test: Aprsme.Application config_change + module smoke

test/aprsme/application_test.exs

@@ -0,0 +1,26 @@
+defmodule Aprsme.ApplicationTest do
+  use ExUnit.Case, async: false
+
+  describe "config_change/3" do
+    test "returns :ok" do
+      assert :ok = Aprsme.Application.config_change(%{}, %{}, [])
+    end
+
+    test "returns :ok with populated change maps" do
+      assert :ok =
+               Aprsme.Application.config_change(
+                 %{secret_key_base: "x"},
+                 %{},
+                 [:removed_key]
+               )
+    end
+  end
+
+  describe "start/2" do
+    test "module is loaded and exports the Application behaviour callbacks" do
+      Code.ensure_loaded(Aprsme.Application)
+      assert function_exported?(Aprsme.Application, :start, 2)
+      assert function_exported?(Aprsme.Application, :config_change, 3)
+    end
+  end
+end