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Programming language: Elixir
License: Apache License 2.0
Tags: Testing    

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Plug Test Helpers

Simple helpers to test your Plugs with ExUnit. Still an experiment in progress at this point.

The library provides a set of macros which can perform assertions on Plug.Conn structs to verify the response status, headers and body.


Add the dependency in your mix.exs file:

def deps do
  [ { :plug_test_helpers, "~> 0.1" } ]

After you are done, run mix deps.get in your shell to get install it.


Add use PlugTestHelpers to your test case to bring in new Plug-specific assert macros :

defmodule do
  use ExUnit.Case, async: true

  use Plug.Test
  use PlugTestHelpers

  @opts MyPlug.init([])

  test "status" do
    conn = conn(:get, "/")
    conn = MyPlug.call(conn, @opts)
    assert_status 200

  test "404" do
    conn = conn(:get, "/not-found")
    conn = MyPlug.call(conn, @opts)
    # Works with symbols toos
    assert_status :not_found

  test "redirect" do
    conn = conn(:get, "/redirect")
    conn = MyPlug.call(conn, @opts)
    # Will check both HTTP status code and header
    assert_redirect "http://example.com"

  test "headers" do
    conn = conn(:get, "/image.jpg")
    conn = MyPlug.call(conn, @opts)
    # Will pass if the header is present
    assert_header "content_type"
    # Will pass if the header value is set to the given string
    assert_header "content_type", "image/jpg"
    # Will pass if the header value matches the given regex
    assert_header_match "content_type", ~r/\Aimage\/jpe?g\Z/

  test "body" do
    conn = conn(:get, "/")
    conn = MyPlug.call(conn, @opts)
    # Will pass if the response body is the given string
    assert_body "complete response text"
    # Will pass if the response body matches the given regex
    assert_body_match ~r/complete/


Current Design Decisions

Things may always change but these are the current design decisions taken to build this library.

Convention over Configuration

Each of the assert macros expect a variable named conn to be bound to a Plug.Conn.

This is definitely a questionable design decision and I'd be very happy ot get some feedback about this.

I think it's nice to have tests that are simple and concise. Is it worth providing macros accepting an extra conn parameter?

Advanced Response Body Assertions

Assertions to match against structured response content (such as HTML or JSON) are currently out of the scope of this library.


Copyright 2014 Xavier Defrang

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

*Note that all licence references and agreements mentioned in the plug_test_helpers README section above are relevant to that project's source code only.