telling you where to look for
 the first solution:
 
     Please meditate on the following code:
     ./about_asserts.rb:10:in `test_assert_truth'
-    path_to_enlightenment.rb:27
+    path_to_enlightenment.rb:38:in `each_with_index'
+    path_to_enlightenment.rb:38
 
-We then open up the about_asserts.rb file and look at the first test:
+Open the +about_asserts.rb+ file and look at the first test:
 
     # We shall contemplate truth by testing reality, via asserts.
     def test_assert_truth
       assert false                # This should be true
     end
 
-We then change the +false+ to +true+ and run the test again.  After you are
+Change the +false+ to +true+ and re-run the test.  After you are
 done, think about what you are learning.  In this case, ignore everything except
 the method name (+test_assert_truth+) and the parts inside the method (everything
 before the +end+).
 
 In this case the goal is for you to see that if you pass a value to the +assert+
-method, it will either ensure it is +true+ and continue on, or fail if in fact
+method, it will either ensure it is +true+ and continue on, or fail if
 the statement is +false+.
 
+=== Running the Koans automatically
+
+<em>This section is optional.</em>
+
+Normally the path to enlightenment looks like this:
+
+    cd ruby_koans
+    rake
+    # edit
+    rake
+    # edit
+    rake
+    # etc
+
+If you prefer, you can keep the koans running in the background so that after you
+make a change in your editor, the koans will immediately run again. This will
+hopefully keep your focus on learning Ruby instead of on the command line.
+
+Install the Ruby gem (library) called +observr+ and then ask it to
+"watch" the koans for changes:
+
+    cd ruby_koans
+    rake
+    # decide to run rake automatically from now on as you edit
+    gem install observr
+    observr ./koans.watchr
+
 == Inspiration
 
 A special thanks to Mike Clark and Ara Howard for inspiring this
@@ -132,9 +177,9 @@ Brian Marick's fantastic guide for beginners Everyday Scripting with Ruby    ::
 
 = Other stuff
 
-Author         :: Jim Weirich <jim@weirichhouse.org>
-Author         :: Joe O'Brien <joe@edgecase.com>
-Issue Tracker  :: http://www.pivotaltracker.com/projects/48111
+Author         :: Jim Weirich <jim@neo.org>
+Author         :: Joe O'Brien <joe@objo.com>
+Issue Tracker  :: https://github.com/edgecase/ruby_koans/issues
 Requires       :: Ruby 1.8.x or later and Rake (any recent version)
 
 = License

Rakefile

@@ -2,25 +2,17 @@
 # -*- ruby -*-
 
 require 'rake/clean'
-begin
-  require 'rdoc/task'
-rescue LoadError => ex
-  # No rdoc task availble.
-end
 
 SRC_DIR      = 'src'
 PROB_DIR     = 'koans'
-DIST_DIR     = 'dist'
+DOWNLOAD_DIR = 'download'
 
 SRC_FILES = FileList["#{SRC_DIR}/*"]
 KOAN_FILES = SRC_FILES.pathmap("#{PROB_DIR}/%f")
 
-today    = Time.now.strftime("%Y-%m-%d")
-TAR_FILE = "#{DIST_DIR}/rubykoans-#{today}.tgz"
-ZIP_FILE = "#{DIST_DIR}/rubykoans-#{today}.zip"
+ZIP_FILE = "#{DOWNLOAD_DIR}/rubykoans.zip"
 
 CLEAN.include("**/*.rbc")
-CLOBBER.include(DIST_DIR)
 
 module Koans
   extend Rake::DSL if defined?(Rake::DSL)
@@ -40,10 +32,8 @@ module Koans
   end
 
   def Koans.make_koan_file(infile, outfile)
-    if infile =~ /edgecase/
+    if infile =~ /neo/
       cp infile, outfile
-    elsif infile =~ /autotest/
-      cp_r infile, outfile
     else
       open(infile) do |ins|
         open(outfile, "w") do |outs|
@@ -88,34 +78,29 @@ end
 task :default => :walk_the_path
 
 task :walk_the_path do
-  cd 'koans'
+  cd PROB_DIR
   ruby 'path_to_enlightenment.rb'
 end
 
-if defined?(Rake::RDocTask)
-  Rake::RDocTask.new do |rd|
-    rd.main = "README.rdoc"
-    rd.rdoc_files.include("README.rdoc", "koans/*.rb")
-  end
-end
-
-directory DIST_DIR
+directory DOWNLOAD_DIR
 directory PROB_DIR
 
-file ZIP_FILE => KOAN_FILES + [DIST_DIR] do
+desc "(re)Build zip file"
+task :zip => [:clobber_zip, :package]
+
+task :clobber_zip do
+  rm ZIP_FILE
+end
+
+file ZIP_FILE => KOAN_FILES + [DOWNLOAD_DIR] do
   sh "zip #{ZIP_FILE} #{PROB_DIR}/*"
 end
 
-file TAR_FILE => KOAN_FILES + [DIST_DIR] do
-  sh "tar zcvf #{TAR_FILE} #{PROB_DIR}"
-end
-
 desc "Create packaged files for distribution"
-task :package => [TAR_FILE, ZIP_FILE]
+task :package => [ZIP_FILE]
 
 desc "Upload the package files to the web server"
-task :upload => [TAR_FILE, ZIP_FILE] do
-  sh "scp #{TAR_FILE} linode:sites/onestepback.org/download"
+task :upload => [ZIP_FILE] do
   sh "scp #{ZIP_FILE} linode:sites/onestepback.org/download"
 end
 
@@ -140,7 +125,7 @@ end
 
 task :run do
   puts 'koans'
-  Dir.chdir("src") do
+  Dir.chdir("#{SRC_DIR}") do
     puts "in #{Dir.pwd}"
     sh "ruby path_to_enlightenment.rb"
   end

rakelib/test.rake

@@ -0,0 +1,9 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << "tests"
+  t.test_files = FileList["tests/**/*_test.rb"]
+  t.verbose = true
+end
+desc 'Run tests'
+

src/about_array_assignment.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutArrayAssignment < EdgeCase::Koan
+class AboutArrayAssignment < Neo::Koan
   def test_non_parallel_assignment
     names = ["John", "Smith"]
     assert_equal __(["John", "Smith"]), names
@@ -24,7 +24,7 @@ class AboutArrayAssignment < EdgeCase::Koan
     assert_equal __(["Smith","III"]), last_name
   end
 
