module EcsWeb.Router.Helpers is not loaded and could not be found

[Bastes]

Tinkering with espec_phoenix with the latest phoenix version I'm finding these annoying errors that I can't seem to fathom when I run my specs for a simple controller test (copy-pasted-adapted from the pre-built phoenix tests):

== Compilation error in file spec/ecs_web/controllers/error_html_spec.exs ==
** (CompileError) spec/ecs_web/controllers/error_html_spec.exs:2: module EcsWeb.Router.Helpers is not loaded and could not be found
    expanding macro: ESpec.Phoenix.Extend.__using__/1
    spec/ecs_web/controllers/error_html_spec.exs:2: EcsWeb.ErrorHTMLSpec (module)
    (elixir 1.14.0) expanding macro: Kernel.use/2
    spec/ecs_web/controllers/error_html_spec.exs:2: EcsWeb.ErrorHTMLSpec (module)
    (espec_phoenix 0.8.2) expanding macro: ESpec.Phoenix.__using__/1

(my app being named Ecs)

Versions:

❯ asdf current
elixir          1.14.0-otp-24   /Users/michel.belleville/.tool-versions
erlang          24.3.4.16       /Users/michel.belleville/.tool-versions

❯ cat mix.exs
defmodule Ecs.MixProject do
...
  defp deps do
    [
      {:phoenix, "~> 1.7.11"},
      {:phoenix_html, "~> 4.0"},
      {:phoenix_live_reload, "~> 1.2", only: :dev},
      {:phoenix_live_view, "~> 0.20.2"},
      {:floki, ">= 0.30.0", only: :test},
      {:phoenix_live_dashboard, "~> 0.8.3"},
      {:esbuild, "~> 0.8", runtime: Mix.env() == :dev},
      {:tailwind, "~> 0.2", runtime: Mix.env() == :dev},
      {:heroicons,
       github: "tailwindlabs/heroicons",
       tag: "v2.1.1",
       sparse: "optimized",
       app: false,
       compile: false,
       depth: 1},
      {:swoosh, "~> 1.5"},
      {:finch, "~> 0.13"},
      {:telemetry_metrics, "~> 0.6"},
      {:telemetry_poller, "~> 1.0"},
      {:gettext, "~> 0.20"},
      {:jason, "~> 1.2"},
      {:dns_cluster, "~> 0.1.1"},
      {:bandit, "~> 1.2"},
      {:espec_phoenix, "~> 0.8.2", only: :test},
      {:mix_test_watch, "~> 1.0", only: [:dev, :test], runtime: false}
    ]
  end
...
end

