Pass a variable that is needed to template

lib/tilex_web/controllers/post_controller.ex

@@ -171,7 +171,7 @@ defmodule TilexWeb.PostController do
         |> redirect(to: post_path(conn, :show, post))
 
       {:error, changeset} ->
-        render(conn, "edit.html", post: post, changeset: changeset)
+        render(conn, "edit.html", post: post, changeset: changeset, current_user: current_user)
     end
   end
 

test/features/admin_edits_post_test.exs

@@ -30,4 +30,27 @@ defmodule AdminEditsPostTest do
     session
     |> PostShowPage.ensure_page_loaded("Even Awesomer Post!")
   end
+
+  test "enters a title that is too long", %{session: session} do
+    Factory.insert!(:channel, name: "phoenix")
+    developer = Factory.insert!(:developer)
+
+    post =
+      Factory.insert!(
+        :post,
+        title: "Limited characters",
+        developer: developer,
+        body: "Bugs revealed"
+      )
+
+    session
+    |> sign_in(developer)
+    |> PostForm.navigate(post)
+    |> PostForm.ensure_page_loaded()
+    |> PostForm.fill_in_title(String.duplicate("I can codez ", 10))
+    |> PostForm.click_submit()
+
+    session
+    |> PostForm.expect_form_has_error("Title should be at most 50 character(s)")
+  end
 end

test/support/pages/post_form.ex

@@ -70,4 +70,11 @@ defmodule Tilex.Integration.Pages.PostForm do
     session
     |> click(Query.button("Submit"))
   end
+
+  def expect_form_has_error(session, error_text) do
+    session
+    |> assert_has(Query.css("form", text: error_text))
+
+    session
+  end
 end