# frozen_string_literal: true

#
# Copyright (C) 2015 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/>.
#

require_relative "../api_spec_helper"

describe Api::Html::Content, type: :request do
  describe "apply_mathml" do
    context "valid latex" do
      before do
        @latex = '\frac{a}{b}'
        @node = Nokogiri::HTML5.fragment("<img alt='#{@latex}' />").children.first
      end

      it "retains the alt attribute" do
        Api::Html::Content.apply_mathml(@node)
        expect(@node["alt"]).to eql(@latex)
      end

      it "sets x-canvaslms-safe-mathml" do
        Api::Html::Content.apply_mathml(@node)
        expect(@node["x-canvaslms-safe-mathml"]).to eql(Ritex::Parser.new.parse(@latex))
      end
    end

    context "invalid latex" do
      before do
        @latex = '\frac{a}{' # incomplete
        @node = Nokogiri::HTML5.fragment("<img alt='#{@latex}' />").children.first
      end

      it "handles error gracefully" do
        expect { Api::Html::Content.apply_mathml(@node) }.not_to raise_error
      end

      it "retains the alt attribute" do
        Api::Html::Content.apply_mathml(@node)
        expect(@node["alt"]).to eql(@latex)
      end

      it "doesn't set x-canvaslms-safe-mathml" do
        Api::Html::Content.apply_mathml(@node)
        expect(@node["x-canvaslms-safe-mathml"]).to be_nil
      end
    end
  end
end
