Provide metrics on root URL

test/kafkaex_lag_exporter_web/views/error_view_test.exs

@@ -0,0 +1,17 @@
+defmodule KafkaexLagExporterWeb.ErrorViewTest do
+  use KafkaexLagExporterWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.json" do
+    assert render(KafkaexLagExporterWeb.ErrorView, "404.json", []) == %{
+             errors: %{detail: "Not Found"}
+           }
+  end
+
+  test "renders 500.json" do
+    assert render(KafkaexLagExporterWeb.ErrorView, "500.json", []) ==
+             %{errors: %{detail: "Internal Server Error"}}
+  end
+end