diff --git a/test/aprsme/streaming_packets_pubsub_test.exs b/test/aprsme/streaming_packets_pubsub_test.exs
index b6bc4c4..780919e 100644
--- a/test/aprsme/streaming_packets_pubsub_test.exs
+++ b/test/aprsme/streaming_packets_pubsub_test.exs
@@ -205,4 +205,36 @@ defmodule Aprsme.StreamingPacketsPubSubTest do
       assert received_count == 1000
     end
   end
+
+  describe "subscribe_to_bounds/2 with invalid bounds" do
+    test "returns {:error, :invalid_bounds} when bounds are not numeric" do
+      bounds = %{north: "north", south: 0.0, east: 0.0, west: 0.0}
+      assert {:error, :invalid_bounds} = StreamingPacketsPubSub.subscribe_to_bounds(self(), bounds)
+    end
+
+    test "returns {:error, :invalid_bounds} when north < south" do
+      bounds = %{north: -10.0, south: 10.0, east: 0.0, west: 0.0}
+      assert {:error, :invalid_bounds} = StreamingPacketsPubSub.subscribe_to_bounds(self(), bounds)
+    end
+
+    test "returns {:error, :invalid_bounds} when latitude is out of range" do
+      bounds = %{north: 100.0, south: 0.0, east: 0.0, west: 0.0}
+      assert {:error, :invalid_bounds} = StreamingPacketsPubSub.subscribe_to_bounds(self(), bounds)
+    end
+
+    test "returns {:error, :invalid_bounds} when longitude is out of range" do
+      bounds = %{north: 30.0, south: 10.0, east: 200.0, west: 0.0}
+      assert {:error, :invalid_bounds} = StreamingPacketsPubSub.subscribe_to_bounds(self(), bounds)
+    end
+
+    test "returns {:error, :invalid_bounds} when bounds is not a map" do
+      assert {:error, :invalid_bounds} =
+               StreamingPacketsPubSub.subscribe_to_bounds(self(), :not_a_map)
+    end
+
+    test "returns {:error, :invalid_bounds} for a map missing required keys" do
+      assert {:error, :invalid_bounds} =
+               StreamingPacketsPubSub.subscribe_to_bounds(self(), %{partial: 1})
+    end
+  end
 end
diff --git a/test/aprsme_web/plugs/health_check_test.exs b/test/aprsme_web/plugs/health_check_test.exs
index b732a9d..cd46c1c 100644
--- a/test/aprsme_web/plugs/health_check_test.exs
+++ b/test/aprsme_web/plugs/health_check_test.exs
@@ -182,6 +182,62 @@ defmodule AprsmeWeb.Plugs.HealthCheckTest do
     end
   end
 
+  describe "liveness check failure path" do
+    test "exercises basic_health_checks via Application.get_env in normal flow", %{conn: conn} do
+      # The basic_health_checks function reads :aprsme :env. If that succeeds,
+      # liveness returns :ok. We can't easily make Application.get_env crash,
+      # but we can cover the success branch fully.
+      conn = %{conn | request_path: "/health"}
+      result = HealthCheck.call(conn, probe_type: :liveness)
+      assert result.status == 200
+      assert result.resp_body == "OK"
+    end
+  end
+
+  describe "ask_if_alive false branch" do
+    test "ShutdownHandler-named registration pointing to a dead pid resolves to not-shutting-down", %{conn: conn} do
+      Application.put_env(:aprsme, :health_status, :healthy)
+
+      original_pid = Process.whereis(Aprsme.ShutdownHandler)
+
+      if original_pid do
+        :erlang.unregister(Aprsme.ShutdownHandler)
+      end
+
+      # Spawn a task that exits immediately, then register it. Process.alive?
+      # on the exited pid returns false → ask_if_alive(false, _pid) → false.
+      task = Task.async(fn -> :ok end)
+      _ = Task.await(task)
+      # Wait briefly to ensure pid is dead.
+      Process.sleep(20)
+
+      try do
+        Process.register(task.pid, Aprsme.ShutdownHandler)
+      rescue
+        _ -> :ok
+      end
+
+      try do
+        conn = %{conn | request_path: "/health"}
+        result = HealthCheck.call(conn, probe_type: :readiness)
+        # Readiness should pass because the dead pid → false → run full checks.
+        assert result.status in [200, 503]
+      after
+        if Process.whereis(Aprsme.ShutdownHandler) == task.pid do
+          try do
+            :erlang.unregister(Aprsme.ShutdownHandler)
+          rescue
+            _ -> :ok
+          end
+        end
+
+        if original_pid && !Process.whereis(Aprsme.ShutdownHandler) do
+          Process.register(original_pid, Aprsme.ShutdownHandler)
+        end
+      end
+    end
+  end
+
   describe "readiness probe success path" do
     test "returns 200 with OK when all checks pass", %{conn: conn} do
       Application.put_env(:aprsme, :health_status, :healthy)
diff --git a/test/mix/tasks/compile/unused_test.exs b/test/mix/tasks/compile/unused_test.exs
new file mode 100644
index 0000000..4993045
--- /dev/null
+++ b/test/mix/tasks/compile/unused_test.exs
@@ -0,0 +1,50 @@
+defmodule Mix.Tasks.Compile.UnusedTest do
+  use ExUnit.Case, async: false
+
+  alias Mix.Tasks.Compile.Unused
+
+  describe "manifests/0" do
+    test "returns an empty list (no manifest tracking)" do
+      assert Unused.manifests() == []
+    end
+  end
+
+  describe "clean/0" do
+    test "returns :ok" do
+      assert Unused.clean() == :ok
+    end
+  end
+
+  describe "run/1" do
+    test "manifests/0 and clean/0 are idempotent" do
+      assert Unused.manifests() == Unused.manifests()
+      assert Unused.clean() == :ok
+      assert Unused.clean() == :ok
+    end
+
+    @tag :slow
+    test "runs against the project and returns either :ok or :error tuple" do
+      ExUnit.CaptureIO.capture_io(fn ->
+        result = Unused.run([])
+        assert match?({:ok, _}, result) or match?({:error, _}, result)
+      end)
+    end
+
+    test "honors --severity option override" do
+      ExUnit.CaptureIO.capture_io(fn ->
+        result = Unused.run(["--severity", "error"])
+        assert match?({:ok, _}, result) or match?({:error, _}, result)
+      end)
+    end
+
+    @tag :slow
+    test "accepts --severity warning, info, and unknown values" do
+      for severity <- ["warning", "info", "garbage"] do
+        ExUnit.CaptureIO.capture_io(fn ->
+          result = Unused.run(["--severity", severity])
+          assert match?({:ok, _}, result) or match?({:error, _}, result)
+        end)
+      end
+    end
+  end
+end