Merge pull request #591 from hilary/exercise_cases_helper_methods

generators: Exercise cases helper methods

    moved ExerciseCase under the Generator module (and gave thanks for sed)
    moved the assert helper methods out into their own module, for ease of testing and because ExerciseCase was becoming bloated.
    added test coverage for ExerciseCase

exercises/acronym/.meta/generator/acronym_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class AcronymCase < ExerciseCase
+class AcronymCase < Generator::ExerciseCase
 
   def workload
     assert_equal { "Acronym.abbreviate('#{phrase}')" }

exercises/all-your-base/.meta/generator/all_your_base_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class AllYourBaseCase < ExerciseCase
+class AllYourBaseCase < Generator::ExerciseCase
 
   def workload
     indent(4, (assignments + assertion).join("\n")) + "\n"

exercises/alphametics/.meta/generator/alphametics_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class AlphameticsCase < ExerciseCase
+class AlphameticsCase < Generator::ExerciseCase
   def workload
     body =
       "input = %s\n" % input,

exercises/anagram/.meta/generator/anagram_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class AnagramCase < ExerciseCase
+class AnagramCase < Generator::ExerciseCase
 
   def workload
     indent_lines([show_comment, detector, anagram, wanted, assert].compact)

exercises/beer-song/.meta/generator/beer_song_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class BeerSongCase < ExerciseCase
+class BeerSongCase < Generator::ExerciseCase
 
   def workload
     "assert_equal expected, #{beer_song}"

exercises/binary/.meta/generator/binary_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class BinaryCase < ExerciseCase
+class BinaryCase < Generator::ExerciseCase
 
   def workload
     raises_error? ? error_assertion : equality_assertion

exercises/bowling/.meta/generator/bowling_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class BowlingCase < ExerciseCase
+class BowlingCase < Generator::ExerciseCase
 
   def workload
     indent_lines(assert)

exercises/bracket-push/.meta/generator/bracket_push_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class BracketPushCase < ExerciseCase
+class BracketPushCase < Generator::ExerciseCase
 
   def workload
     long_input? ? split_test : simple_test

exercises/clock/.meta/generator/clock_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class ClockCase < ExerciseCase
+class ClockCase < Generator::ExerciseCase
   def name
     'test_%s' % description
                 .gsub(/[() -]/, '_')

exercises/connect/.meta/generator/connect_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class ConnectCase < ExerciseCase
+class ConnectCase < Generator::ExerciseCase
 
   def test_body
     [

exercises/custom-set/.meta/generator/custom_set_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class CustomSetCase < ExerciseCase
+class CustomSetCase < Generator::ExerciseCase
 
   def workload
     send property

exercises/difference-of-squares/.meta/generator/difference_of_squares_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class DifferenceOfSquaresCase < ExerciseCase
+class DifferenceOfSquaresCase < Generator::ExerciseCase
 
   def workload
     %Q(assert_equal #{expected_formatted}, Squares.new(#{number}).#{action})

exercises/dominoes/.meta/generator/dominoes_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class DominoesCase < ExerciseCase
+class DominoesCase < Generator::ExerciseCase
   def name
     'test_%s' % description.gsub("can't", 'can not').gsub(/[= -]+/, '_')
   end

exercises/etl/.meta/generator/etl_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class EtlCase < ExerciseCase
+class EtlCase < Generator::ExerciseCase
   def workload
     indent_lines([
       "old = {\n      #{format(input)}\n    }",

exercises/gigasecond/.meta/generator/gigasecond_cases.rb

@@ -1,7 +1,7 @@
 require 'generator/exercise_cases'
 require 'time'
 
-class GigasecondCase < ExerciseCase
+class GigasecondCase < Generator::ExerciseCase
   def workload
     %Q(assert_equal #{want}, Gigasecond.from(#{got}))
   end

exercises/grains/.meta/generator/grains_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class GrainsCase < ExerciseCase
+class GrainsCase < Generator::ExerciseCase
 
   def workload
     send("#{property}_workload")

exercises/hamming/.meta/generator/hamming_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class HammingCase < ExerciseCase
+class HammingCase < Generator::ExerciseCase
   def workload
     if raises_error?
       assert_raises(ArgumentError) { test_case }

exercises/hello-world/.meta/generator/hello_world_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class HelloWorldCase < ExerciseCase
+class HelloWorldCase < Generator::ExerciseCase
 
   def workload
     assert_equal { "HelloWorld.hello" }

exercises/isogram/.meta/generator/isogram_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class IsogramCase < ExerciseCase
+class IsogramCase < Generator::ExerciseCase
 
   def workload
     indent_lines(

exercises/largest-series-product/.meta/generator/largest_series_product_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class LargestSeriesProductCase < ExerciseCase
+class LargestSeriesProductCase < Generator::ExerciseCase
 
   def workload
     if raises_error?

exercises/leap/.meta/generator/leap_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class LeapCase < ExerciseCase
+class LeapCase < Generator::ExerciseCase
 
   def workload
     "#{assert} Year.leap?(#{input.inspect})"

exercises/luhn/.meta/generator/luhn_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class LuhnCase < ExerciseCase
+class LuhnCase < Generator::ExerciseCase
   def workload
     "#{assert} Luhn.valid?(#{input.inspect})"
   end

exercises/nth-prime/.meta/generator/nth_prime_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class NthPrimeCase < ExerciseCase
+class NthPrimeCase < Generator::ExerciseCase
 
   def workload
     if raises_error?