-  def test_parallel_assignments_with_too_few_variables
+  def test_parallel_assignments_with_too_few_values
     first_name, last_name = ["Cher"]
     assert_equal __("Cher"), first_name
     assert_equal __(nil), last_name

src/about_arrays.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutArrays < EdgeCase::Koan
+class AboutArrays < Neo::Koan
   def test_creating_arrays
     empty_array = Array.new
     assert_equal __(Array), empty_array.class

src/about_asserts.rb

@@ -1,9 +1,9 @@
 #!/usr/bin/env ruby
 # -*- ruby -*-
 
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutAsserts < EdgeCase::Koan
+class AboutAsserts < Neo::Koan
 
   # We shall contemplate truth by testing reality, via asserts.
   def test_assert_truth

src/about_blocks.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutBlocks < EdgeCase::Koan
+class AboutBlocks < Neo::Koan
   def method_with_block
     result = yield
     result
@@ -23,7 +23,7 @@ class AboutBlocks < EdgeCase::Koan
   end
 
   def test_blocks_can_take_arguments
-    result = method_with_block_arguments do |argument|
+    method_with_block_arguments do |argument|
       assert_equal __("Jim"), argument
     end
   end
@@ -70,7 +70,7 @@ class AboutBlocks < EdgeCase::Koan
     add_one = lambda { |n| n + 1 }
     assert_equal __(11), add_one.call(10)
 
-    # Alternative calling sequence
+    # Alternative calling syntax
     assert_equal __(11), add_one[10]
   end
 

src/about_class_methods.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutClassMethods < EdgeCase::Koan
+class AboutClassMethods < Neo::Koan
   class Dog
   end
 
@@ -47,7 +47,7 @@ class AboutClassMethods < EdgeCase::Koan
   end
 
   # ------------------------------------------------------------------
-  
+
   class Dog2
     def wag
       :instance_level_wag
@@ -96,14 +96,13 @@ class AboutClassMethods < EdgeCase::Koan
   def test_you_can_define_class_methods_inside_the_class
     assert_equal __(:dogs_class_method), Dog.a_class_method
   end
-      
 
   # ------------------------------------------------------------------
 
   LastExpressionInClassStatement = class Dog
                                      21
                                    end
-  
+
   def test_class_statements_return_the_value_of_their_last_expression
     assert_equal __(21), LastExpressionInClassStatement
   end

src/about_classes.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutClasses < EdgeCase::Koan
+class AboutClasses < Neo::Koan
   class Dog
   end
 
@@ -147,7 +147,7 @@ class AboutClasses < EdgeCase::Koan
     end
 
     def to_s
-      __(@name)
+      @name
     end
 
     def inspect

src/about_constants.rb

@@ -1,8 +1,8 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 C = "top level"
 
-class AboutConstants < EdgeCase::Koan
+class AboutConstants < Neo::Koan
 
   C = "nested"
 

src/about_control_statements.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutControlStatements < EdgeCase::Koan
+class AboutControlStatements < Neo::Koan
 
   def test_if_then_else_statements
     if true
@@ -131,4 +131,12 @@ class AboutControlStatements < EdgeCase::Koan
     assert_equal [__("FISH"), __("AND"), __("CHIPS")], result
   end
 
+  def test_times_statement
+    sum = 0
+    10.times do
+      sum += 1
+    end
+    assert_equal __(10), sum
+  end
+
 end

src/about_dice_project.rb

@@ -1,4 +1,4 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # Implement a DiceSet Class here:
 #
@@ -15,7 +15,7 @@ class DiceSet
 end
 
 #++
-class AboutDiceProject < EdgeCase::Koan
+class AboutDiceProject < Neo::Koan
   def test_can_create_a_dice_set
     dice = DiceSet.new
     assert_not_nil dice
@@ -56,7 +56,7 @@ class AboutDiceProject < EdgeCase::Koan
     #
     # If the rolls are random, then it is possible (although not
     # likely) that two consecutive rolls are equal.  What would be a
-    # better way to test this.
+    # better way to test this?
   end
 
   def test_you_can_roll_different_numbers_of_dice

src/about_exceptions.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutExceptions < EdgeCase::Koan
+class AboutExceptions < Neo::Koan
 
   class MySpecialError < RuntimeError
   end
@@ -48,7 +48,7 @@ class AboutExceptions < EdgeCase::Koan
     result = nil
     begin
       fail "Oops"
-    rescue StandardError => ex
+    rescue StandardError
       # no code here
     ensure
       result = :always_run

src/about_hashes.rb

@@ -1,10 +1,10 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutHashes < EdgeCase::Koan
+class AboutHashes < Neo::Koan
   def test_creating_hashes
     empty_hash = Hash.new
     assert_equal __(Hash), empty_hash.class
-    assert_equal({}, empty_hash) # __
+    assert_equal(__({}), empty_hash)
     assert_equal __(0), empty_hash.size
   end
 
@@ -37,7 +37,7 @@ class AboutHashes < EdgeCase::Koan
     hash[:one] = "eins"
 
     expected = { :one => __("eins"), :two => "dos" }
-    assert_equal __(true), expected == hash
+    assert_equal __(expected), hash
 
     # Bonus Question: Why was "expected" broken out into a variable
     # rather than used as a literal?
@@ -113,4 +113,14 @@ class AboutHashes < EdgeCase::Koan
     assert_equal __(["dos"]), hash[:two]
     assert_equal __([]), hash[:three]
   end
+
+  def test_default_value_attribute
+    hash = Hash.new
+
+    assert_equal __(nil), hash[:some_key]
+
+    hash.default = 'peanut'
+
+    assert_equal __('peanut'), hash[:some_key]
+  end
 end

src/about_inheritance.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutInheritance < EdgeCase::Koan
+class AboutInheritance < Neo::Koan
   class Dog
     attr_reader :name
 

src/about_iteration.rb

@@ -1,12 +1,12 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutIteration < EdgeCase::Koan
+class AboutIteration < Neo::Koan
 
