[test] fix accessing db config hash

Author: dr-itz

test/db/mysql/change_column_test.rb

@@ -38,10 +38,10 @@ class MySQLChangeColumnTest < Test::Unit::TestCase
   def run_without_connection
     original_connection = ActiveRecord::Base.remove_connection
     begin
-      yield original_connection
+      yield original_connection.configuration_hash
     ensure
       ActiveRecord::Base.establish_connection(original_connection)
     end
   end
 
-end
+end

test/db/mysql/connection_test.rb

@@ -43,7 +43,7 @@ def select_rows(sql)
   def run_without_connection
     original_connection = ActiveRecord::Base.remove_connection
     begin
-      yield original_connection
+      yield original_connection.configuration_hash
     ensure
       ActiveRecord::Base.establish_connection(original_connection)
     end

test/db/postgresql/redshift_test.rb

@@ -42,7 +42,7 @@ def show_time_zone(connection = self.connection)
   def run_with_connection_removed
     config = ActiveRecord::Base.remove_connection
     begin
-      yield config
+      yield config.configuration_hash
     ensure
       ActiveRecord::Base.establish_connection(config)
     end