exercises/ocr-numbers/.meta/generator/ocr_numbers_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class OcrNumbersCase < ExerciseCase
+class OcrNumbersCase < Generator::ExerciseCase
   def workload
     if raises_error?
       assert_raises(ArgumentError) { test_case }

exercises/pangram/.meta/generator/pangram_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class PangramCase < ExerciseCase
+class PangramCase < Generator::ExerciseCase
   def workload
     [
     "phrase = '#{input}'",

exercises/pig-latin/.meta/generator/pig_latin_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class PigLatinCase < ExerciseCase
+class PigLatinCase < Generator::ExerciseCase
   def workload
     assert_equal { "PigLatin.translate(#{input.inspect})" }
   end

exercises/queen-attack/.meta/generator/queen_attack_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class QueenAttackCase < ExerciseCase
+class QueenAttackCase < Generator::ExerciseCase
 
   def workload
     property == 'create' ? create_workload : attack_workload

exercises/raindrops/.meta/generator/raindrops_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class RaindropsCase < ExerciseCase
+class RaindropsCase < Generator::ExerciseCase
 
   def workload
     assert_equal { "Raindrops.convert(#{number})" }

exercises/rna-transcription/.meta/generator/rna_transcription_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class RnaTranscriptionCase < ExerciseCase
+class RnaTranscriptionCase < Generator::ExerciseCase
 
   def workload
     "assert_equal '#{expected}', Complement.of_dna('#{dna}')"

exercises/roman-numerals/.meta/generator/roman_numerals_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class RomanNumeralsCase < ExerciseCase
+class RomanNumeralsCase < Generator::ExerciseCase
   def name
     'test_%s' % number.to_s
   end

exercises/run-length-encoding/.meta/generator/run_length_encoding_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class RunLengthEncodingCase < ExerciseCase
+class RunLengthEncodingCase < Generator::ExerciseCase
 
   def workload
     indent_lines([

exercises/say/.meta/generator/say_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class SayCase < ExerciseCase
+class SayCase < Generator::ExerciseCase
 
   def workload
     [

exercises/sieve/.meta/generator/sieve_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class SieveCase < ExerciseCase
+class SieveCase < Generator::ExerciseCase
   OPEN_ARRAY = "[\n\s\s\s\s\s\s".freeze
   CLOSE_ARRAY = "\n\s\s\s\s]".freeze
   NEW_ARRAY_ROW = ",\n\s\s\s\s\s\s".freeze

exercises/tournament/.meta/generator/tournament_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class TournamentCase < ExerciseCase
+class TournamentCase < Generator::ExerciseCase
 
   def workload
     'Tournament.tally(input)'

exercises/transpose/.meta/generator/transpose_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class TransposeCase < ExerciseCase
+class TransposeCase < Generator::ExerciseCase
 
   def workload
     'Transpose.transpose(input)'

exercises/triangle/.meta/generator/triangle_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class TriangleCase < ExerciseCase
+class TriangleCase < Generator::ExerciseCase
   def name
     initial = description.downcase
     replaced = initial.gsub(/(true|false)/, expected_type)

exercises/two-bucket/.meta/generator/two_bucket_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class TwoBucketCase < ExerciseCase
+class TwoBucketCase < Generator::ExerciseCase
   def name
     "test_bucket_one_size_#{bucket_one}_bucket_two_"\
     "size_#{bucket_two}_goal_#{goal}_start_with_bucket_#{start_bucket}"

exercises/word-count/.meta/generator/word_count_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class WordCountCase < ExerciseCase
+class WordCountCase < Generator::ExerciseCase
 
   def workload
     indent_lines([

exercises/wordy/.meta/generator/wordy_cases.rb

@@ -1,6 +1,6 @@
 require 'generator/exercise_cases'
 
-class WordyCase < ExerciseCase
+class WordyCase < Generator::ExerciseCase
 
   def workload
     [

lib/generator/exercise_case/assertion.rb

@@ -0,0 +1,33 @@
+module Generator
+  class ExerciseCase < OpenStruct
+    module Assertion
+
+      #  "#{assert} Luhn.valid?(#{input.inspect})"
+      def assert
+        expected ? 'assert' : 'refute'
+      end
+
+      # e.g.,
+      #   assert_equal { "PigLatin.translate(#{input.inspect})" }
+      def assert_equal
+        "assert_equal #{expected.inspect}, #{yield}"
+      end
+
+      # e.g.,
+      #   if raises_error?
+      #     assert_raises(ArgumentError) { test_case }
+      #   else
+      #     assert_equal { test_case }
+      #   end
+      def raises_error?
+        expected.to_i == -1
+      end
+
+      # e.g.,
+      #   assert_raises(ArgumentError) { test_case }
+      def assert_raises(error)
+        "assert_raises(#{error}) { #{yield} }"
+      end
+    end
+  end
+end