Epigene · January 29, 2021 14:14 · Jan 29, 2021
diff --git a/spec.rb b/spec.rb
@@ -0,0 +1,48 @@
+describe "#current_agreement_vehicle assoc", :slow, travel_to: "2021-01-01" do
+  let!(:vehicle1) do
+    Timecop.freeze(1.day.ago) { create(:vehicle) }
+  end
+
+  let!(:vehicle2) do
+    Timecop.freeze(2.days.ago) { create(:vehicle) }
+  end
+
+  let(:av1_2) do
+    Timecop.freeze(18.seconds.ago) do
+      create(:agreement_vehicle, owner: create(:admin), vehicle: vehicle1, state: Vehicle::STATE_ACTIVE_LOAN)
+    end
+  end
+
+  let(:av2_2) do
+    Timecop.freeze(10.seconds.ago) do
+      create(:agreement_vehicle, owner: create(:admin), vehicle: vehicle2, state: Vehicle::STATE_REGISTERED)
+    end
+  end
+
+  # This produces a 2x2 matrix of agreement_vehicle records
+  # veh1 old = "registered"
+  # veh1 new = "active"
+  # veh2 old = "active"
+  # veh2 new = "registered"
+  #
+  # So if we query for "latest" that are active only veh1 should get selected
+  before do
+    vehicle2.agreement_vehicles.update_all(state: Vehicle::STATE_ACTIVE_LOAN)
+    av1_2
+    av2_2
+  end
+
+  it "returns the correct association when used as a method, and correcly joins" do
+    expect(vehicle1.reload.latest_agreement_vehicle).to eq(av1_2)
+    expect(vehicle2.reload.latest_agreement_vehicle).to eq(av2_2)
+
+    vehicles_with_currently_active_state = Vehicle.
+      joins(:latest_agreement_vehicle).
+      merge(AgreementVehicle.where(state: Vehicle::STATE_ACTIVE_LOAN))
+
+    expect(vehicles_with_currently_active_state).to(
+      contain(vehicle1).
+      and exclude(vehicle2)
+    )
+  end
+end