java coercion

koans/about_java_interop.rb

@@ -95,6 +95,21 @@ class AboutJavaInterop < EdgeCase::Koan
     assert_equal __, java_array.toString.is_a?(java.lang.String)
   end
 
+  def test_some_ruby_objects_can_be_coerced_to_java
+    assert_equal __, "ruby string".to_java.class
+    assert_equal __, 1.to_java.class
+    assert_equal __, 9.32.to_java.class
+    assert_equal __, false.to_java.class
+  end
+
+  def test_some_ruby_objects_can_NOT_be_coerced_to_java
+    [[], {}, Object.new].each do |ruby_object|
+      assert_raise(___) do
+        ruby_object.to_java_class
+      end
+    end
+  end
+
   def test_java_collections_are_enumerable
     java_array = java.util.ArrayList.new
     java_array << "one" << "two" << "three"

koans/about_sensei.rb

@@ -1,118 +0,0 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
-
-class Sensei
-  def observe(step)
-    # Step Protocol: step.passed? | step.failure | step.koan_file | step.name
-    # WRITE THIS CODE
-  end
-
-  def pass_count
-    # WRITE THIS CODE
-  end
-
-  def failed?
-    # WRITE THIS CODE
-  end
-
-  def instruct
-    # WRITE THIS CODE
-  end
-end
-
-def student_passes_test
-  assert true  # DO NOT CHANGE YOUR STUDENT'S ANSWER
-end
-
-def student_fails_test
-  assert false # DO NOT CHANGE YOUR STUDENT'S ANSWER
-end
-
-class AboutSensei < EdgeCase::Koan
-  def test_sensei_comments_about_expanded_awareness
-    you = Sensei.new
-    student_step = EdgeCase::Koan.new(:student_passes_test, self)
-    student_meditation = student_step.meditate
-    observation = you.observe(student_meditation)
-    assert_equal "AboutSensei#student_passes_test has expanded your awareness.", observation
-  end
-
-  def test_sensei_comments_about_damaged_karma
-    you = Sensei.new
-    student_step = EdgeCase::Koan.new(:student_fails_test, self)
-    student_meditation = student_step.meditate
-    observation = you.observe(student_meditation)
-    assert_equal "AboutSensei#student_fails_test has damaged your karma.", observation
-  end
-
-  def test_sensei_counts_passed_steps
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    assert_equal 4, you.pass_count
-  end
-
-  def test_sensei_reports_failed_true
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step
-    end
-    assert you.failed?
-  end
-
-  def test_sensei_reports_failed_true
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self)]
-    student_steps.each do |step|
-      you.observe step
-    end
-    assert ! you.failed?
-  end
-
-  def test_sensei_shows_beginning_progress
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    instructions = you.instruct
-    assert_match "You have not yet reached enlightenment", instructions
-    assert_match "You have passed 0 steps", instructions
-  end
-
-  def test_sensei_shows_partial_progress
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    instructions = you.instruct
-    assert_match "You have not yet reached enlightenment", instructions
-    assert_match "You have passed 3 steps", instructions
-  end
-
-  def test_sensei_congratulates_student
-    you = Sensei.new
-    # run all of Ruby Koans with you as the sensei
-    EdgeCase::ThePath.new(you).walk
-
-    instructions = you.instruct
-    assert_match "The student has become the master", instructions
-  end
-end

koans/edgecase.rb

@@ -124,10 +124,7 @@ module EdgeCase
       @pass_count = 0
       @failure = nil
       @failed_test = nil
-    end
+      @observations = []
-
-    def observations
-      @observations ||= []
     end
 
