Override Rails's test prepare db task to source in postgis data

Postgis Test DB Preparation.rb

namespace :db do
  namespace :test do
    task :prepare_postgis do
      `/usr/local/pgsql/bin/psql dbname -f /usr/local/pgsql-9.0/share/contrib/postgis-1.5/postgis.sql -U postgres`
      `/usr/local/pgsql/bin/psql dbname -f /usr/local/pgsql-9.0/share/contrib/postgis-1.5/spatial_ref_sys.sql -U postgres`
    end
  end
end 

Rake::Task["db:test:prepare"].enhance do
  Rake::Task["db:test:prepare_postgis"].invoke
end