Redmine

        # Discards the cached versions of the given plugin so that they are

        # reloaded from the database. Discards those of all plugins if no plugin is given

        def clear_cached_versions(plugin = nil)

          if plugin

            @all_versions&.delete(plugin.id.to_s)

          else

            @all_versions = nil

          end

        end

        self.class.clear_cached_versions(current_plugin)

  def test_migrate_should_not_use_stale_cached_versions

    plugin = @klass.register :foo_plugin do

      name 'Foo plugin'

      version '0.0.1'

    end

    migrator = Redmine::Plugin::Migrator

    Dir.mktmpdir do |dir|

      {'001_foo_plugin_stale_cache_first.rb' => 'FooPluginStaleCacheFirst',

       '002_foo_plugin_stale_cache_second.rb' => 'FooPluginStaleCacheSecond'}.each do |filename, class_name|

        File.write(

          File.join(dir, filename),

          "class #{class_name} < ActiveRecord::Migration[8.1]\n  def up; end\n\n  def down; end\nend\n"

        )

      end

      plugin.stubs(:migration_directory).returns(dir)

      ActiveRecord::Migration.suppress_messages do

        plugin.migrate(1)

        assert_equal 1, migrator.current_version(plugin)

        plugin.migrate

        assert_equal 2, migrator.current_version(plugin)

        plugin.migrate(0)

        assert_equal 0, migrator.current_version(plugin)

        plugin.migrate

        assert_equal 2, migrator.current_version(plugin)

      end

    end

  ensure

    Redmine::Plugin::Migrator.clear_cached_versions

  end