     PROGRESS_FILE_NAME = '.path_progress'
@@ -157,13 +154,13 @@ module EdgeCase
       if step.passed?
         @pass_count += 1
         if @pass_count > progress.last.to_i
-          observations << Color.green("#{step.koan_file}##{step.name} has expanded your awareness.")
+          @observations << Color.green("#{step.koan_file}##{step.name} has expanded your awareness.")
         end
       else
         @failed_test = step
         @failure = step.failure
         add_progress(@pass_count)
-        observations << Color.red("#{step.koan_file}##{step.name} has damaged your karma.")
+        @observations << Color.red("#{step.koan_file}##{step.name} has damaged your karma.")
         throw :edgecase_exit
       end
     end
@@ -178,7 +175,7 @@ module EdgeCase
 
     def instruct
       if failed?
-        observations.each{|c| puts c }
+        @observations.each{|c| puts c }
         encourage
         guide_through_error
         a_zenlike_statement
@@ -206,23 +203,22 @@ module EdgeCase
     end
 
     def end_screen
-      screen = if EdgeCase.simple_output
+      if EdgeCase.simple_output
-        end_message
+        boring_end_screen
       else
         artistic_end_screen
       end
-      puts screen
     end
 
-    def end_message
+    def boring_end_screen
-      "The student has become the master"
+      puts "Mountains are again merely mountains"
     end
 
     def artistic_end_screen
       "JRuby 1.9.x Koans"
       ruby_version = "(in #{'J' if defined?(JRUBY_VERSION)}Ruby #{defined?(JRUBY_VERSION) ? JRUBY_VERSION : RUBY_VERSION})"
       ruby_version = ruby_version.side_padding(54)
-      return <<-ENDTEXT
+        completed = <<-ENDTEXT
                                   ,,   ,  ,,
                                 :      ::::,    :::,
                    ,        ,,: :::::::::::::,,  ::::   :  ,
@@ -233,7 +229,7 @@ module EdgeCase
       ,:     , ,:,,:                                       :::::::::::::
      ::,:   ,,:::,                                           ,::::::::::::,
     ,:::, :,,:::                                               ::::::::::::,
-   ,::: :::::::,#{        end_message.side_padding 48          },::::::::::::
+   ,::: :::::::,       Mountains are again merely mountains     ,::::::::::::
    :::,,,::::::                                                   ::::::::::::
  ,:::::::::::,                                                    ::::::::::::,
  :::::::::::,                                                     ,::::::::::::
@@ -257,6 +253,7 @@ module EdgeCase
                       ,::::                         , ,,
                                                   ,,,
 ENDTEXT
+        puts completed
     end
 
     def encourage
@@ -433,28 +430,23 @@ ENDTEXT
   end
 
   class ThePath
-    def initialize(sensei=nil)
-      @sensei = sensei || Sensei.new
-    end
-
     def walk
+      sensei = EdgeCase::Sensei.new
       each_step do |step|
-        @sensei.observe(step.meditate)
+        sensei.observe(step.meditate)
       end
-      @sensei.instruct
+      sensei.instruct
     end
 
     def each_step
       catch(:edgecase_exit) {
         step_count = 0
         EdgeCase::Koan.subclasses.each_with_index do |koan,koan_index|
-          if @sensei.instance_of?(EdgeCase::Sensei) || (koan.to_s != "AboutSensei")
           koan.testmethods.each do |method_name|
             step = koan.new(method_name, koan.to_s, koan_index+1, step_count+=1)
             yield step
           end
         end
-        end
       }
     end
   end

koans/path_to_enlightenment.rb

@@ -35,4 +35,3 @@ in_ruby_version("jruby") do
   require 'about_java_interop'
 end
 require 'about_extra_credit'
-require 'about_sensei'

src/about_java_interop.rb

@@ -95,6 +95,21 @@ class AboutJavaInterop < EdgeCase::Koan
     assert_equal __(false), java_array.toString.is_a?(java.lang.String)
   end
 