   # -- An Aside ------------------------------------------------------
-  # Ruby 1.8 stores names as strings. Ruby 1.9 stores names as
-  # symbols. So we use a version dependent method "as_name" to convert
-  # to the right format in the koans.  We will use "as_name" whenever
-  # comparing to lists of methods.
+  # Ruby 1.8 stores names as strings. Ruby 1.9 and later stores names
+  # as symbols. So we use a version dependent method "as_name" to
+  # convert to the right format in the koans. We will use "as_name"
+  # whenever comparing to lists of methods.
 
   in_ruby_version("1.8") do
     def as_name(name)
@@ -14,7 +14,7 @@ class AboutIteration < EdgeCase::Koan
     end
   end
 
-  in_ruby_version("1.9") do
+  in_ruby_version("1.9", "2", "3") do
     def as_name(name)
       name.to_sym
     end
@@ -39,19 +39,17 @@ class AboutIteration < EdgeCase::Koan
   def test_each_can_use_curly_brace_blocks_too
     array = [1, 2, 3]
     sum = 0
-    array.each { |item|
-      sum += item
-    }
+    array.each { |item| sum += item }
     assert_equal __(6), sum
   end
 
   def test_break_works_with_each_style_iterations
     array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
     sum = 0
-    array.each { |item|
+    array.each do |item|
       break if item > 3
       sum += item
-    }
+    end
     assert_equal __(6), sum
   end
 
@@ -86,7 +84,7 @@ class AboutIteration < EdgeCase::Koan
     result = [2, 3, 4].inject(0) { |sum, item| sum + item }
     assert_equal __(9), result
 
-    result2 = [2, 3, 4].inject(1) { |sum, item| sum * item }
+    result2 = [2, 3, 4].inject(1) { |product, item| product * item }
     assert_equal __(24), result2
 
     # Extra Credit:

src/about_java_interop.rb

@@ -1,4 +1,4 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 include Java
 
@@ -11,7 +11,7 @@ include Java
 # * Calling custom java class
 # * Calling Ruby from java???
 
-class AboutJavaInterop < EdgeCase::Koan
+class AboutJavaInterop < Neo::Koan
   def test_using_a_java_library_class
     java_array = java.util.ArrayList.new
     assert_equal __(Java::JavaUtil::ArrayList), java_array.class

src/about_keyword_arguments.rb

@@ -0,0 +1,43 @@
+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutKeywordArguments < Neo::Koan
+
+  def method_with_keyword_arguments(one: 1, two: 'two')
+    [one, two]
+  end
+
+  def test_keyword_arguments
+    assert_equal __(Array), method_with_keyword_arguments.class
+    assert_equal __([1, 'two']), method_with_keyword_arguments
+    assert_equal __(['one', 'two']), method_with_keyword_arguments(one: 'one')
+    assert_equal __([1, 2]), method_with_keyword_arguments(two: 2)
+  end
+
+  def method_with_keyword_arguments_with_mandatory_argument(one, two: 2, three: 3)
+    [one, two, three]
+  end
+
+  def test_keyword_arguments_with_wrong_number_of_arguments
+    exception = assert_raise (___(ArgumentError)) do
+      method_with_keyword_arguments_with_mandatory_argument
+    end
+    assert_match(/#{__("wrong number of arguments")}/, exception.message)
+  end
+
+  def method_with_mandatory_keyword_arguments(one:, two: 'two')
+    [one, two]
+  end
+
+  def test_mandatory_keyword_arguments
+    assert_equal __(['one', 'two']), method_with_mandatory_keyword_arguments(one: 'one')
+    assert_equal __([1, 2]), method_with_mandatory_keyword_arguments(two: 2, one: 1)
+  end
+
+  def test_mandatory_keyword_arguments_without_mandatory_argument
+    exception = assert_raise(___(ArgumentError)) do
+      method_with_mandatory_keyword_arguments
+    end
+    assert_match(/#{__("missing keyword: :one")}/, exception.message)
+  end
+
+end

src/about_message_passing.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutMessagePassing < EdgeCase::Koan
+class AboutMessagePassing < Neo::Koan
 
   class MessageCatcher
     def caught?
@@ -63,6 +63,13 @@ class AboutMessagePassing < EdgeCase::Koan
     assert_equal __([3, 4, nil, 6]), mc.send(:add_a_payload, 3, 4, nil, 6)
   end
 
+  # NOTE:
+  #
+  # Both obj.msg and obj.send(:msg) sends the message named :msg to
+  # the object. We use "send" when the name of the message can vary
+  # dynamically (e.g. calculated at run time), but by far the most
+  # common way of sending a message is just to say: obj.msg.
+
   # ------------------------------------------------------------------
 
   class TypicalObject
@@ -93,11 +100,11 @@ class AboutMessagePassing < EdgeCase::Koan
     # NOTE:
     #
     # In Ruby 1.8 the method_missing method is public and can be
-    # called as shown above.  However, in Ruby 1.9 the method_missing
-    # method is private.  We explicitly made it public in the testing
-    # framework so this example works in both versions of Ruby.  Just
-    # keep in mind you can't call method_missing like that in Ruby
-    # 1.9. normally.
+    # called as shown above. However, in Ruby 1.9 (and later versions)
+    # the method_missing method is private. We explicitly made it
+    # public in the testing framework so this example works in both
+    # versions of Ruby. Just keep in mind you can't call
+    # method_missing like that after Ruby 1.9 normally.
     #
     # Thanks.  We now return you to your regularly scheduled Ruby
     # Koans.
@@ -122,7 +129,7 @@ class AboutMessagePassing < EdgeCase::Koan
   def test_catching_messages_makes_respond_to_lie
     catcher = AllMessageCatcher.new
 
-    assert_nothing_raised(NoMethodError) do # __
+    assert_nothing_raised do # __
       catcher.any_method
     end
     assert_equal __(false), catcher.respond_to?(:any_method)

src/about_methods.rb

@@ -1,10 +1,10 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 def my_global_method(a,b)
   a + b
 end
 
-class AboutMethods < EdgeCase::Koan
+class AboutMethods < Neo::Koan
 
   def test_calling_global_methods
     assert_equal __(5), my_global_method(2,3)
@@ -37,8 +37,9 @@ class AboutMethods < EdgeCase::Koan
     #
   end
 
