added tests for copy_database

lib/mongo/connection.rb

@@ -120,18 +120,17 @@ module Mongo
       single_db_command(name, :dropDatabase => 1)
     end
 
-    # Copys the database +from+ on +host+ to +to+ on the executing server.
-    # +host+ is optional and will use localhost host if no value is provided.
-    def copy_database( from, to, host="localhost" )
+    # Copies the database +from+ on the local server to +to+ on the specified +host+.
+    # +host+ defaults to 'localhost' if no value is provided.
+    def copy_database(from, to, host="localhost")
       oh = OrderedHash.new
-      oh[:copydb]= 1
+      oh[:copydb]   = 1
       oh[:fromhost] = host
-      oh[:fromdb] = from
-      oh[:todb] = to
+      oh[:fromdb]   = from
+      oh[:todb]     = to
       single_db_command('admin', oh)
     end
 
-
     # Return the build information for the current connection.
     def server_info
       db("admin").command({:buildinfo => 1}, {:admin => true, :check_response => true})

test/test_connection.rb

@@ -53,6 +53,14 @@ class TestConnection < Test::Unit::TestCase
     @mongo.drop_database('ruby-mongo-info-test')
   end
 
+  def test_copy_database
+    @mongo.db('old').collection('copy-test').insert('a' => 1)
+    @mongo.copy_database('old', 'new')
+    old_object = @mongo.db('old').collection('copy-test').find.next_object
+    new_object = @mongo.db('new').collection('copy-test').find.next_object
+    assert_equal old_object, new_object
+  end
+
   def test_database_names
     @mongo.drop_database('ruby-mongo-info-test')
     @mongo.db('ruby-mongo-info-test').collection('info-test').insert('a' => 1)