❯ cat mix.lock
%{
  "bandit": {:hex, :bandit, "1.3.0", "6a4e8d7c9ea721edd02c389e2cc867890cd96f83116e71ddf1ccbdd80661550c", [:mix], [{:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:thousand_island, "~> 1.0", [hex: :thousand_island, repo: "hexpm", optional: false]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "bda37d6c614d74778a5dc43b8bcdc3245cd30619eab0342f58042f968f2165da"},
  "castore": {:hex, :castore, "1.0.5", "9eeebb394cc9a0f3ae56b813459f990abb0a3dedee1be6b27fdb50301930502f", [:mix], [], "hexpm", "8d7c597c3e4a64c395980882d4bca3cebb8d74197c590dc272cfd3b6a6310578"},
  "dns_cluster": {:hex, :dns_cluster, "0.1.3", "0bc20a2c88ed6cc494f2964075c359f8c2d00e1bf25518a6a6c7fd277c9b0c66", [:mix], [], "hexpm", "46cb7c4a1b3e52c7ad4cbe33ca5079fbde4840dedeafca2baf77996c2da1bc33"},
  "esbuild": {:hex, :esbuild, "0.8.1", "0cbf919f0eccb136d2eeef0df49c4acf55336de864e63594adcea3814f3edf41", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}, {:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "25fc876a67c13cb0a776e7b5d7974851556baeda2085296c14ab48555ea7560f"},
  "espec": {:hex, :espec, "1.9.2", "274e501b7807c2281350fb0ff4c9610764971ca11182cd9fbd0c78159ba99902", [:mix], [{:meck, "~> 0.9", [hex: :meck, repo: "hexpm", optional: false]}], "hexpm", "934df18183486d1e4f46c477e9752c9aa1964d9b514b1b8f250d2e8e18511ce5"},
  "espec_phoenix": {:hex, :espec_phoenix, "0.8.2", "d2cc779d7f6e99991448d20dd1a4040a73653c1420badfd70ba1f9c8dbf0515d", [:mix], [{:espec, ">= 1.8.0", [hex: :espec, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.6", [hex: :phoenix, repo: "hexpm", optional: false]}, {:phoenix_live_view, "~> 0.17", [hex: :phoenix_live_view, repo: "hexpm", optional: false]}, {:poison, "~> 5.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm", "2684c949c2b705dceb0b6131188761c447028f459f8bb3cb945a88d8298fc740"},
  "expo": {:hex, :expo, "0.5.2", "beba786aab8e3c5431813d7a44b828e7b922bfa431d6bfbada0904535342efe2", [:mix], [], "hexpm", "8c9bfa06ca017c9cb4020fabe980bc7fdb1aaec059fd004c2ab3bff03b1c599c"},
  "file_system": {:hex, :file_system, "1.0.0", "b689cc7dcee665f774de94b5a832e578bd7963c8e637ef940cd44327db7de2cd", [:mix], [], "hexpm", "6752092d66aec5a10e662aefeed8ddb9531d79db0bc145bb8c40325ca1d8536d"},
  "finch": {:hex, :finch, "0.18.0", "944ac7d34d0bd2ac8998f79f7a811b21d87d911e77a786bc5810adb75632ada4", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6 or ~> 1.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "69f5045b042e531e53edc2574f15e25e735b522c37e2ddb766e15b979e03aa65"},
  "floki": {:hex, :floki, "0.36.0", "544d5dd8a3107f660633226b5805e47c2ac1fabd782fae86e3b22b02849b20f9", [:mix], [], "hexpm", "ab1ca4b1efb0db00df9a8e726524e2c85be88cf65ac092669186e1674d34d74c"},
  "gettext": {:hex, :gettext, "0.24.0", "6f4d90ac5f3111673cbefc4ebee96fe5f37a114861ab8c7b7d5b30a1108ce6d8", [:mix], [{:expo, "~> 0.5.1", [hex: :expo, repo: "hexpm", optional: false]}], "hexpm", "bdf75cdfcbe9e4622dd18e034b227d77dd17f0f133853a1c73b97b3d6c770e8b"},
  "heroicons": {:git, "https://github.com/tailwindlabs/heroicons.git", "88ab3a0d790e6a47404cba02800a6b25d2afae50", [tag: "v2.1.1", sparse: "optimized"]},
  "hpax": {:hex, :hpax, "0.1.2", "09a75600d9d8bbd064cdd741f21fc06fc1f4cf3d0fcc335e5aa19be1a7235c84", [:mix], [], "hexpm", "2c87843d5a23f5f16748ebe77969880e29809580efdaccd615cd3bed628a8c13"},
  "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
  "meck": {:hex, :meck, "0.9.2", "85ccbab053f1db86c7ca240e9fc718170ee5bda03810a6292b5306bf31bae5f5", [:rebar3], [], "hexpm", "81344f561357dc40a8344afa53767c32669153355b626ea9fcbc8da6b3045826"},
  "mime": {:hex, :mime, "2.0.5", "dc34c8efd439abe6ae0343edbb8556f4d63f178594894720607772a041b04b02", [:mix], [], "hexpm", "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c"},
  "mint": {:hex, :mint, "1.5.2", "4805e059f96028948870d23d7783613b7e6b0e2fb4e98d720383852a760067fd", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "d77d9e9ce4eb35941907f1d3df38d8f750c357865353e21d335bdcdf6d892a02"},
