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Filename : scope_filter_spec.rb
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# frozen_string_literal: true

#
# Copyright (C) 2015 - present Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#

describe ScopeFilter do
  let_once(:current_course) { course_factory }
  let_once(:current_user) { course_factory.all_real_users.first }
  let_once(:scope_filter) { ScopeFilter.new(current_course, current_user) }
  describe "#initialize" do
    it "sets instance vars" do
      expect(scope_filter.context).to eq(current_course)
      expect(scope_filter.user).to eq(current_user)
    end

    describe "#concat_scope" do
      it "sets @relation as value returned from provided block" do
        scope_filter.send(:concat_scope) { Course.all }
        expect(scope_filter.instance_variable_get(:@relation)).to eq(Course.all)
      end

      it "maintains @relation when block returns a falsey value" do
        scope_filter.send(:concat_scope) { Course.all }
        expect(scope_filter.instance_variable_get(:@relation)).to eq(Course.all), "precondition"
        scope_filter.send(:concat_scope) { nil }
        expect(scope_filter.instance_variable_get(:@relation)).to eq(Course.all)
      end
    end
  end
end