test for :phoenix_controller_render instrumenter

test/prometheus_phoenix_test.exs

@@ -22,20 +22,38 @@ defmodule PrometheusPhoenixTest do
   test "Default config" do
     conn = get build_conn(), "/qwe"
     assert html_response(conn, 200) =~ "qwe"
-    assert {buckets, sum} = Histogram.value([name: :phoenix_controller_call_duration_microseconds,
-                                             labels: ["PrometheusPhoenixTest.Controller", :qwe]])
-    assert (sum > 1000000 and sum < 1200000)
+    assert {buckets, sum} =
+      Histogram.value([name: :phoenix_controller_call_duration_microseconds,
+                       labels: ["PrometheusPhoenixTest.Controller", :qwe]])
+    assert (sum > 1_000_000 and sum < 1_200_000)
     assert 1 = Enum.reduce(buckets, fn(x, acc) -> x + acc end)
   end
 
   test "Custom config" do
     conn = get build_conn(), "/qwe"
     assert html_response(conn, 200) =~ "qwe"
-    assert {buckets, sum} = Histogram.value([name: :phoenix_controller_call_duration_seconds,
-                                             labels: ["PrometheusPhoenixTest.Controller", "custom_label"],
-                                             registry: :qwe])
+    assert {buckets, sum} =
+      Histogram.value([name: :phoenix_controller_call_duration_seconds,
+                       labels: ["PrometheusPhoenixTest.Controller", "custom_label"],
+                       registry: :qwe])
     assert (sum > 1 and sum < 1.2)
     assert 3 = length(buckets)
     assert 1 = Enum.reduce(buckets, fn(x, acc) -> x + acc end)
   end
+
+  test "Default config view" do
+    conn = get build_conn(), "/qwe_view"
+    assert html_response(conn, 200) =~ "Hello John Doe"
+    assert {buckets, sum} =
+      Histogram.value([name: :phoenix_controller_call_duration_microseconds,
+                       labels: ["PrometheusPhoenixTest.Controller", :qwe_view]])
+    assert (sum > 1_000_000 and sum < 1_200_000)
+    assert 1 = Enum.reduce(buckets, fn(x, acc) -> x + acc end)
+
+    assert {buckets, sum} =
+      Histogram.value([name: :phoenix_controller_render_duration_microseconds,
+                       labels: [PrometheusPhoenixTest.View, "qwe_view.html", "html"]])
+    assert (sum > 0 and sum < 100_000)
+    assert 1 = Enum.reduce(buckets, fn(x, acc) -> x + acc end)
+  end
 end

test/templates/qwe_view.html.eex

@@ -0,0 +1 @@
+Hello <%= @name %>

test/test_helper.exs

@@ -1,4 +1,6 @@
 ExUnit.start()
+:application.ensure_all_started(:plug)
+:application.ensure_all_started(:phoenix)
 
 Application.put_env(:phoenix, PrometheusPhoenixTest.Endpoint,
   [instrumenters: [TestPhoenixInstrumenter,
@@ -26,13 +28,18 @@ end
 defmodule PrometheusPhoenixTest.Router do
   use Phoenix.Router
   get "/qwe", PrometheusPhoenixTest.Controller, :qwe
+  get "/qwe_view", PrometheusPhoenixTest.Controller, :qwe_view
 end
 
 defmodule PrometheusPhoenixTest.Endpoint do
   use Phoenix.Endpoint, otp_app: :phoenix
   plug PrometheusPhoenixTest.Router
 end
 
+defmodule PrometheusPhoenixTest.View do
+  use Phoenix.View, root: "test/templates"
+end
+
 defmodule PrometheusPhoenixTest.Controller do
   use Phoenix.Controller
 
@@ -42,6 +49,11 @@ defmodule PrometheusPhoenixTest.Controller do
     |> put_resp_content_type("text/html")
     |> send_resp(200, "qwe")
   end
+
+  def qwe_view(conn, _params) do
+    Process.sleep(1000)
+    render(conn, PrometheusPhoenixTest.View, "qwe_view.html", name: "John Doe", layout: false)
+  end
 end
 
 PrometheusPhoenixTest.Endpoint.start_link