diff --git a/test/feed_reader/feed_test.exs b/test/feed_reader/feed_test.exs
new file mode 100644
index 0000000..5cd3201
--- /dev/null
+++ b/test/feed_reader/feed_test.exs
@@ -0,0 +1,30 @@
+defmodule FeedReader.FeedTest do
+  use ExUnit.Case, async: true
+
+  alias FeedReader.Feed
+
+  test "uses empty normalized metadata defaults" do
+    assert %Feed{
+             title: nil,
+             description: nil,
+             feed_url: nil,
+             html_url: nil,
+             type: nil,
+             categories: [],
+             extensions: %{}
+           } = %Feed{}
+  end
+
+  test "stores feed metadata and namespace extensions" do
+    feed = %Feed{
+      title: "Example",
+      type: :rss,
+      categories: ["news"],
+      extensions: %{"urn:example" => %{"priority" => 1}}
+    }
+
+    assert feed.title == "Example"
+    assert feed.type == :rss
+    assert feed.extensions["urn:example"]["priority"] == 1
+  end
+end
diff --git a/test/feed_reader/item_test.exs b/test/feed_reader/item_test.exs
new file mode 100644
index 0000000..c2632ab
--- /dev/null
+++ b/test/feed_reader/item_test.exs
@@ -0,0 +1,39 @@
+defmodule FeedReader.ItemTest do
+  use ExUnit.Case, async: true
+
+  alias FeedReader.Item
+
+  test "uses empty normalized item defaults" do
+    assert %Item{
+             uuid: nil,
+             title: nil,
+             content_full: nil,
+             content_summary: nil,
+             language: nil,
+             published_at: nil,
+             canonical_url: nil,
+             alternate: %{},
+             author: nil,
+             extensions: %{}
+           } = %Item{}
+  end
+
+  test "stores normalized content and extension metadata" do
+    published_at = ~U[2026-01-01 12:00:00Z]
+
+    item = %Item{
+      uuid: "item-1",
+      title: "Example item",
+      content_summary: "Summary",
+      language: :en,
+      published_at: published_at,
+      canonical_url: "https://example.com/item-1",
+      author: "Author",
+      extensions: %{"urn:example" => %{"rating" => "safe"}}
+    }
+
+    assert item.uuid == "item-1"
+    assert item.published_at == published_at
+    assert item.extensions["urn:example"]["rating"] == "safe"
+  end
+end