+  def test_some_ruby_objects_can_be_coerced_to_java
+    assert_equal __(Java::JavaLang::String), "ruby string".to_java.class
+    assert_equal __(Java::JavaLang::Long), 1.to_java.class
+    assert_equal __(Java::JavaLang::Double), 9.32.to_java.class
+    assert_equal __(Java::JavaLang::Boolean), false.to_java.class
+  end
+
+  def test_some_ruby_objects_can_NOT_be_coerced_to_java
+    [[], {}, Object.new].each do |ruby_object|
+      assert_raise(___(NoMethodError)) do
+        ruby_object.to_java_class
+      end
+    end
+  end
+
   def test_java_collections_are_enumerable
     java_array = java.util.ArrayList.new
     java_array << "one" << "two" << "three"

src/about_sensei.rb

@@ -1,141 +0,0 @@
-require File.expand_path(File.dirname(__FILE__) + '/edgecase')
-
-class Sensei
-  def observe(step)
-    # Step Protocol: step.passed? | step.failure | step.koan_file | step.name
-    # WRITE THIS CODE
-    #--
-    @pass_count ||= 0
-    if step.passed?
-      @pass_count += 1 
-      "#{step.koan_file.class.to_s}##{step.name} has expanded your awareness."
-    else
-      @failure = step.failure
-      "#{step.koan_file.class.to_s}##{step.name} has damaged your karma."
-    end
-    #++
-  end
-
-  def pass_count
-    # WRITE THIS CODE
-    #--
-    @pass_count
-    #++
-  end
-
-  def failed?
-    # WRITE THIS CODE
-    #--
-    ! @failure.nil?
-    #++
-  end
-
-  def instruct
-    # WRITE THIS CODE
-    #--
-      if failed?
-        "You have not yet reached enlightenment. You have passed #{pass_count} steps."
-      else
-        "The student has become the master"
-      end
-    #++
-  end
-end
-
-def student_passes_test
-  assert true  # DO NOT CHANGE YOUR STUDENT'S ANSWER
-end
-
-def student_fails_test
-  assert false # DO NOT CHANGE YOUR STUDENT'S ANSWER
-end
-
-class AboutSensei < EdgeCase::Koan
-  def test_sensei_comments_about_expanded_awareness
-    you = Sensei.new
-    student_step = EdgeCase::Koan.new(:student_passes_test, self)
-    student_meditation = student_step.meditate
-    observation = you.observe(student_meditation)
-    assert_equal "AboutSensei#student_passes_test has expanded your awareness.", observation
-  end
-
-  def test_sensei_comments_about_damaged_karma
-    you = Sensei.new
-    student_step = EdgeCase::Koan.new(:student_fails_test, self)
-    student_meditation = student_step.meditate
-    observation = you.observe(student_meditation)
-    assert_equal "AboutSensei#student_fails_test has damaged your karma.", observation
-  end
-
-  def test_sensei_counts_passed_steps
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    assert_equal 4, you.pass_count
-  end
-
-  def test_sensei_reports_failed_true
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step
-    end
-    assert you.failed?
-  end
-
-  def test_sensei_reports_failed_true
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self)]
-    student_steps.each do |step|
-      you.observe step
-    end
-    assert ! you.failed?
-  end
-
-  def test_sensei_shows_beginning_progress
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    instructions = you.instruct
-    assert_match "You have not yet reached enlightenment", instructions
-    assert_match "You have passed 0 steps", instructions
-  end
-
-  def test_sensei_shows_partial_progress
-    you = Sensei.new
-    student_steps = [EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_passes_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self),
-                     EdgeCase::Koan.new(:student_fails_test, self)]
-    student_steps.each do |step|
-      you.observe step.meditate
-    end
-    instructions = you.instruct
-    assert_match "You have not yet reached enlightenment", instructions
-    assert_match "You have passed 3 steps", instructions
-  end
-
-  def test_sensei_congratulates_student
-    you = Sensei.new
-    # run all of Ruby Koans with you as the sensei
-    EdgeCase::ThePath.new(you).walk
-
-    instructions = you.instruct
-    assert_match "The student has become the master", instructions
-  end
-end

src/edgecase.rb

@@ -124,10 +124,7 @@ module EdgeCase
       @pass_count = 0
       @failure = nil
       @failed_test = nil
-    end
+      @observations = []
-
-    def observations
-      @observations ||= []
     end
 
