Add test for UserRegistrationHTML

Added test to cover the new.html registration form template.

This improves UserRegistrationHTML coverage from 0% to 100%.

test/towerops_web/controllers/user_registration_html_test.exs

@@ -0,0 +1,25 @@
+defmodule ToweropsWeb.UserRegistrationHTMLTest do
+  use ToweropsWeb.ConnCase, async: true
+
+  import Phoenix.Template, only: [render_to_string: 4]
+
+  alias Towerops.Accounts.User
+
+  describe "new.html" do
+    test "renders registration form" do
+      changeset = User.email_changeset(%User{}, %{})
+
+      html =
+        render_to_string(ToweropsWeb.UserRegistrationHTML, "new", "html",
+          flash: %{},
+          current_scope: nil,
+          changeset: changeset
+        )
+
+      assert html =~ "Register for an account"
+      assert html =~ "Already registered?"
+      assert html =~ "Log in"
+      assert html =~ "Create an account"
+    end
+  end
+end