Redmine

    if assigned_to.is_a?(User) &&

        assigned_to.active? &&

        assigned_to.pref.auto_watch_on?('issue_assigned_to_me') &&

        self.watcher_user_ids.exclude?(assigned_to.id)

      self.set_watcher(assigned_to, true)

    end

  def test_create_should_add_assignee_as_watcher

    user = User.first

    user.pref.auto_watch_on = []

    user.pref.save

    assignee = User.find(2)

    assignee.pref.auto_watch_on = ['issue_assigned_to_me']

    assignee.pref.save

    issue = Issue.new(:project_id => 1, :tracker_id => 1, :author_id => user.id, :assigned_to => assignee, :subject => 'test_create_should_add_assignee_as_watcher')

    assert_difference 'Watcher.count', 1 do

      assert_equal true, issue.save

    end

    assert issue.watched_by?(assignee)

  end

  def test_create_should_not_add_assignee_as_watcher_without_preference

    user = User.first

    user.pref.auto_watch_on = []

    user.pref.save

    assignee = User.find(2)

    assignee.pref.auto_watch_on = []

    assignee.pref.save

    issue = Issue.new(:project_id => 1, :tracker_id => 1, :author_id => user.id, :assigned_to => assignee, :subject => 'test_create_should_not_add_assignee_as_watcher')

    assert_no_difference 'Watcher.count' do

      assert_equal true, issue.save

    end

  end

  def test_create_should_add_assignee_watcher_only_once_when_author_is_assignee

    user = User.first

    user.pref.auto_watch_on = %w[issue_created issue_assigned_to_me]

    user.pref.save

    issue = Issue.new(:project_id => 1, :tracker_id => 1, :author_id => user.id, :assigned_to => user, :subject => 'test_create_should_add_assignee_watcher_only_once')

    assert_difference 'Watcher.count', 1 do

      assert_equal true, issue.save

    end

  end