diff --git a/test/microwaveprop/logger_format_test.exs b/test/microwaveprop/logger_format_test.exs
index 30b148a2..50dcf948 100644
--- a/test/microwaveprop/logger_format_test.exs
+++ b/test/microwaveprop/logger_format_test.exs
@@ -2,12 +2,18 @@ defmodule Microwaveprop.LoggerFormatTest do
   # async: false — we briefly swap the global :default :logger handler's
   # formatter and forward its output to a self()-bound IO device so the
   # test can capture the JSON-encoded output. Restored on exit.
+  #
+  # Opts out of the suite-wide capture_log flag — capture_log hot-swaps
+  # the :default handler for its own capture handler, so our direct
+  # :logger.get_handler_config(:default) lookup in setup would 404.
   use ExUnit.Case, async: false
 
   alias LoggerJSON.Formatters.Basic
 
   require Logger
 
+  @moduletag capture_log: false
+
   describe "structured JSON formatter" do
     setup do
       {:ok, handler_cfg} = :logger.get_handler_config(:default)
diff --git a/test/microwaveprop_web/live/contact_map_live_test.exs b/test/microwaveprop_web/live/contact_map_live_test.exs
index 8c3c6b4a..4523dbc2 100644
--- a/test/microwaveprop_web/live/contact_map_live_test.exs
+++ b/test/microwaveprop_web/live/contact_map_live_test.exs
@@ -6,7 +6,7 @@ defmodule MicrowavepropWeb.ContactMapLiveTest do
   alias Microwaveprop.Radio.Contact
   alias Microwaveprop.Repo
 
-  defp create_contact(attrs \\ %{}) do
+  defp create_contact(attrs) do
     default = %{
       station1: "W5XD",
       station2: "K5TR",
diff --git a/test/microwaveprop_web/telemetry_test.exs b/test/microwaveprop_web/telemetry_test.exs
index 6b3207d9..00c72a10 100644
--- a/test/microwaveprop_web/telemetry_test.exs
+++ b/test/microwaveprop_web/telemetry_test.exs
@@ -93,8 +93,10 @@ defmodule MicrowavepropWeb.TelemetryTest do
       {:ok, pid} = Supervisor.start_link(Telemetry, :ok, name: sup_name)
       assert Process.alive?(pid)
 
-      on_exit = fn -> if Process.alive?(pid), do: Process.exit(pid, :kill) end
-      on_exit.()
+      # Unlink before tearing down so the brutal-kill exit signal doesn't
+      # propagate to the test process (which trap_exit defaults to off).
+      Process.unlink(pid)
+      Process.exit(pid, :kill)
     end
   end
 end
diff --git a/test/mix/tasks/simple_tasks_test.exs b/test/mix/tasks/simple_tasks_test.exs
index 20cb2c9b..17e7866c 100644
--- a/test/mix/tasks/simple_tasks_test.exs
+++ b/test/mix/tasks/simple_tasks_test.exs
@@ -118,8 +118,6 @@ defmodule Mix.Tasks.SimpleTasksTest do
     end
 
     test "enqueues jobs for the top hours when contacts exist" do
-      import Ecto.Query
-
       # Seed one contact so top_hours_by_contact_count returns something.
       {:ok, _contact} =
         %Contact{}
diff --git a/test/test_helper.exs b/test/test_helper.exs
index 62f1ca42..718d7007 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -1,2 +1,2 @@
-ExUnit.start(exclude: [:slow])
+ExUnit.start(exclude: [:slow], capture_log: true)
 Ecto.Adapters.SQL.Sandbox.mode(Microwaveprop.Repo, :manual)