add tests

test/support/external_format.ex

@@ -15,7 +15,13 @@ defmodule FeedReader.TestSupport.ExternalFormat do
   def handler, do: FeedReader.TestSupport.ExternalFormatHandler
 
   @impl true
-  def new_parser_state(event_sink, opts), do: %{event_sink: event_sink, opts: opts}
+  def new_parser_state(event_sink, opts) do
+    if notify = Keyword.get(opts, :notify_parser) do
+      send(notify, {:parser_pid, self()})
+    end
+
+    %{event_sink: event_sink, opts: opts}
+  end
 
   @impl true
   def normalize_feed(_state, _opts), do: %Feed{title: "External", type: :rss}

test/support/external_format_handler.ex

@@ -2,6 +2,22 @@ defmodule FeedReader.TestSupport.ExternalFormatHandler do
   @moduledoc false
   @behaviour Saxy.Handler
 
+  alias FeedReader.Feed
+
   @impl true
+  def handle_event(:start_document, _data, %{opts: opts} = state) do
+    if Keyword.get(opts, :emit_event), do: emit_event(state)
+
+    {:ok, state}
+  end
+
+  def handle_event(:end_document, _data, %{opts: opts} = state) do
+    if Keyword.get(opts, :emit_event), do: emit_event(state)
+
+    {:ok, state}
+  end
+
   def handle_event(_event_type, _data, state), do: {:ok, state}
+
+  defp emit_event(state), do: state.event_sink.({:feed, %Feed{title: "External", type: :rss}})
 end

test/support/parser_halt_format.ex

@@ -13,6 +13,7 @@ defmodule FeedReader.TestSupport.ParserHaltFormat do
   @impl true
   def new_parser_state(_event_sink, opts) do
     if Keyword.get(opts, :normal_exit), do: exit(:normal)
+    if Keyword.get(opts, :abnormal_exit), do: exit(:parser_crashed)
     nil
   end