diff --git a/test/microwaveprop/propagation/asos_nudge_test.exs b/test/microwaveprop/propagation/asos_nudge_test.exs
index b4a8d304..c445bee0 100644
--- a/test/microwaveprop/propagation/asos_nudge_test.exs
+++ b/test/microwaveprop/propagation/asos_nudge_test.exs
@@ -159,7 +159,7 @@ defmodule Microwaveprop.Propagation.AsosNudgeTest do
 
       results = AsosNudge.compute([obs], @valid_time, [hrrr])
 
-      assert length(results) > 0
+      assert results != []
 
       for result <- results do
         assert result.lat == 32.0
@@ -189,7 +189,7 @@ defmodule Microwaveprop.Propagation.AsosNudgeTest do
 
       results = AsosNudge.compute([], @valid_time, [far_cell], rain_grid)
 
-      assert length(results) > 0
+      assert results != []
       lat_lons = results |> Enum.map(&{&1.lat, &1.lon}) |> Enum.uniq()
       assert {40.0, -85.0} in lat_lons
     end
diff --git a/test/microwaveprop/workers/backfill_enqueue_worker_test.exs b/test/microwaveprop/workers/backfill_enqueue_worker_test.exs
index 2b48df40..d7920f63 100644
--- a/test/microwaveprop/workers/backfill_enqueue_worker_test.exs
+++ b/test/microwaveprop/workers/backfill_enqueue_worker_test.exs
@@ -56,11 +56,19 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorkerTest do
     :ok
   end
 
+  # ERA5 goes through Copernicus CDS API which is async (submit → poll → download)
+  # and has no Req.Test plug hook, so inline Oban would block on Process.sleep.
+  # These tests exercise the non-ERA5 enrichment path; ERA5 has its own coverage.
+  @non_era5_types ["hrrr", "weather", "terrain", "iemre"]
+
   describe "perform/1" do
     test "enqueues enrichment jobs for pending contacts" do
       create_contact()
 
-      assert :ok = BackfillEnqueueWorker.perform(%Oban.Job{args: %{"limit" => 10}})
+      assert :ok =
+               BackfillEnqueueWorker.perform(%Oban.Job{
+                 args: %{"limit" => 10, "types" => @non_era5_types}
+               })
     end
 
     test "does not enqueue for already-complete contacts" do
@@ -75,7 +83,10 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorkerTest do
       })
       |> Repo.update!()
 
-      assert :ok = BackfillEnqueueWorker.perform(%Oban.Job{args: %{"limit" => 10}})
+      assert :ok =
+               BackfillEnqueueWorker.perform(%Oban.Job{
+                 args: %{"limit" => 10, "types" => @non_era5_types}
+               })
     end
 
     test "respects limit parameter" do
@@ -84,7 +95,10 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorkerTest do
         create_contact(%{qso_timestamp: ts})
       end
 
-      assert :ok = BackfillEnqueueWorker.perform(%Oban.Job{args: %{"limit" => 2}})
+      assert :ok =
+               BackfillEnqueueWorker.perform(%Oban.Job{
+                 args: %{"limit" => 2, "types" => @non_era5_types}
+               })
     end
 
     test "broadcasts enqueue_complete with count" do
@@ -92,7 +106,10 @@ defmodule Microwaveprop.Workers.BackfillEnqueueWorkerTest do
 
       create_contact()
 
-      assert :ok = BackfillEnqueueWorker.perform(%Oban.Job{args: %{"limit" => 10}})
+      assert :ok =
+               BackfillEnqueueWorker.perform(%Oban.Job{
+                 args: %{"limit" => 10, "types" => @non_era5_types}
+               })
 
       assert_receive {:enqueue_complete, 1}
     end