Add a very lousy spec for GPX serializer

spec/serializers/points/geojson_serializer_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Points::GeojsonSerializer do
+  describe '#call' do
+    subject(:serializer) { described_class.new(points).call }
+
+    let(:points) { create_list(:point, 3) }
+    let(:expected_json) do
+      {
+        type: 'FeatureCollection',
+        features: points.map do |point|
+          {
+            type: 'Feature',
+            geometry: {
+              type: 'Point',
+              coordinates: [point.longitude, point.latitude]
+            },
+            properties: PointSerializer.new(point).call
+          }
+        end
+      }
+    end
+
+    it 'returns JSON' do
+      expect(serializer).to eq(expected_json.to_json)
+    end
+  end
+end

spec/serializers/points/gpx_serializer.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Points::GpxSerializer do
+  describe '#call' do
+    subject(:serializer) { described_class.new(points).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 JSON' do
+      expect(serializer).to be_a(GPX::GPXFile)
+    end
+  end
+end