mix phx.gen.json test fail out of the box

Environment

Elixir version (elixir -v): Erlang/OTP 21 [erts-10.2.4] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [hipe] [dtrace] Elixir 1.8.1 (compiled with Erlang/OTP 21)
Phoenix version (mix deps):
connection 1.0.4 (Hex package) (mix) locked at 1.0.4 (connection) a1cae722 ok
gettext 0.16.1 (Hex package) (mix) locked at 0.16.1 (gettext) e2130b25 ok
ranch 1.7.1 (Hex package) (rebar3) locked at 1.7.1 (ranch) 6b1fab51 ok
telemetry 0.3.0 (Hex package) (rebar3) locked at 0.3.0 (telemetry) 099a7f3c ok
decimal 1.7.0 (Hex package) (mix) locked at 1.7.0 (decimal) 30d6b52c ok
jason 1.1.2 (Hex package) (mix) locked at 1.1.2 (jason) b03dedea ok
db_connection 2.0.5 (Hex package) (mix) locked at 2.0.5 (db_connection) ddb2ba67 ok
ecto 3.0.7 (Hex package) (mix) locked at 3.0.7 (ecto) 44dda84a ok
phoenix_pubsub 1.1.2 (Hex package) (mix) locked at 1.1.2 (phoenix_pubsub) 496c303b ok
cowlib 2.7.0 (Hex package) (rebar3) locked at 2.7.0 (cowlib) 3ef16e77 ok
cowboy 2.6.1 (Hex package) (rebar3) locked at 2.6.1 (cowboy) f2e06f75 ok
mime 1.3.1 (Hex package) (mix) locked at 1.3.1 (mime) 30ce04ab ok
postgrex 0.14.1 (Hex package) (mix) locked at 0.14.1 (postgrex) 63247d4a ok
ecto_sql 3.0.5 (Hex package) (mix) locked at 3.0.5 (ecto_sql) 7e44172b ok
plug_crypto 1.0.0 (Hex package) (mix) locked at 1.0.0 (plug_crypto) 18e49317 ok
plug 1.7.2 (Hex package) (mix) locked at 1.7.2 (plug) d7b7db7f ok
plug_cowboy 2.0.1 (Hex package) (mix) locked at 2.0.1 (plug_cowboy) d798f8ee ok
phoenix 1.4.1 (Hex package) (mix) locked at 1.4.1 (phoenix) 801f9d63 ok
phoenix_ecto 4.0.0 (Hex package) (mix) locked at 4.0.0 (phoenix_ecto) c43117a1 ok

Expected behavior

All tests to pass

Actual behavior


$ mix phx.new repro --no-html --binary-id --no-webpack
* creating repro/config/config.exs
* creating repro/config/dev.exs
* creating repro/config/prod.exs
* creating repro/config/prod.secret.exs
* creating repro/config/test.exs
* creating repro/lib/repro/application.ex
* creating repro/lib/repro.ex
* creating repro/lib/repro_web/channels/user_socket.ex
* creating repro/lib/repro_web/views/error_helpers.ex
* creating repro/lib/repro_web/views/error_view.ex
* creating repro/lib/repro_web/endpoint.ex
* creating repro/lib/repro_web/router.ex
* creating repro/lib/repro_web.ex
* creating repro/mix.exs
* creating repro/README.md
* creating repro/.formatter.exs
* creating repro/.gitignore
* creating repro/test/support/channel_case.ex
* creating repro/test/support/conn_case.ex
* creating repro/test/test_helper.exs
* creating repro/test/repro_web/views/error_view_test.exs
* creating repro/lib/repro_web/gettext.ex
* creating repro/priv/gettext/en/LC_MESSAGES/errors.po
* creating repro/priv/gettext/errors.pot
* creating repro/lib/repro/repo.ex
* creating repro/priv/repo/migrations/.formatter.exs
* creating repro/priv/repo/seeds.exs
* creating repro/test/support/data_case.ex

Fetch and install dependencies? [Yn] y
* running mix deps.get
* running mix deps.compile

We are almost there! The following steps are missing:

    $ cd repro

Then configure your database in config/dev.exs and run:

    $ mix ecto.create

Start your Phoenix app with:

    $ mix phx.server

You can also run your app inside IEx (Interactive Elixir) as:

    $ iex -S mix phx.server

$ cd repro
$ mix ecto.create
Compiling 10 files (.ex)
Generated repro app
The database for Repro.Repo has been created
$ mix phx.gen.json Accounts User users name:string age:integer
* creating lib/repro_web/controllers/user_controller.ex
* creating lib/repro_web/views/user_view.ex
* creating test/repro_web/controllers/user_controller_test.exs
* creating lib/repro_web/views/changeset_view.ex
* creating lib/repro_web/controllers/fallback_controller.ex
* creating lib/repro/accounts/user.ex
* creating priv/repo/migrations/20190308073600_create_users.exs
* creating lib/repro/accounts.ex
* injecting lib/repro/accounts.ex
* creating test/repro/accounts/accounts_test.exs
* injecting test/repro/accounts/accounts_test.exs

Add the resource to your :api scope in lib/repro_web/router.ex:

    resources "/users", UserController, except: [:new, :edit]

Remember to update your repository by running migrations:

    $ mix ecto.migrate

$ mix ecto.migrate
Compiling 6 files (.ex)
warning: function ReproWeb.Router.Helpers.user_path/3 is undefined or private
  lib/repro_web/controllers/user_controller.ex:18