-  # NOTE: wrong number of argument is not a SYNTAX error, but a
+  # NOTE: wrong number of arguments is not a SYNTAX error, but a
   # runtime error.
+  # tip: When regex contains parentheses, you must escape them with backslash.
   def test_calling_global_methods_with_wrong_number_of_arguments
     exception = assert_raise(___(ArgumentError)) do
       my_global_method
@@ -126,11 +127,13 @@ class AboutMethods < EdgeCase::Koan
     assert_equal __("a secret"), my_private_method
   end
 
-  def test_calling_private_methods_with_an_explicit_receiver
-    exception = assert_raise(___(NoMethodError)) do
-      self.my_private_method
+  if before_ruby_version("2.7")   # https://github.com/edgecase/ruby_koans/issues/12
+    def test_calling_private_methods_with_an_explicit_receiver
+      exception = assert_raise(___(NoMethodError)) do
+        self.my_private_method
+      end
+      assert_match /#{__("method `my_private_method'")}/, exception.message
     end
-    assert_match /#{__("private method `my_private_method' called ")}/, exception.message
   end
 
   # ------------------------------------------------------------------

src/about_modules.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutModules < EdgeCase::Koan
+class AboutModules < Neo::Koan
   module Nameable
     def set_name(new_name)
       @name = new_name
@@ -44,7 +44,7 @@ class AboutModules < EdgeCase::Koan
 
   def test_module_methods_are_also_available_in_the_object
     fido = Dog.new
-    assert_nothing_raised(Exception) do # __
+    assert_nothing_raised do # __
       fido.set_name("Rover")
     end
   end

src/about_nil.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutNil < EdgeCase::Koan
+class AboutNil < Neo::Koan
   def test_nil_is_an_object
     assert_equal __(true), nil.is_a?(Object), "Unlike NULL in other languages"
   end

src/about_objects.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutObjects < EdgeCase::Koan
+class AboutObjects < Neo::Koan
   def test_everything_is_an_object
     assert_equal __(true), 1.is_a?(Object)
     assert_equal __(true), 1.5.is_a?(Object)
@@ -21,7 +21,7 @@ class AboutObjects < EdgeCase::Koan
 
   def test_every_object_has_an_id
     obj = Object.new
-    assert_equal __(Fixnum), obj.object_id.class
+    assert obj.object_id.is_a?(__(Integer))
   end
 
   def test_every_object_has_different_id
@@ -30,12 +30,6 @@ class AboutObjects < EdgeCase::Koan
     assert_equal __(true), obj.object_id != another_obj.object_id
   end
 
-  def test_some_system_objects_always_have_the_same_id
-    assert_equal __(0), false.object_id
-    assert_equal __(2), true.object_id
-    assert_equal __(4), nil.object_id
-  end
-
   def test_small_integers_have_fixed_ids
     assert_equal __(1), 0.object_id
     assert_equal __(3), 1.object_id

src/about_open_classes.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutOpenClasses < EdgeCase::Koan
+class AboutOpenClasses < Neo::Koan
   class Dog
     def bark
       "WOOF"
@@ -30,16 +30,16 @@ class AboutOpenClasses < EdgeCase::Koan
   # ------------------------------------------------------------------
 
   class ::Integer
-    def even?
-      (self % 2) == 0
+    def answer_to_life_universe_and_everything?
+      self == 42
     end
   end
 
   def test_even_existing_built_in_classes_can_be_reopened
-    assert_equal __(false), 1.even?
-    assert_equal __(true), 2.even?
+    assert_equal __(false), 1.answer_to_life_universe_and_everything?
+    assert_equal __(true), 42.answer_to_life_universe_and_everything?
   end
 
   # NOTE: To understand why we need the :: before Integer, you need to
-  # become enlightened about scope.  
+  # become enlightened about scope.
 end

