[test] on MariaDB 10.2+ we're allowed to change default

... we previously only tested against MariaDB 10.0/10.1

Author: kares

test/db/mysql/change_column_test.rb

@@ -13,12 +13,12 @@ class MySQLChangeColumnTest < Test::Unit::TestCase
       ActiveRecord::Migration.add_column :people, :about, :string, :default => 'x'
       # NOTE: even in non strict mode MySQL does not allow us add or change
       # text/binary with a default ...
-      if ar_version('4.2')
+      if mariadb_server? && ActiveRecord::Base.connection.database_version >= '10.2'
+        ActiveRecord::Migration.change_column :people, :about, :text
+      else
         assert_raises ActiveRecord::StatementInvalid do
           ActiveRecord::Migration.change_column :people, :about, :text
         end
-      else
-        ActiveRecord::Migration.change_column :people, :about, :text
       end
       ActiveRecord::Migration.add_column :people, :photo, :binary
     end