Generated repro app
[info] == Running 20190308073600 Repro.Repo.Migrations.CreateUsers.change/0 forward
[info] create table users
[info] == Migrated 20190308073600 in 0.0s
$ mix test
==> connection
Compiling 1 file (.ex)
Generated connection app
==> gettext
Compiling 1 file (.erl)
Compiling 20 files (.ex)
Generated gettext app
===> Compiling ranch
===> Compiling telemetry
==> decimal
Compiling 1 file (.ex)
Generated decimal app
==> jason
Compiling 8 files (.ex)
Generated jason app
==> db_connection
Compiling 16 files (.ex)
Generated db_connection app
==> ecto
Compiling 54 files (.ex)
Generated ecto app
==> phoenix_pubsub
Compiling 13 files (.ex)
Generated phoenix_pubsub app
===> Compiling cowlib
===> Compiling cowboy
==> mime
Compiling 2 files (.ex)
Generated mime app
==> postgrex
Compiling 61 files (.ex)
Generated postgrex app
==> ecto_sql
Compiling 23 files (.ex)
Generated ecto_sql app
==> plug_crypto
Compiling 4 files (.ex)
Generated plug_crypto app
==> plug
Compiling 1 file (.erl)
Compiling 38 files (.ex)
warning: System.stacktrace/0 outside of rescue/catch clauses is deprecated. If you want to support only Elixir v1.7+, you must access __STACKTRACE__ inside a rescue/catch. If you want to support earlier Elixir versions, move System.stacktrace/0 inside a rescue/catch
  lib/plug/conn/wrapper_error.ex:23

Generated plug app
==> plug_cowboy
Compiling 5 files (.ex)
Generated plug_cowboy app
==> phoenix
Compiling 67 files (.ex)
warning: function Phoenix.HTML.Safe.to_iodata/1 is undefined (module Phoenix.HTML.Safe is not available)
  lib/phoenix/template/html.ex:14

Generated phoenix app
==> phoenix_ecto
Compiling 6 files (.ex)
Generated phoenix_ecto app
==> repro
Compiling 19 files (.ex)
warning: function ReproWeb.Router.Helpers.user_path/3 is undefined or private
  lib/repro_web/controllers/user_controller.ex:18

Generated repro app
..........

  1) test delete user deletes chosen user (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:78
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/3 is undefined or private
     code: conn = delete(conn, Routes.user_path(conn, :delete, user))
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2753.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :delete, %Repro.Accounts.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, age: 42, id: "520108c6-81f6-4130-8f04-511093cab71c", inserted_at: ~N[2019-03-08 07:36:20], name: "some name", updated_at: ~N[2019-03-08 07:36:20]})
       test/repro_web/controllers/user_controller_test.exs:79: (test)

  2) test create user renders errors when data is invalid (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:47
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/2 is undefined or private
     code: conn = post(conn, Routes.user_path(conn, :create), user: @invalid_attrs)
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2755.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :create)
       test/repro_web/controllers/user_controller_test.exs:48: (test)

  3) test update user renders errors when data is invalid (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:69
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/3 is undefined or private
     code: conn = put(conn, Routes.user_path(conn, :update, user), user: @invalid_attrs)
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2757.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :update, %Repro.Accounts.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, age: 42, id: "276c8ec3-39ca-4d71-bb6d-45c2ea053c1e", inserted_at: ~N[2019-03-08 07:36:20], name: "some name", updated_at: ~N[2019-03-08 07:36:20]})
       test/repro_web/controllers/user_controller_test.exs:70: (test)

  4) test index lists all users (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:27
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/2 is undefined or private
     code: conn = get(conn, Routes.user_path(conn, :index))
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2759.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :index)
       test/repro_web/controllers/user_controller_test.exs:28: (test)

  5) test update user renders user when data is valid (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:56
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/3 is undefined or private
     code: conn = put(conn, Routes.user_path(conn, :update, user), user: @update_attrs)
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2761.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :update, %Repro.Accounts.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, age: 42, id: "17a31394-023b-4734-88dd-966ce7eaa393", inserted_at: ~N[2019-03-08 07:36:20], name: "some name", updated_at: ~N[2019-03-08 07:36:20]})
       test/repro_web/controllers/user_controller_test.exs:57: (test)

  6) test create user renders user when data is valid (ReproWeb.UserControllerTest)
     test/repro_web/controllers/user_controller_test.exs:34
     ** (UndefinedFunctionError) function ReproWeb.Router.Helpers.user_path/2 is undefined or private
     code: conn = post(conn, Routes.user_path(conn, :create), user: @create_attrs)
     stacktrace:
       (repro) ReproWeb.Router.Helpers.user_path(%Plug.Conn{adapter: {Plug.Adapters.Test.Conn, :...}, assigns: %{}, before_send: [], body_params: %Plug.Conn.Unfetched{aspect: :body_params}, cookies: %Plug.Conn.Unfetched{aspect: :cookies}, halted: false, host: "www.example.com", method: "GET", owner: #PID<0.2763.0>, params: %Plug.Conn.Unfetched{aspect: :params}, path_info: [], path_params: %{}, port: 80, private: %{phoenix_recycled: true, plug_skip_csrf_protection: true}, query_params: %Plug.Conn.Unfetched{aspect: :query_params}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %Plug.Conn.Unfetched{aspect: :cookies}, req_headers: [{"accept", "application/json"}], request_path: "/", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}], scheme: :http, script_name: [], secret_key_base: nil, state: :unset, status: nil}, :create)
       test/repro_web/controllers/user_controller_test.exs:35: (test)

Finished in 0.1 seconds
16 tests, 6 failures

Randomized with seed 448344```

phoenixframework / phoenix

mix phx.gen.json test fail out of the box #3305

Environment

Expected behavior

Actual behavior