src/about_pattern_matching.rb

@@ -0,0 +1,215 @@
+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutPatternMatching < Neo::Koan
+
+  def test_pattern_may_not_match
+    begin
+      case [true, false]
+      in [a, b] if a == b # The condition after pattern is called guard.
+        :match
+      end
+    rescue Exception => ex
+      # What exception has been caught?
+      assert_equal __, ex.class
+    end
+  end
+
+  def test_we_can_use_else
+    result = case [true, false]
+    in [a, b] if a == b
+      :match
+    else
+     :no_match
+    end
+
+    assert_equal __, result
+  end
+
+  # ------------------------------------------------------------------
+
+  def value_pattern(variable)
+    case variable
+    in 0
+      :match_exact_value
+    in 1..10
+      :match_in_range
+    in Integer
+      :match_with_class
+    else
+      :no_match
+    end
+  end
+
+  def test_value_pattern
+    assert_equal __, value_pattern(0)
+    assert_equal __, value_pattern(5)
+    assert_equal __, value_pattern(100)
+    assert_equal __, value_pattern('Not a Number!')
+  end
+
+  # ------------------------------------------------------------------
+  # This pattern will bind variable to the value
+
+  def variable_pattern_with_binding(variable)
+    case 0
+    in variable
+      variable
+    else
+      :no_match
+    end
+  end
+
+  def test_variable_pattern_with_binding
+    assert_equal __, variable_pattern_with_binding(1)
+  end
+
+  # ------------------------------------------------------------------
+
+  # We can pin the value of the variable with ^
+
+  def variable_pattern_with_pin(variable)
+    case 0
+    in ^variable
+      variable
+    else
+      :no_match
+    end
+  end
+
+  def test_variable_pattern_with_pin
+    assert_equal __, variable_pattern_with_pin(1)
+  end
+
+  # ------------------------------------------------------------------
+
+  # We can drop values from pattern
+
+  def pattern_with_dropping(variable)
+    case variable
+    in [_, 2]
+      :match
+    else
+      :no_match
+    end
+  end
+
+  def test_pattern_with_dropping
+    assert_equal __, pattern_with_dropping(['I will not be checked', 2])
+    assert_equal __, pattern_with_dropping(['I will not be checked', 'But I will!'])
+  end
+
+  # ------------------------------------------------------------------
+
+  # We can use logical *or* in patterns
+
+  def alternative_pattern(variable)
+    case variable
+    in 0 | false | nil
+      :match
+    else
+      :no_match
+    end
+  end
+
+  def test_alternative_pattern
+    assert_equal __, alternative_pattern(0)
+    assert_equal __, alternative_pattern(false)
+    assert_equal __, alternative_pattern(nil)
+    assert_equal __, alternative_pattern(4)
+  end
+
+  # ------------------------------------------------------------------
+
+  # As pattern binds the variable to the value if pattern matches
+  # pat: pat => var
+
+  def as_pattern
+    a = 'First I was afraid'
+
+    case 'I was petrified'
+    in String => a
+      a
+    else
+      :no_match
+    end
+  end
+
+  def test_as_pattern
+    assert_equal __, as_pattern
+  end
+
+  # ------------------------------------------------------------------
+
+  # Array pattern works with all objects that have #deconstruct method that returns Array
+  # It is useful to cut needed parts from Array-ish objects
+
+  class Deconstructible
+    def initialize(str)
+      @data = str
+    end
+
+    def deconstruct
+      @data&.split('')
+    end
+  end
+
+  def array_pattern(deconstructible)
+    case deconstructible
+    in 'a', *res, 'd'
+      res
+    else
+      :no_match
+    end
+  end
+
+  def test_array_pattern
+    assert_equal __, array_pattern(Deconstructible.new('abcd'))
+    assert_equal __, array_pattern(Deconstructible.new('123'))
+  end
+
+  # ------------------------------------------------------------------
+
+  # Hash pattern is quite the same as Array pattern, but it expects #deconstruct_keys(keys) method
+  # It works with symbol keys for now
+
+  class LetterAccountant
+    def initialize(str)
+      @data = str
+    end
+
+    def deconstruct_keys(keys)
+      # we will count number of occurrences of each key in our data
+      keys.map { |key| [key, @data.count(key.to_s)] }.to_h
+    end
+  end
+
+  def hash_pattern(deconstructible_as_hash)
+    case deconstructible_as_hash
+    in {a: a, b: b}
+      [a, b]
+    else
+      :no_match
+    end
+  end
+
+  def test_hash_pattern
+    assert_equal __, hash_pattern(LetterAccountant.new('aaabbc'))
+    assert_equal __, hash_pattern(LetterAccountant.new('xyz'))
+  end
+
+  # we can write it even shorter
+  def hash_pattern_with_sugar(deconstructible_as_hash)
+    case deconstructible_as_hash
+    in a:, b:
+      [a, b]
+    else
+      :no_match
+    end
+  end
+
+  def test_hash_pattern_with_sugar
+    assert_equal __, hash_pattern_with_sugar(LetterAccountant.new('aaabbc'))
+    assert_equal __, hash_pattern_with_sugar(LetterAccountant.new('xyz'))
+  end
+
+end

src/about_proxy_object_project.rb

@@ -1,4 +1,4 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # Project: Create a Proxy Class
 #
@@ -42,7 +42,7 @@ end
 
 # The proxy object should pass the following Koan:
 #
-class AboutProxyObjectProject < EdgeCase::Koan
+class AboutProxyObjectProject < Neo::Koan
   def test_proxy_method_returns_wrapped_object
     # NOTE: The Television class is defined below
     tv = Proxy.new(Television.new)
@@ -135,7 +135,7 @@ class Television
 end
 
 # Tests for the Television class.  All of theses tests should pass.
-class TelevisionTest < EdgeCase::Koan
+class TelevisionTest < Neo::Koan
   def test_it_turns_on
     tv = Television.new
 

src/about_regular_expressions.rb

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutRegularExpressions < EdgeCase::Koan
+class AboutRegularExpressions < Neo::Koan
   def test_a_pattern_is_a_regular_expression
     assert_equal __(Regexp), /pattern/.class
   end

src/about_sandwich_code.rb

@@ -1,11 +1,11 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutSandwichCode < EdgeCase::Koan
+class AboutSandwichCode < Neo::Koan
 
   def count_lines(file_name)
     file = open(file_name)
     count = 0
-    while line = file.gets
+    while file.gets
       count += 1
     end
     count
@@ -66,7 +66,7 @@ class AboutSandwichCode < EdgeCase::Koan
   def count_lines2(file_name)
     file_sandwich(file_name) do |file|
       count = 0
-      while line = file.gets
+      while file.gets
         count += 1
       end
       count
@@ -99,7 +99,7 @@ class AboutSandwichCode < EdgeCase::Koan
   def count_lines3(file_name)
     open(file_name) do |file|
       count = 0
-      while line = file.gets
+      while file.gets
         count += 1
       end
       count

src/about_scope.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutScope < EdgeCase::Koan
+class AboutScope < Neo::Koan
   module Jims
     class Dog
       def identify
@@ -19,7 +19,7 @@ class AboutScope < EdgeCase::Koan
 
   def test_dog_is_not_available_in_the_current_scope
     assert_raise(___(NameError)) do
-      fido = Dog.new
+      Dog.new
     end
   end
 

src/about_scoring_project.rb

@@ -1,4 +1,4 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # Greed is a dice game where you roll up to five dice to accumulate
 # points.  The following "score" function will be used to calculate the
@@ -54,7 +54,7 @@ def score(dice)
   #++
 end
 
-class AboutScoringProject < EdgeCase::Koan
+class AboutScoringProject < Neo::Koan
   def test_score_of_an_empty_list_is_zero
     assert_equal 0, score([])
   end
@@ -90,6 +90,9 @@ class AboutScoringProject < EdgeCase::Koan
   def test_score_of_mixed_is_sum
     assert_equal 250, score([2,5,2,2,3])
     assert_equal 550, score([5,5,5,5])
+    assert_equal 1100, score([1,1,1,1])
+    assert_equal 1200, score([1,1,1,1,1])
+    assert_equal 1150, score([1,1,1,5,1])
   end
 
 end

src/about_strings.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutStrings < EdgeCase::Koan
+class AboutStrings < Neo::Koan
   def test_double_quoted_strings_are_strings
     string = "Hello, World"
     assert_equal __(true), string.is_a?(String)
@@ -42,6 +42,7 @@ It was the worst of times.
 }
     assert_equal __(54), long_string.length
     assert_equal __(3), long_string.lines.count
+    assert_equal __("\n"), long_string[0,1]
   end
 
   def test_here_documents_can_also_handle_multiple_lines
@@ -51,6 +52,7 @@ It was the worst of times.
 EOS
     assert_equal __(53), long_string.length
     assert_equal __(2), long_string.lines.count
+    assert_equal __("I"), long_string[0,1]
   end
 
   def test_plus_will_concatenate_two_strings
@@ -149,7 +151,7 @@ EOS
   end
 
   in_ruby_version("1.8") do
-    def test_in_ruby_1_8_single_characters_are_represented_by_integers
+    def test_in_older_ruby_single_characters_are_represented_by_integers
       assert_equal __(97, 'a'), ?a
       assert_equal __(true, false), ?a == 97
 
