Add a spec for CreateStats service

spec/jobs/import_job_spec.rb

@@ -12,5 +12,11 @@ RSpec.describe ImportJob, type: :job do
     it 'creates points' do
       expect { perform }.to change { Point.count }.by(8)
     end
+
+    it 'calls StatCreatingJob' do
+      expect(StatCreatingJob).to receive(:perform_later).with(user.id)
+
+      perform
+    end
   end
 end

spec/services/create_stats_spec.rb

@@ -0,0 +1,34 @@
+require 'rails_helper'
+
+RSpec.describe CreateStats do
+  describe '#call' do
+    subject(:create_stats) { described_class.new(user_ids).call }
+
+    let(:user_ids) { [user.id] }
+    let(:user) { create(:user) }
+
+    context 'when there are no points' do
+      it 'does not create stats' do
+        expect { create_stats }.not_to change { Stat.count }
+      end
+    end
+
+    context 'when there are points' do
+      let!(:import) { create(:import, user: user) }
+      let!(:point_1) { create(:point, import: import, latitude: 0, longitude: 0) }
+      let!(:point_2) { create(:point, import: import, latitude: 1, longitude: 2) }
+      let!(:point_3) { create(:point, import: import, latitude: 3, longitude: 4) }
+
+
+      it 'creates stats' do
+        expect { create_stats }.to change { Stat.count }.by(1)
+      end
+
+      it 'calculates distance' do
+        create_stats
+
+        expect(Stat.last.distance).to eq(563)
+      end
+    end
+  end
+end