code @ informatikaMihelac

Check if target database table is of MyIsam type. You have two options, first is not to use transactional fixtures in tests:

self.use_transactional_fixtures = false

Second and better option is to convert all tables to InnoDB tables. This migration can help converting:

class MyIsam2InnoDb < ActiveRecord::Migration
  def self.up
    ActiveRecord::Base.connection.tables.each {|t| 
        execute "ALTER TABLE #{t} TYPE=InnoDB"}
  end

  def self.down
  end
end