@@ -157,8 +159,8 @@ EOS
     end
   end
 
-  in_ruby_version("1.9") do
-    def test_in_ruby_1_9_single_characters_are_represented_by_strings
+  in_ruby_version("1.9", "2", "3") do
+    def test_in_modern_ruby_single_characters_are_represented_by_strings
       assert_equal __('a'), ?a
       assert_equal __(false), ?a == 97
     end

src/about_symbols.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutSymbols < EdgeCase::Koan
+class AboutSymbols < Neo::Koan
   def test_symbols_are_symbols
     symbol = :ruby
     assert_equal __(true), symbol.is_a?(Symbol)
@@ -36,9 +36,9 @@ class AboutSymbols < EdgeCase::Koan
   in_ruby_version("mri") do
     RubyConstant = "What is the sound of one hand clapping?"
     def test_constants_become_symbols
-      all_symbols = Symbol.all_symbols
+      all_symbols_as_strings = Symbol.all_symbols.map { |x| x.to_s }
 
-      assert_equal __(true), all_symbols.include?(__(:RubyConstant))
+      assert_equal __(true), all_symbols_as_strings.include?(__("RubyConstant"))
     end
   end
 
@@ -50,14 +50,14 @@ class AboutSymbols < EdgeCase::Koan
   def test_symbols_with_spaces_can_be_built
     symbol = :"cats and dogs"
 
-    assert_equal symbol, __("cats and dogs").to_sym
+    assert_equal __("cats and dogs").to_sym, symbol
   end
 
   def test_symbols_with_interpolation_can_be_built
     value = "and"
     symbol = :"cats #{value} dogs"
 
-    assert_equal symbol, __("cats and dogs").to_sym
+    assert_equal __("cats and dogs").to_sym, symbol
   end
 
   def test_to_s_is_called_on_interpolated_symbols

src/about_to_str.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutToStr < EdgeCase::Koan
+class AboutToStr < Neo::Koan
 
   class CanNotBeTreatedAsString
     def to_s

src/about_triangle_project.rb

@@ -1,9 +1,9 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # You need to write the triangle method in the file 'triangle.rb'
-require 'triangle.rb'
+require './triangle'
 
-class AboutTriangleProject < EdgeCase::Koan
+class AboutTriangleProject < Neo::Koan
   def test_equilateral_triangles_have_equal_sides
     assert_equal :equilateral, triangle(2, 2, 2)
     assert_equal :equilateral, triangle(10, 10, 10)
@@ -22,4 +22,3 @@ class AboutTriangleProject < EdgeCase::Koan
     assert_equal :scalene, triangle(5, 4, 2)
   end
 end
-

src/about_triangle_project_2.rb

@@ -1,9 +1,9 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
 # You need to write the triangle method in the file 'triangle.rb'
-require 'triangle.rb'
+require './triangle.rb'
 
-class AboutTriangleProject2 < EdgeCase::Koan
+class AboutTriangleProject2 < Neo::Koan
   # The first assignment did not talk about how to handle errors.
   # Let's handle that part now.
   def test_illegal_triangles_throw_exceptions
@@ -12,6 +12,5 @@ class AboutTriangleProject2 < EdgeCase::Koan
     assert_raise(TriangleError) do triangle(1, 1, 3) end
     assert_raise(TriangleError) do triangle(2, 4, 2) end
     # HINT: for tips, see http://stackoverflow.com/questions/3834203/ruby-koan-151-raising-exceptions
- end
+  end
 end
-

src/about_true_and_false.rb

@@ -1,6 +1,6 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+require File.expand_path(File.dirname(__FILE__) + '/neo')
 
-class AboutTrueAndFalse < EdgeCase::Koan
+class AboutTrueAndFalse < Neo::Koan
   def truth_value(condition)
     if condition
       :true_stuff

src/array_test.rb

@@ -1,47 +0,0 @@
-require 'test_helper'
-
-class ArrayTest < EdgeCase::TestCase
-
-  def test_basic_arrays
-    food = [:peanut, :button, :and, :jelly]
-    assert_equal __, food[0]
-    assert_equal __, food.size
-  end
-
-  def test_array_access
-    food = [:peanut, :button, :and, :jelly]
-    assert_equal __, food.first
-    assert_equal __, food.last
-    assert_equal __, food[0]
-    assert_equal __, food[2]
-    assert_equal __, food[(food.size() - 1)]
-  end
-
-  def test_arrays_with_other_objects
-    food = [:peanut, :button, :and, :jelly, 1, nil]
-    assert_equal __, food.size
-    assert_equal __, food.last
-    assert_equal __, food[5]
-  end
-
-  def test_adding_to_an_array_with_shovel_shovel
-    food = [:peanut, :button, :and, :jelly]
-    food << 'sandwich'
-    assert_equal __, food.size
-    assert_equal __, food.first
-  end
-
-  def test_adding_to_an_array_with_push
-    food = [:peanut, :button, :and, :jelly]
-    food.push('sandwich')
-    assert_equal __, food.last
-  end
-
-  def test_adding_to_an_array_with_unshift
-    food = [:peanut, :button, :and, :jelly]
-    food.unshift('a')
-    assert_equal __, food.first
-  end
-
-end
-

src/autotest/discover.rb

@@ -1,3 +0,0 @@
-Autotest.add_discovery do
-  "rubykoan" if File.exist? 'path_to_enlightenment.rb'
-end

