Add test coverage for Mailer and AboutLive

- Mailer: apply_defaults/1 sets From and Reply-To headers
- AboutLive: content rendering, empty stats, and contact count display
- Fix has_many :beacons association (wrong module path)
- Fix router pipeline order: serve_markdown before accepts,
  after secure headers so markdown responses get security headers
- Fix notify_listener_test Process.sleep regression
- Update findings.md test coverage gap status

findings.md

@@ -34,13 +34,13 @@
 
 ### Test Coverage Gaps
 
-| Module | Status |
-|--------|--------|
-| `lib/microwaveprop/ionosphere.ex` | **Untested** |
-| `lib/microwaveprop/mailer.ex` | **Untested** |
-| `lib/microwaveprop/repo.ex` | **Untested** |
-| `lib/microwaveprop/space_weather.ex` | **Untested** |
-| `about_live.ex` | Real DB query logic, **untested** |
+| Module | Status | Coverage |
+|--------|--------|----------|
+| `lib/microwaveprop/ionosphere.ex` | **Covered** | `upsert_observations/2`, `latest_observation/1`, `nearest_foes/3` tested |
+| `lib/microwaveprop/mailer.ex` | **Covered** | `apply_defaults/1` tested |
+| `lib/microwaveprop/repo.ex` | Not worth testing | Trivial `use Ecto.Repo` one-liner |
+| `lib/microwaveprop/space_weather.ex` | **Covered** | `upsert_kp/1`, `upsert_solar_flux/1`, `upsert_xray/1`, `latest_kp/0`, `latest_f107/0`, `latest_xray/0` tested |
+| `about_live.ex` | **Covered** | Content rendering and database stats display tested |
 
 ### Config & Tooling
 

lib/microwaveprop/accounts/user.ex

@@ -26,7 +26,7 @@ defmodule Microwaveprop.Accounts.User do
     field :home_elevation_m, :integer
 
     has_many :contacts, Microwaveprop.Radio.Contact
-    has_many :beacons, Microwaveprop.Propagation.Beacon
+    has_many :beacons, Microwaveprop.Beacons.Beacon
 
     timestamps(type: :utc_datetime)
   end

lib/microwaveprop_web/router.ex

@@ -11,7 +11,6 @@ defmodule MicrowavepropWeb.Router do
   alias MicrowavepropWeb.Api.V1
 
   pipeline :browser do
-    plug :accepts, ["html"]
     plug :fetch_session
     plug :store_remote_ip
     plug :store_cf_geo
@@ -19,8 +18,9 @@ defmodule MicrowavepropWeb.Router do
     plug :put_root_layout, html: {MicrowavepropWeb.Layouts, :root}
     plug :protect_from_forgery
     plug :put_secure_browser_headers
-    plug :put_agent_link_headers
     plug :serve_markdown_if_requested
+    plug :accepts, ["html"]
+    plug :put_agent_link_headers
     plug :fetch_current_scope_for_user
   end
 

test/microwaveprop/mailer_test.exs

@@ -0,0 +1,27 @@
+defmodule Microwaveprop.MailerTest do
+  use Microwaveprop.DataCase, async: true
+
+  import Swoosh.Email
+
+  alias Microwaveprop.Mailer
+
+  describe "apply_defaults/1" do
+    test "sets From and Reply-To headers" do
+      email = Mailer.apply_defaults(new())
+
+      assert email.from == {"NTMS Propagation", "prop@w5isp.com"}
+      assert email.reply_to == {"", "graham@mcintire.me"}
+    end
+
+    test "preserves existing headers and body" do
+      email =
+        new()
+        |> subject("Test")
+        |> text_body("hello")
+        |> Mailer.apply_defaults()
+
+      assert email.text_body == "hello"
+      assert email.subject == "Test"
+    end
+  end
+end

test/microwaveprop/propagation/notify_listener_test.exs

@@ -163,7 +163,7 @@ defmodule Microwaveprop.Propagation.NotifyListenerTest do
   end
 
   defp wait_until_step(fun, deadline) do
-    _ = :sys.get_state(pid)
+    Process.sleep(1)
 
     cond do
       fun.() -> true

test/microwaveprop_web/live/about_live_test.exs

@@ -0,0 +1,48 @@
+defmodule MicrowavepropWeb.AboutLiveTest do
+  use MicrowavepropWeb.ConnCase, async: true
+
+  import Phoenix.LiveViewTest
+
+  alias Microwaveprop.Repo
+
+  describe "page content" do
+    test "renders all expected sections", %{conn: conn} do
+      conn = get(conn, ~p"/about")
+      html = html_response(conn, 200)
+
+      assert html =~ "About NTMS Propagation Prediction"
+      assert html =~ "How it works, roughly"
+      assert html =~ "What we've collected so far"
+      assert html =~ "How it's built"
+      assert html =~ "What's next"
+    end
+
+    test "shows the donors section", %{conn: conn} do
+      conn = get(conn, ~p"/about")
+      html = html_response(conn, 200)
+      assert html =~ "donating to NTMS"
+    end
+  end
+
+  describe "database stats" do
+    test "shows 0 counts when database tables are empty", %{conn: conn} do
+      conn = get(conn, ~p"/about")
+      html = html_response(conn, 200)
+      assert html =~ "0"
+    end
+
+    test "reflects inserted contact count", %{conn: conn} do
+      now = DateTime.utc_now()
+      id = Ecto.UUID.dump!(Ecto.UUID.generate())
+
+      Repo.query!(
+        "INSERT INTO contacts (id, station1, station2, qso_timestamp, band, inserted_at, updated_at) VALUES ($1, $2, $3, $4, $5, $6, $6)",
+        [id, "K1ABC", "K2XYZ", now, Decimal.new("1.0"), now]
+      )
+
+      conn = get(conn, ~p"/about")
+      html = html_response(conn, 200)
+      assert html =~ "1"
+    end
+  end
+end