     PROGRESS_FILE_NAME = '.path_progress'
@@ -157,13 +154,13 @@ module EdgeCase
       if step.passed?
         @pass_count += 1
         if @pass_count > progress.last.to_i
-          observations << Color.green("#{step.koan_file}##{step.name} has expanded your awareness.")
+          @observations << Color.green("#{step.koan_file}##{step.name} has expanded your awareness.")
         end
       else
         @failed_test = step
         @failure = step.failure
         add_progress(@pass_count)
-        observations << Color.red("#{step.koan_file}##{step.name} has damaged your karma.")
+        @observations << Color.red("#{step.koan_file}##{step.name} has damaged your karma.")
         throw :edgecase_exit
       end
     end
@@ -178,7 +175,7 @@ module EdgeCase
 
     def instruct
       if failed?
-        observations.each{|c| puts c }
+        @observations.each{|c| puts c }
         encourage
         guide_through_error
         a_zenlike_statement
@@ -206,23 +203,22 @@ module EdgeCase
     end
 
     def end_screen
-      screen = if EdgeCase.simple_output
+      if EdgeCase.simple_output
-        end_message
+        boring_end_screen
       else
         artistic_end_screen
       end
-      puts screen
     end
 
-    def end_message
+    def boring_end_screen
-      "The student has become the master"
+      puts "Mountains are again merely mountains"
     end
 
     def artistic_end_screen
       "JRuby 1.9.x Koans"
       ruby_version = "(in #{'J' if defined?(JRUBY_VERSION)}Ruby #{defined?(JRUBY_VERSION) ? JRUBY_VERSION : RUBY_VERSION})"
       ruby_version = ruby_version.side_padding(54)
-      return <<-ENDTEXT
+        completed = <<-ENDTEXT
                                   ,,   ,  ,,
                                 :      ::::,    :::,
                    ,        ,,: :::::::::::::,,  ::::   :  ,
@@ -233,7 +229,7 @@ module EdgeCase
       ,:     , ,:,,:                                       :::::::::::::
      ::,:   ,,:::,                                           ,::::::::::::,
     ,:::, :,,:::                                               ::::::::::::,
-   ,::: :::::::,#{        end_message.side_padding 48          },::::::::::::
+   ,::: :::::::,       Mountains are again merely mountains     ,::::::::::::
    :::,,,::::::                                                   ::::::::::::
  ,:::::::::::,                                                    ::::::::::::,
  :::::::::::,                                                     ,::::::::::::
@@ -257,6 +253,7 @@ module EdgeCase
                       ,::::                         , ,,
                                                   ,,,
 ENDTEXT
+        puts completed
     end
 
     def encourage
@@ -433,28 +430,23 @@ ENDTEXT
   end
 
   class ThePath
-    def initialize(sensei=nil)
-      @sensei = sensei || Sensei.new
-    end
-
     def walk
+      sensei = EdgeCase::Sensei.new
       each_step do |step|
-        @sensei.observe(step.meditate)
+        sensei.observe(step.meditate)
       end
-      @sensei.instruct
+      sensei.instruct
     end
 
     def each_step
       catch(:edgecase_exit) {
         step_count = 0
         EdgeCase::Koan.subclasses.each_with_index do |koan,koan_index|
-          if @sensei.instance_of?(EdgeCase::Sensei) || (koan.to_s != "AboutSensei")
           koan.testmethods.each do |method_name|
             step = koan.new(method_name, koan.to_s, koan_index+1, step_count+=1)
             yield step
           end
         end
-        end
       }
     end
   end

src/path_to_enlightenment.rb

@@ -35,4 +35,3 @@ in_ruby_version("jruby") do
   require 'about_java_interop'
 end
 require 'about_extra_credit'
-require 'about_sensei'