[WIP] nth-prime: Add test file generator.

bin/generate-nth-prime

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+require_relative '../lib/helper'
+require 'generator'
+require 'nth_prime_cases'
+
+Generator.new('nth-prime', NthPrimeCases).generate

exercises/nth-prime/.version

@@ -0,0 +1 @@
+1

exercises/nth-prime/example.rb

@@ -1,3 +1,7 @@
+module BookKeeping
+  VERSION = 1
+end
+
 class Prime
   def self.nth(n)
     if n < 1

exercises/nth-prime/example.tt

@@ -0,0 +1,23 @@
+#!/usr/bin/env ruby
+gem 'minitest', '>= 5.0.0'
+require 'minitest/autorun'
+require_relative 'nth_prime'
+
+# Test data version:
+# <%= sha1 %>
+# Rubocop directives
+# rubocop:disable Style/NumericLiterals
+#
+class NthPrimeTest < Minitest::Test<% test_cases.each do |test_case| %>
+  def <%= test_case.name %><% if test_case.skipped? %>
+    skip<% end %><% if test_case.raises_error? %>
+    assert_raises(ArgumentError) { <%= test_case.actual %> }<% else %>
+    assert_equal <%= test_case.expected %>, <%= test_case.actual %><% end %>
+  end
+<% end %>
+<%= IO.read(XRUBY_LIB + '/bookkeeping.md') %>
+  def test_bookkeeping
+    skip
+    assert_equal <%= version.next %>, BookKeeping::VERSION
+  end
+end

exercises/nth-prime/nth_prime_test.rb

@@ -1,16 +1,19 @@
 #!/usr/bin/env ruby
-
 gem 'minitest', '>= 5.0.0'
 require 'minitest/autorun'
-
 require_relative 'nth_prime'
 
-class TestPrimes < Minitest::Test
-  def test_first
+# Test data version:
+# bb79e10
+# Rubocop directives
+# rubocop:disable Style/NumericLiterals
+#
+class NthPrimeTest < Minitest::Test
+  def test_first_prime
     assert_equal 2, Prime.nth(1)
   end
 
-  def test_second
+  def test_second_prime
     skip
     assert_equal 3, Prime.nth(2)
   end
@@ -22,13 +25,33 @@ def test_sixth_prime
 
   def test_big_prime
     skip
-    assert_equal 104_743, Prime.nth(10_001)
+    assert_equal 104743, Prime.nth(10001)
+  end
+
+  def test_there_is_no_zeroth_prime
+    skip
+    assert_raises(ArgumentError) { Prime.nth(0) }
   end
 
-  def test_weird_case
+  # Problems in exercism evolve over time, as we find better ways to ask
+  # questions.
+  # The version number refers to the version of the problem you solved,
+  # not your solution.
+  #
+  # Define a constant named VERSION inside of the top level BookKeeping
+  # module, which may be placed near the end of your file.
+  #
+  # In your file, it will look like this:
+  #
+  # module BookKeeping
+  #   VERSION = 1 # Where the version number matches the one in the test.
+  # end
+  #
+  # If you are curious, read more about constants on RubyDoc:
+  # http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html
+
+  def test_bookkeeping
     skip
-    assert_raises ArgumentError do
-      Prime.nth(0)
-    end
+    assert_equal 1, BookKeeping::VERSION
   end
 end

lib/nth_prime_cases.rb

@@ -0,0 +1,23 @@
+class NthPrimeCase < OpenStruct
+  def name
+    'test_%s' % description.downcase.gsub(/[ -]/, '_')
+  end
+
+  def actual
+    "Prime.nth(#{input})"
+  end
+
+  def raises_error?
+    expected == false
+  end
+
+  def skipped?
+    index > 0
+  end
+end
+
+NthPrimeCases = proc do |data|
+  JSON.parse(data)['cases'].map.with_index do |row, i|
+    NthPrimeCase.new(row.merge('index' => i))
+  end
+end