diff --git a/spec/serializers/event_schedule_serializer_spec.rb b/spec/serializers/event_schedule_serializer_spec.rb
new file mode 100644
index 00000000..9d8c62c0
--- /dev/null
+++ b/spec/serializers/event_schedule_serializer_spec.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe EventScheduleSerializer, type: :serializer do
+  let(:start) { DateTime.new(2000, 1, 2, 3, 4, 5) }
+  let(:conference) { create(:conference, start_date: start.to_date, start_hour: start.hour) }
+  let(:program) { create(:program, conference: conference) }
+  let(:event) { create(:event, program: program) }
+  let(:event_schedule) { create(:event_schedule, event: event, start_time: start) }
+  let(:serializer) { described_class.new(event_schedule) }
+
+  it 'sets date and room' do
+    expected_json = {
+      date: ' 2000-01-02T03:04:05+0000 ',
+      room: event_schedule.room.guid
+    }.to_json
+
+    expect(serializer.to_json).to eq expected_json
+  end
+end