Hound
For browser automation and writing integration tests in Elixir.
Source, Documentation
Features
-
Can run multiple browser sessions simultaneously. See example.
-
Supports Selenium (Firefox, Chrome), ChromeDriver and PhantomJs.
-
Supports Javascript-heavy apps. Retries a few times before reporting error.
-
Implements the WebDriver Wire Protocol.
Internet Explorer may work under Selenium, but hasn't been tested.
Example
ExUnit example
defmodule HoundTest do
use ExUnit.Case
use Hound.Helpers
hound_session()
test "the truth", meta do
navigate_to("http://example.com/guestbook.html")
element = find_element(:name, "message")
fill_field(element, "Happy Birthday ~!")
submit_element(element)
assert page_title() == "Thank you"
end
end
Here's another simple browser-automation example.
Setup
Hound requires Elixir 1.0.4 or higher.
- Add dependency to your mix project
{:hound, "~> 1.0"}
- Start Hound in your
test/test_helper.exsfile before theExUnit.start()line:
Application.ensure_all_started(:hound)
ExUnit.start()
When you run mix test, Hound is automatically started. You'll need a webdriver server running, like Selenium Server or Chrome Driver. If you aren't sure what it is, then read this.
If you're using Phoenix
Ensure the server is started when your tests are run. In config/test.exs change the server option of your endpoint config to true:
config :hello_world_web, HelloWorldWeb.Endpoint,
http: [port: 4001],
server: true
Configure
To configure Hound, use your config/config.exs file or equivalent.
Example:
config :hound, driver: "phantomjs"
Usage
Add the following lines to your ExUnit test files.
# Import helpers
use Hound.Helpers
# Start hound session and destroy when tests are run
hound_session()
If you prefer to manually start and end sessions, use Hound.start_session and Hound.end_session in the setup and teardown blocks of your tests.
Helpers
The documentation pages include examples under each function.
The docs are at http://hexdocs.pm/hound.
More examples? Checkout Hound's own test cases
FAQ
Can I run multiple browser sessions simultaneously
Oh yeah ~! Here is an example.
If you are running PhantomJs, take a look at the Caveats section below.
Can I run tests async?
Yes.
The number of tests you can run async at any point in time, depends on the number of sessions that your webdriver can maintain at a time. For Selenium Standalone, there seems to be a default limit of 15 sessions. You can set ExUnit's async option to limit the number of tests to run parallelly.
Will Hound guarantee an isolated session per test?
Yes. A separate session is started for each test process.
PhantomJs caveats
PhantomJs is extremely fast, but there are certain caveats. It uses Ghostdriver for its webdriver server, which currently has unimplemented features or open issues.
- Cookie jar isn't separate for sessions - https://github.com/ariya/phantomjs/issues/11417
Which means all sessions share the same cookies. Make sure you rundelete_cookies()at the end of each test. - Isolated sessions were added to GhostDriver recently and are yet to land in a PhantomJs release.
- Javascript alerts aren't yet supported - https://github.com/detro/ghostdriver/issues/20.
Running tests
You need a webdriver in order to run tests. We recommend phantomjs but any can be used by setting the WEBDRIVER environment variable as shown below:
$ phantomjs --wd
$ WEBDRIVER=phantomjs mix test
Maintainers
- Akash Manohar (HashNuke)
- Daniel Perez (tuvistavie)
Customary proclamation...
Copyright © 2013-2015, Akash Manohar J, under the MIT License (basically, do whatever you want)