Add base infra to store assets

test/music_library/assets_test.exs

@@ -0,0 +1,34 @@
+defmodule MusicLibrary.AssetsTest do
+  use MusicLibrary.DataCase
+
+  alias MusicLibrary.Assets
+
+  describe "store/1" do
+    test "stores using the hash as key" do
+      params = %{
+        content: "some content",
+        format: "text/plain",
+        properties: %{language: "english"}
+      }
+
+      assert {:ok, asset} = Assets.store(params)
+      assert asset.hash == "290F493C44F5D63D06B374D0A5ABD292FAE38B92CAB2FAE5EFEFE1B0E9347F56"
+      assert asset.properties == %{"language" => "english"}
+      assert asset.content == "some content"
+      assert asset.format == "text/plain"
+    end
+
+    test "prevents duplicates" do
+      params = %{
+        content: "some content",
+        format: "text/plain",
+        properties: %{language: "english"}
+      }
+
+      assert {:ok, _asset} = Assets.store(params)
+      assert {:error, changeset} = Assets.store(params)
+
+      assert [hash: {"has already been taken", _}] = changeset.errors
+    end
+  end
+end