Tests for the in_use flag

spec/factories/farm_event.rb

@@ -1,8 +1,8 @@
 FactoryBot.define do
   factory :farm_event do
     start_time { Date.yesterday - [*(1..5)].sample.days }
-    end_time { Date.today + 1.minute + ([*(1..5)].sample).days }
-    time_unit { FarmEvent::UNITS_OF_TIME.sample }
+    end_time   { Date.today + 1.minute + ([*(1..5)].sample).days }
+    time_unit  { FarmEvent::UNITS_OF_TIME.sample }
     repeat { [*(1..5)].sample }
     # device
     after(:build) do |s|

spec/mutations/flat_ir_stuff/fetch_celery_spec.rb

@@ -5,6 +5,38 @@ describe CeleryScript::FetchCelery do
   let(:user) { FactoryBot.create(:user) }
   let(:device) { user.device }
 
+  it "marks in_use as false when not in use" do
+    in_use = \
+      CeleryScript::FetchCelery.run!(sequence: FakeSequence.create())[:in_use]
+    expect(in_use).to be(false)
+  end
+
+  it "marks a sequence as in_use by Regimen" do
+    sequence = FakeSequence.create()
+    ri       = RegimenItem.new(time_offset: 100, sequence_id: sequence.id)
+    regimen  = FactoryBot.create(:regimen, regimen_items: [ri])
+    results  = CeleryScript::FetchCelery.run!(sequence: sequence)
+
+    expect(results[:in_use]).to be(true)
+  end
+
+  it "marks a sequence as in_use by FarmEvent" do
+    fe       = FactoryBot.create(:farm_event)
+    sequence = fe.executable
+    results  = CeleryScript::FetchCelery.run!(sequence: sequence)
+
+    expect(results[:in_use]).to be(true)
+  end
+
+  it "marks a sequence as in_use by Sequence" do
+    sequence = FakeSequence.create()
+    user     = FakeSequence.create(body: [
+      { kind: "execute", args: { sequence_id: sequence.id } }
+    ])
+    results  = CeleryScript::FetchCelery.run!(sequence: sequence)
+    expect(results[:in_use]).to be(true)
+  end
+
   __NOTHING______ = "nothing"
 
   it "Makes JSON that is identical to the legacy implementation - part 1" do