CreateTable supports all PG-specific columns even under Rails 4.0

Successive versions of Rails provided explicit support for more column
types such as `money` and `uuid`. However, the ability to create a
Postgres table with one of these column type is really dependent on
which Postgres version you're using, and not which Rails version you're
using -- all you have to do is use `t.column` rather than e.g.,
`t.money`, `t.uuid`, etc.

spec/support/unit/active_record/create_table.rb

@@ -47,14 +47,7 @@ module UnitTests
           column_options = {}
         end
 
-        begin
-          table.__send__(column_type, column_name, column_options)
-        rescue NoMethodError
-          raise ColumnNotSupportedError.new(
-            "#{Tests::Database.instance.adapter_class} does not support " +
-            ":#{column_type} columns."
-          )
-        end
+        table.column(column_name, column_type, column_options)
       end
     end
   end

spec/support/unit/model_creation_strategies/active_record.rb

@@ -72,8 +72,6 @@ module UnitTests
       def whitelist_attributes?
         options.fetch(:whitelist_attributes, true)
       end
-
-      ColumnNotSupportedError = Class.new(StandardError)
     end
   end
 end