Return a GPX::GPXFile object instead of a string in Points::GpxSerializer

app/serializers/points/gpx_serializer.rb

@@ -24,7 +24,10 @@ class Points::GpxSerializer
       )
     end
 
-    gpx_file.to_s.sub('<gpx', '<gpx xmlns="http://www.topografix.com/GPX/1/1"')
+    GPX::GPXFile.new(
+      name: "dawarich_#{name}",
+      gpx_data: gpx_file.to_s.sub('<gpx', '<gpx xmlns="http://www.topografix.com/GPX/1/1"')
+    )
   end
 
   private

spec/serializers/points/gpx_serializer_spec.rb

@@ -4,26 +4,25 @@ require 'rails_helper'
 
 RSpec.describe Points::GpxSerializer do
   describe '#call' do
-    subject(:serializer) { described_class.new(points).call }
+    subject(:serializer) { described_class.new(points, 'some_name').call }
 
     let(:points) { create_list(:point, 3) }
-    let(:geojson_data) { Points::GeojsonSerializer.new(points).call }
-    let(:gpx) { GPX::GeoJSON.convert_to_gpx(geojson_data:) }
 
     it 'returns GPX file' do
       expect(serializer).to be_a(GPX::GPXFile)
     end
 
     it 'includes waypoints' do
-      expect(serializer.waypoints.size).to eq(3)
+      expect(serializer.tracks[0].points.size).to eq(3)
     end
 
     it 'includes waypoints with correct attributes' do
-      serializer.waypoints.each_with_index do |waypoint, index|
+      serializer.tracks[0].points.each_with_index do |track_point, index|
         point = points[index]
-        expect(waypoint.lat).to eq(point.latitude)
-        expect(waypoint.lon).to eq(point.longitude)
-        expect(waypoint.time).to eq(point.recorded_at)
+
+        expect(track_point.lat).to eq(point.latitude)
+        expect(track_point.lon).to eq(point.longitude)
+        expect(track_point.time).to eq(point.recorded_at)
       end
     end
   end