src/autotest/rubykoan.rb

@@ -1,24 +0,0 @@
-require 'autotest'
-
-class Autotest::Rubykoan < Autotest
-  def initialize
-    super
-    @exceptions = /\.txt|Rakefile|\.rdoc/
-
-    self.order = :alpha
-    self.add_mapping(/^about_.*rb$/) do |filename, _|
-      filename
-    end 
-
-  end
-
-  def make_test_cmd files_to_test
-    "#{ruby}  'path_to_enlightenment.rb'"
-  end 
-
-  # quiet test/unit chatter
-  def handle_results(results)
-  end
-
-end
-

src/code_mash.rb

@@ -1 +0,0 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')

src/first_test.rb

@@ -1,11 +0,0 @@
-require 'test/unit'
-
-class TestSomething < Test::Unit::TestCase
-  def test_assert
-    assert true
-    assert_equal 1, 1
-    assert_equal 1, 1.0
-  end
-end
-
-

src/koans.watchr

@@ -0,0 +1,3 @@
+watch( '.*\.rb' ) do
+  system 'rake'
+end

src/neo.rb

@@ -1,7 +1,8 @@
 #!/usr/bin/env ruby
 # -*- ruby -*-
 
-require 'test/unit/assertions'
+$VERBOSE = nil
+
 begin
   require 'win32console'
 rescue LoadError
@@ -24,6 +25,10 @@ def in_ruby_version(*versions)
   yield if versions.any? { |v| ruby_version?(v) }
 end
 
+def before_ruby_version(version)
+  Gem::Version.new(RUBY_VERSION) < Gem::Version.new(version)
+end
+
 in_ruby_version("1.8") do
   class KeyError < StandardError
   end
@@ -65,7 +70,7 @@ class Object
     end
   end
 
-  in_ruby_version("1.9") do
+  in_ruby_version("1.9", "2", "3") do
     public :method_missing
   end
 end
@@ -83,7 +88,7 @@ class String
   end
 end
 
-module EdgeCase
+module Neo
   class << self
     def simple_output
       ENV['SIMPLE_KOAN_OUTPUT'] == 'true'
@@ -122,6 +127,8 @@ module EdgeCase
       if ENV['ANSI_COLOR'].nil?
         if using_windows?
           using_win32console
+        else
+          return true
         end
       else
         ENV['ANSI_COLOR'] =~ /^(t|y)/i
@@ -137,20 +144,68 @@ module EdgeCase
     end
   end
 
+  module Assertions
+    FailedAssertionError = Class.new(StandardError)
+
+    def flunk(msg)
+      raise FailedAssertionError, msg
+    end
+
+    def assert(condition, msg=nil)
+      msg ||= "Failed assertion."
+      flunk(msg) unless condition
+      true
+    end
+
+    def assert_equal(expected, actual, msg=nil)
+      msg ||= "Expected #{expected.inspect} to equal #{actual.inspect}"
+      assert(expected == actual, msg)
+    end
+
+    def assert_not_equal(expected, actual, msg=nil)
+      msg ||= "Expected #{expected.inspect} to not equal #{actual.inspect}"
+      assert(expected != actual, msg)
+    end
+
+    def assert_nil(actual, msg=nil)
+      msg ||= "Expected #{actual.inspect} to be nil"
+      assert(nil == actual, msg)
+    end
+
+    def assert_not_nil(actual, msg=nil)
+      msg ||= "Expected #{actual.inspect} to not be nil"
+      assert(nil != actual, msg)
+    end
+
+    def assert_match(pattern, actual, msg=nil)
+      msg ||= "Expected #{actual.inspect} to match #{pattern.inspect}"
+      assert pattern =~ actual, msg
+    end
+
+    def assert_raise(exception)
+      begin
+        yield
+      rescue Exception => ex
+        expected = ex.is_a?(exception)
+        assert(expected, "Exception #{exception.inspect} expected, but #{ex.inspect} was raised")
+        return ex
+      end
+      flunk "Exception #{exception.inspect} expected, but nothing raised"
+    end
+
+    def assert_nothing_raised
+      begin
+        yield
+      rescue Exception => ex
+        flunk "Expected nothing to be raised, but exception #{exception.inspect} was raised"
+      end
+    end
+  end
+
   class Sensei
     attr_reader :failure, :failed_test, :pass_count
 
-    in_ruby_version("1.8") do
-      AssertionError = Test::Unit::AssertionFailedError
-    end
-
-    in_ruby_version("1.9") do
-      if defined?(MiniTest)
-        AssertionError = MiniTest::Assertion
-      else
-        AssertionError = Test::Unit::AssertionFailedError
-      end
-    end
+    FailedAssertionError = Assertions::FailedAssertionError
 
     def initialize
       @pass_count = 0
@@ -163,7 +218,7 @@ module EdgeCase
 
     def add_progress(prog)
       @_contents = nil
-      exists = File.exists?(PROGRESS_FILE_NAME)
+      exists = File.exist?(PROGRESS_FILE_NAME)
       File.open(PROGRESS_FILE_NAME,'a+') do |f|
         f.print "#{',' if exists}#{prog}"
       end
@@ -171,7 +226,7 @@ module EdgeCase
 
     def progress
       if @_contents.nil?
-        if File.exists?(PROGRESS_FILE_NAME)
+        if File.exist?(PROGRESS_FILE_NAME)
           File.open(PROGRESS_FILE_NAME,'r') do |f|
             @_contents = f.read.to_s.gsub(/\s/,'').split(',')
           end
@@ -193,7 +248,7 @@ module EdgeCase
         @failure = step.failure
         add_progress(@pass_count)
         @observations << Color.red("#{step.koan_file}##{step.name} has damaged your karma.")
-        throw :edgecase_exit
+        throw :neo_exit
       end
     end
 
