paper-trail-gem--paper_trail/test/unit/serializer_test.rb

require "test_helper"
require "custom_json_serializer"

class SerializerTest < ActiveSupport::TestCase
  context "YAML Serializer" do
    setup do
      Fluxor.instance_eval <<-END
        has_paper_trail
      END

      @fluxor = Fluxor.create name: "Some text."

      # this is exactly what PaperTrail serializes
      @original_fluxor_attributes = @fluxor.send(:attributes_before_change)

      @fluxor.update_attributes name: "Some more text."
    end

    should "work with the default `YAML` serializer" do
      # Normal behaviour
      assert_equal 2, @fluxor.versions.length
      assert_nil @fluxor.versions[0].reify
      assert_equal "Some text.", @fluxor.versions[1].reify.name

      # Check values are stored as `YAML`.
      assert_equal @original_fluxor_attributes, YAML.load(@fluxor.versions[1].object)
      assert_equal YAML.dump(@original_fluxor_attributes), @fluxor.versions[1].object
    end
  end

  context "JSON Serializer" do
    setup do
      PaperTrail.configure do |config|
        config.serializer = PaperTrail::Serializers::JSON
      end

      Fluxor.instance_eval <<-END
        has_paper_trail
      END

      @fluxor = Fluxor.create name: "Some text."

      # this is exactly what PaperTrail serializes
      @original_fluxor_attributes = @fluxor.send(:attributes_before_change)

      @fluxor.update_attributes name: "Some more text."
    end

    teardown do
      PaperTrail.config.serializer = PaperTrail::Serializers::YAML
    end

    should "reify with JSON serializer" do
      # Normal behaviour
      assert_equal 2, @fluxor.versions.length
      assert_nil @fluxor.versions[0].reify
      assert_equal "Some text.", @fluxor.versions[1].reify.name

      # Check values are stored as JSON.
      assert_equal @original_fluxor_attributes,
        ActiveSupport::JSON.decode(@fluxor.versions[1].object)
      assert_equal ActiveSupport::JSON.encode(@original_fluxor_attributes),
        @fluxor.versions[1].object
    end

    should "store object_changes" do
      initial_changeset = {"name" => [nil, "Some text."], "id" => [nil, @fluxor.id]}
      second_changeset =  {"name"=>["Some text.", "Some more text."]}
      assert_equal initial_changeset, @fluxor.versions[0].changeset
      assert_equal second_changeset,  @fluxor.versions[1].changeset
    end
  end

  context "Custom Serializer" do
    setup do
      PaperTrail.configure do |config|
        config.serializer = CustomJsonSerializer
      end

      Fluxor.instance_eval <<-END
        has_paper_trail
      END

      @fluxor = Fluxor.create

      # this is exactly what PaperTrail serializes
      @original_fluxor_attributes = @fluxor.
        send(:attributes_before_change).
        reject { |_k, v| v.nil? }

      @fluxor.update_attributes name: "Some more text."
    end

    teardown do
      PaperTrail.config.serializer = PaperTrail::Serializers::YAML
    end

    should "reify with custom serializer" do
      # Normal behaviour
      assert_equal 2, @fluxor.versions.length
      assert_nil @fluxor.versions[0].reify
      assert_nil @fluxor.versions[1].reify.name

      # Check values are stored as JSON.
      assert_equal @original_fluxor_attributes,
        ActiveSupport::JSON.decode(@fluxor.versions[1].object)
      assert_equal ActiveSupport::JSON.encode(@original_fluxor_attributes),
        @fluxor.versions[1].object
    end

    should "store object_changes" do
      initial_changeset = {"id" => [nil, @fluxor.id]}
      second_changeset =  {"name"=>[nil, "Some more text."]}
      assert_equal initial_changeset, @fluxor.versions[0].changeset
      assert_equal second_changeset,  @fluxor.versions[1].changeset
    end
  end
end