Check for VERSION on BookKeeping module in binary_search_tree

exercises/binary-search-tree/.meta/solutions/binary_search_tree.rb

@@ -1,6 +1,4 @@
 class Bst
-  VERSION = 1
-
   attr_reader :data, :left, :right
   def initialize(data)
     @data = data
@@ -43,3 +41,7 @@ def insert_right(value)
     end
   end
 end
+
+module BookKeeping
+  VERSION = 1
+end

exercises/binary-search-tree/binary_search_tree_test.rb

@@ -99,16 +99,25 @@ def test_each_returns_enumerator_if_no_block
     assert_raises(StopIteration) { each_enumerator.next }
   end
 
-  # Problems in exercism evolve over time,
-  # as we find better ways to ask questions.
+  # 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 Bst.
+  # 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_equal 1, Bst::VERSION
+    assert_equal 1, BookKeeping::VERSION
   end
 end