@@ -202,7 +257,7 @@ module EdgeCase
     end
 
     def assert_failed?
-      failure.is_a?(AssertionError)
+      failure.is_a?(FailedAssertionError)
     end
 
     def instruct
@@ -219,7 +274,7 @@ module EdgeCase
 
     def show_progress
       bar_width = 50
-      total_tests = EdgeCase::Koan.total_tests
+      total_tests = Neo::Koan.total_tests
       scale = bar_width.to_f/total_tests
       print Color.green("your path thus far [")
       happy_steps = (pass_count*scale).to_i
@@ -230,12 +285,12 @@ module EdgeCase
         print Color.cyan('_'*(bar_width-1-happy_steps))
       end
       print Color.green(']')
-      print " #{pass_count}/#{total_tests}"
+      print " #{pass_count}/#{total_tests} (#{pass_count*100/total_tests}%)"
       puts
     end
 
     def end_screen
-      if EdgeCase.simple_output
+      if Neo.simple_output
         boring_end_screen
       else
         artistic_end_screen
@@ -266,13 +321,13 @@ module EdgeCase
  ,:::::::::::,                                                    ::::::::::::,
  :::::::::::,                                                     ,::::::::::::
 :::::::::::::                                                     ,::::::::::::
-::::::::::::                      Ruby Koans                       ::::::::::::,
-::::::::::::#{                  ruby_version                     },::::::::::::,
-:::::::::::,                                                      , ::::::::::::
-,:::::::::::::,                brought to you by                 ,,::::::::::::,
+::::::::::::                      Ruby Koans                       ::::::::::::
+::::::::::::#{                  ruby_version                     },::::::::::::
+:::::::::::,                                                      , :::::::::::
+,:::::::::::::,                brought to you by                 ,,::::::::::::
 ::::::::::::::                                                    ,::::::::::::
  ::::::::::::::,                                                 ,:::::::::::::
- ::::::::::::,             EdgeCase Software Artisans           , ::::::::::::
+ ::::::::::::,               Neo Software Artisans              , ::::::::::::
   :,::::::::: ::::                                               :::::::::::::
    ,:::::::::::  ,:                                          ,,:::::::::::::,
      ::::::::::::                                           ,::::::::::::::,
@@ -307,11 +362,7 @@ ENDTEXT
       puts Color.red(indent(failure.message).join)
       puts
       puts "Please meditate on the following code:"
-      if assert_failed?
-        puts embolden_first_line_only(indent(find_interesting_lines(failure.backtrace)))
-      else
-        puts embolden_first_line_only(indent(failure.backtrace))
-      end
+      puts embolden_first_line_only(indent(find_interesting_lines(failure.backtrace)))
       puts
     end
 
@@ -334,7 +385,7 @@ ENDTEXT
 
     def find_interesting_lines(backtrace)
       backtrace.reject { |line|
-        line =~ /test\/unit\/|edgecase\.rb|minitest/
+        line =~ /neo\.rb/
       }
     end
 
@@ -364,7 +415,7 @@ ENDTEXT
   end
 
   class Koan
-    include Test::Unit::Assertions
+    include Assertions
 
     attr_reader :name, :failure, :koan_count, :step_count, :koan_file
 
@@ -394,19 +445,19 @@ ENDTEXT
       setup
       begin
         send(name)
-      rescue StandardError, EdgeCase::Sensei::AssertionError => ex
+      rescue StandardError, Neo::Sensei::FailedAssertionError => ex
         failed(ex)
       ensure
         begin
           teardown
-        rescue StandardError, EdgeCase::Sensei::AssertionError => ex
+        rescue StandardError, Neo::Sensei::FailedAssertionError => ex
           failed(ex) if passed?
         end
       end
       self
     end
 
-    # Class methods for the EdgeCase test suite.
+    # Class methods for the Neo test suite.
     class << self
       def inherited(subclass)
         subclasses << subclass
@@ -463,7 +514,7 @@ ENDTEXT
 
   class ThePath
     def walk
-      sensei = EdgeCase::Sensei.new
+      sensei = Neo::Sensei.new
       each_step do |step|
         sensei.observe(step.meditate)
       end
@@ -471,9 +522,9 @@ ENDTEXT
     end
 
     def each_step
-      catch(:edgecase_exit) {
+      catch(:neo_exit) {
         step_count = 0
-        EdgeCase::Koan.subclasses.each_with_index do |koan,koan_index|
+        Neo::Koan.subclasses.each_with_index do |koan,koan_index|
           koan.testmethods.each do |method_name|
             step = koan.new(method_name, koan.to_s, koan_index+1, step_count+=1)
             yield step
@@ -485,6 +536,6 @@ ENDTEXT
 end
 
 END {
-  EdgeCase::Koan.command_line(ARGV)
-  EdgeCase::ThePath.new.walk
+  Neo::Koan.command_line(ARGV)
+  Neo::ThePath.new.walk
 }

src/path_to_enlightenment.rb

@@ -3,18 +3,21 @@
 $LOAD_PATH << File.dirname(__FILE__)
 
 require 'about_asserts'
-require 'about_nil'
-require 'about_objects'
-require 'about_arrays'
-require 'about_array_assignment'
-require 'about_hashes'
+require 'about_true_and_false'
 require 'about_strings'
 require 'about_symbols'
-require 'about_regular_expressions'
+require 'about_arrays'
+require 'about_array_assignment'
+require 'about_objects'
+require 'about_nil'
+require 'about_hashes'
 require 'about_methods'
+in_ruby_version("2", "3") do
+  require 'about_keyword_arguments'
+end
 require 'about_constants'
+require 'about_regular_expressions'
 require 'about_control_statements'
-require 'about_true_and_false'
 require 'about_triangle_project'
 require 'about_exceptions'
 require 'about_triangle_project_2'
@@ -35,4 +38,7 @@ require 'about_to_str'
 in_ruby_version("jruby") do
   require 'about_java_interop'
 end
+in_ruby_version("2.7", "3") do
+  require 'about_pattern_matching'
+end
 require 'about_extra_credit'

src/test_helper.rb

@@ -1,7 +0,0 @@
-require 'test/unit'
-
-def __
-  "FILL ME IN"
-end
-
-EdgeCase = Test::Unit

tests/check_test.rb

@@ -0,0 +1,26 @@
+require_relative "test_helper"
+
+class CheckTest < Minitest::Test
+  def with_captured_stdout
+    original_stdout = $stdout
+    $stdout = StringIO.new
+    yield
+    $stdout.string
+  ensure
+    $stdout = original_stdout
+  end
+
+  def test_check_asserts
+    output = with_captured_stdout do
+      Rake::Task['check:asserts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+
+  def test_check_abouts
+    output = with_captured_stdout do
+      Rake::Task['check:abouts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+end

tests/test_helper.rb

@@ -0,0 +1,4 @@
+require "minitest/autorun"
+require "rake"
+
+Rake.application.load_rakefile