get started on route for creating links, dividing steps into components

test/entendu/links_test.exs

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+defmodule Entendu.LinksTest do
+  use Entendu.DataCase
+
+  alias Entendu.Links
+
+  describe "links" do
+    alias Entendu.Links.Link
+
+    @valid_attrs %{burn_after_reading: true, expires: "2010-04-17T14:00:00Z"}
+    @update_attrs %{burn_after_reading: false, expires: "2011-05-18T15:01:01Z"}
+    @invalid_attrs %{burn_after_reading: nil, expires: nil}
+
+    def link_fixture(attrs \\ %{}) do
+      {:ok, link} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Links.create_link()
+
+      link
+    end
+
+    test "list_links/0 returns all links" do
+      link = link_fixture()
+      assert Links.list_links() == [link]
+    end
+
+    test "get_link!/1 returns the link with given id" do
+      link = link_fixture()
+      assert Links.get_link!(link.id) == link
+    end
+
+    test "create_link/1 with valid data creates a link" do
+      assert {:ok, %Link{} = link} = Links.create_link(@valid_attrs)
+      assert link.burn_after_reading == true
+      assert link.expires == DateTime.from_naive!(~N[2010-04-17T14:00:00Z], "Etc/UTC")
+    end
+
+    test "create_link/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Links.create_link(@invalid_attrs)
+    end
+
+    test "update_link/2 with valid data updates the link" do
+      link = link_fixture()
+      assert {:ok, %Link{} = link} = Links.update_link(link, @update_attrs)
+      assert link.burn_after_reading == false
+      assert link.expires == DateTime.from_naive!(~N[2011-05-18T15:01:01Z], "Etc/UTC")
+    end
+
+    test "update_link/2 with invalid data returns error changeset" do
+      link = link_fixture()
+      assert {:error, %Ecto.Changeset{}} = Links.update_link(link, @invalid_attrs)
+      assert link == Links.get_link!(link.id)
+    end
+
+    test "delete_link/1 deletes the link" do
+      link = link_fixture()
+      assert {:ok, %Link{}} = Links.delete_link(link)
+      assert_raise Ecto.NoResultsError, fn -> Links.get_link!(link.id) end
+    end
+
+    test "change_link/1 returns a link changeset" do
+      link = link_fixture()
+      assert %Ecto.Changeset{} = Links.change_link(link)
+    end
+  end
+end