  "mix_test_watch": {:hex, :mix_test_watch, "1.2.0", "1f9acd9e1104f62f280e30fc2243ae5e6d8ddc2f7f4dc9bceb454b9a41c82b42", [:mix], [{:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "278dc955c20b3fb9a3168b5c2493c2e5cffad133548d307e0a50c7f2cfbf34f6"},
  "nimble_options": {:hex, :nimble_options, "1.1.0", "3b31a57ede9cb1502071fade751ab0c7b8dbe75a9a4c2b5bbb0943a690b63172", [:mix], [], "hexpm", "8bbbb3941af3ca9acc7835f5655ea062111c9c27bcac53e004460dfd19008a99"},
  "nimble_pool": {:hex, :nimble_pool, "1.0.0", "5eb82705d138f4dd4423f69ceb19ac667b3b492ae570c9f5c900bb3d2f50a847", [:mix], [], "hexpm", "80be3b882d2d351882256087078e1b1952a28bf98d0a287be87e4a24a710b67a"},
  "phoenix": {:hex, :phoenix, "1.7.11", "1d88fc6b05ab0c735b250932c4e6e33bfa1c186f76dcf623d8dd52f07d6379c7", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.1", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:phoenix_template, "~> 1.0", [hex: :phoenix_template, repo: "hexpm", optional: false]}, {:phoenix_view, "~> 2.0", [hex: :phoenix_view, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.7", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:websock_adapter, "~> 0.5.3", [hex: :websock_adapter, repo: "hexpm", optional: false]}], "hexpm", "b1ec57f2e40316b306708fe59b92a16b9f6f4bf50ccfa41aa8c7feb79e0ec02a"},
  "phoenix_html": {:hex, :phoenix_html, "4.1.1", "4c064fd3873d12ebb1388425a8f2a19348cef56e7289e1998e2d2fa758aa982e", [:mix], [], "hexpm", "f2f2df5a72bc9a2f510b21497fd7d2b86d932ec0598f0210fed4114adc546c6f"},
  "phoenix_live_dashboard": {:hex, :phoenix_live_dashboard, "0.8.3", "7ff51c9b6609470f681fbea20578dede0e548302b0c8bdf338b5a753a4f045bf", [:mix], [{:ecto, "~> 3.6.2 or ~> 3.7", [hex: :ecto, repo: "hexpm", optional: true]}, {:ecto_mysql_extras, "~> 0.5", [hex: :ecto_mysql_extras, repo: "hexpm", optional: true]}, {:ecto_psql_extras, "~> 0.7", [hex: :ecto_psql_extras, repo: "hexpm", optional: true]}, {:ecto_sqlite3_extras, "~> 1.1.7 or ~> 1.2.0", [hex: :ecto_sqlite3_extras, repo: "hexpm", optional: true]}, {:mime, "~> 1.6 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:phoenix_live_view, "~> 0.19 or ~> 1.0", [hex: :phoenix_live_view, repo: "hexpm", optional: false]}, {:telemetry_metrics, "~> 0.6 or ~> 1.0", [hex: :telemetry_metrics, repo: "hexpm", optional: false]}], "hexpm", "f9470a0a8bae4f56430a23d42f977b5a6205fdba6559d76f932b876bfaec652d"},
  "phoenix_live_reload": {:hex, :phoenix_live_reload, "1.5.1", "6ab463cf43938ee9906067b33c8d66782343de4280a70084cd5617accc6345a8", [:mix], [{:file_system, "~> 0.3 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.4", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm", "e8467d308b61f294f68afe12c81bf585584c7ceed40ec8adde88ec176d480a78"},
  "phoenix_live_view": {:hex, :phoenix_live_view, "0.20.12", "3f4b5849b8018023c01e41a7da2e6c986222cc3f0282858f8af11221638645cb", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix, "~> 1.6.15 or ~> 1.7.0", [hex: :phoenix, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 3.3 or ~> 4.0", [hex: :phoenix_html, repo: "hexpm", optional: false]}, {:phoenix_template, "~> 1.0", [hex: :phoenix_template, repo: "hexpm", optional: false]}, {:phoenix_view, "~> 2.0", [hex: :phoenix_view, repo: "hexpm", optional: true]}, {:plug, "~> 1.15", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.2 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "ae3a143cc33325f3a4c192b7da1726e6665e154c50e1461af4cd7d561ccfd9ab"},
  "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.1.3", "3168d78ba41835aecad272d5e8cd51aa87a7ac9eb836eabc42f6e57538e3731d", [:mix], [], "hexpm", "bba06bc1dcfd8cb086759f0edc94a8ba2bc8896d5331a1e2c2902bf8e36ee502"},
  "phoenix_template": {:hex, :phoenix_template, "1.0.4", "e2092c132f3b5e5b2d49c96695342eb36d0ed514c5b252a77048d5969330d639", [:mix], [{:phoenix_html, "~> 2.14.2 or ~> 3.0 or ~> 4.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}], "hexpm", "2c0c81f0e5c6753faf5cca2f229c9709919aba34fab866d3bc05060c9c444206"},
