Updated video downloader to use full URL; improved docs (#35)

test/pinchflat/media_client/video_downloader_test.exs

@@ -19,7 +19,8 @@ defmodule Pinchflat.MediaClient.VideoDownloaderTest do
 
   describe "download_for_media_item/3" do
     test "it calls the backend runner", %{media_item: media_item} do
-      expect(YtDlpRunnerMock, :run, fn _url, _opts, ot ->
+      expect(YtDlpRunnerMock, :run, fn url, _opts, ot ->
+        assert url == media_item.original_url
         assert ot == "after_move:%()j"
 
         {:ok, render_metadata(:media_metadata)}

test/support/fixtures/media_fixtures.ex

@@ -10,12 +10,14 @@ defmodule Pinchflat.MediaFixtures do
   Generate a media_item.
   """
   def media_item_fixture(attrs \\ %{}) do
+    media_id = Faker.String.base64(12)
+
     {:ok, media_item} =
       attrs
       |> Enum.into(%{
-        media_id: Faker.String.base64(12),
+        media_id: media_id,
         title: Faker.Commerce.product_name(),
-        original_url: "https://www.youtube.com/channel/#{Faker.String.base64(12)}",
+        original_url: "https://www.youtube.com/watch?v=#{media_id}",
         livestream: false,
         media_filepath: "/video/#{Faker.File.file_name(:video)}",
         source_id: SourcesFixtures.source_fixture().id