  "plug": {:hex, :plug, "1.15.3", "712976f504418f6dff0a3e554c40d705a9bcf89a7ccef92fc6a5ef8f16a30a97", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "cc4365a3c010a56af402e0809208873d113e9c38c401cabd88027ef4f5c01fd2"},
  "plug_crypto": {:hex, :plug_crypto, "2.0.0", "77515cc10af06645abbfb5e6ad7a3e9714f805ae118fa1a70205f80d2d70fe73", [:mix], [], "hexpm", "53695bae57cc4e54566d993eb01074e4d894b65a3766f1c43e2c61a1b0f45ea9"},
  "poison": {:hex, :poison, "5.0.0", "d2b54589ab4157bbb82ec2050757779bfed724463a544b6e20d79855a9e43b24", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "11dc6117c501b80c62a7594f941d043982a1bd05a1184280c0d9166eb4d8d3fc"},
  "swoosh": {:hex, :swoosh, "1.15.3", "5c3f05b6e4e08cd4f75ad7e90db3c2b73c9d9de00503cce36a694951c2d69185", [:mix], [{:bandit, ">= 1.0.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:cowboy, "~> 1.1 or ~> 2.4", [hex: :cowboy, repo: "hexpm", optional: true]}, {:ex_aws, "~> 2.1", [hex: :ex_aws, repo: "hexpm", optional: true]}, {:finch, "~> 0.6", [hex: :finch, repo: "hexpm", optional: true]}, {:gen_smtp, "~> 0.13 or ~> 1.0", [hex: :gen_smtp, repo: "hexpm", optional: true]}, {:hackney, "~> 1.9", [hex: :hackney, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mail, "~> 0.2", [hex: :mail, repo: "hexpm", optional: true]}, {:mime, "~> 1.1 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: true]}, {:plug_cowboy, ">= 1.0.0", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:req, "~> 0.4 or ~> 1.0", [hex: :req, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.2 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "97a667b96ca8cc48a4679f6cd1f40a36d8701cf052587298473614caa70f164a"},
  "tailwind": {:hex, :tailwind, "0.2.2", "9e27288b568ede1d88517e8c61259bc214a12d7eed271e102db4c93fcca9b2cd", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}], "hexpm", "ccfb5025179ea307f7f899d1bb3905cd0ac9f687ed77feebc8f67bdca78565c4"},
  "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
  "telemetry_metrics": {:hex, :telemetry_metrics, "0.6.2", "2caabe9344ec17eafe5403304771c3539f3b6e2f7fb6a6f602558c825d0d0bfb", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "9b43db0dc33863930b9ef9d27137e78974756f5f198cae18409970ed6fa5b561"},
  "telemetry_poller": {:hex, :telemetry_poller, "1.0.0", "db91bb424e07f2bb6e73926fcafbfcbcb295f0193e0a00e825e589a0a47e8453", [:rebar3], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "b3a24eafd66c3f42da30fc3ca7dda1e9d546c12250a2d60d7b81d264fbec4f6e"},
  "thousand_island": {:hex, :thousand_island, "1.3.5", "6022b6338f1635b3d32406ff98d68b843ba73b3aa95cfc27154223244f3a6ca5", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2be6954916fdfe4756af3239fb6b6d75d0b8063b5df03ba76fd8a4c87849e180"},
  "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},
  "websock_adapter": {:hex, :websock_adapter, "0.5.5", "9dfeee8269b27e958a65b3e235b7e447769f66b5b5925385f5a569269164a210", [:mix], [{:bandit, ">= 0.6.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.6", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "4b977ba4a01918acbf77045ff88de7f6972c2a009213c515a445c48f224ffce9"},
}

The spec:

defmodule EcsWeb.ErrorHTMLSpec do
  use ESpec.Phoenix, controller: true

  it "renders 404.html" do
    expect(true) |> to(be_true())
    # deactivated to test whether it was something in the assertion that was bugging
    # expect(render_to_string(EcsWeb.ErrorHTML, "404", "html", [])) |> to(be("Not Found"))
  end
end

From what I understand it's something to do with the EcsWeb.Router.Helpers somehow not being defined at the time the ESpec.Phoenix.Extend.__using__/1 macro expects it, but why it's not is currently out of my grasp. I'll be happy to provide more details if I can :)

[eivhys]

Hello! I had this exact issue and I found this post on the elixir forums, seems the helpers have to be enabled explicitly in phoenix 1.7. TL;DR: MyApp.Router.Helpers can be enabled in the MyAppWeb module, change the use Phoenix.Router, helpers: false line to use Phoenix.Router, helpers: true and the MyApp.Router.Helpers module becomes available for ESpec.