testcontainers-elasticsearch simplifies the creation and management of ElasticSearch containers for testing purposes using the Testcontainers library.

Add the library to the test section in your application's Gemfile:

group :test do
  gem 'testcontainers-elasticsearch'
end

And then execute:

$ bundle install

Or install it yourself as:

$ gem install testcontainers-elasticsearch

To use the library, you first need to require it:

require "testcontainers/elasticsearch"

Create a new instance of the Testcontainers::ElasticsearchContainer class:

container = Testcontainers::ElasticsearchContainer.new

This creates a new container with the default Elasticsearch image. You can customize the image by passing an argument to the constructor:

container = Testcontainers::ElasticsearchContainer.new("elasticsearch:7.17.10")

Start the container:

container.start

Stop the container when you're done:

container.stop

Once the container is running, you can obtain the connection details using the following methods:

host = container.host
port = container.first_mapped_port

Or, you can generate the full Elasticsearch URL:

elasticsearch_url = container.elasticsearch_url

Use this URL to connect to the Elasticsearch container using your preferred Elasticsearch client library.

Here's a complete example of how to use testcontainers-elasticsearch to create a container, connect to it, and perform a simple health check:

require "testcontainers/elasticsearch"
require "elasticsearch"

container = Testcontainers::ElasticsearchContainer.new
container.start

client = Elasticsearch::Client.new(url: ccontainer.elasticsearch_url)
client.ping #=> true

container.stop

This example creates an Elasticsearch container, connects to it using the elasticsearch library, performs a simple ping, and then stops the container.

You can manage the container in the before(:suite) / after(:suite) blocks in your spec_helper.rb:

RSpec.configure do |config|
  # This helps us to have access to the `RSpec.configuration.elasticsearch_container` without using global variables.
  config.add_setting :elasticsearch_container, default: nil

  config.before(:suite) do
    config.elasticsearch_container = Testcontainers::ElasticsearchContainer.new.start
    ENV["ELASTICSEARCH_URL"] = config.elasticsearch_container.elasticsearch_url
  end

  config.after(:suite) do
    config.elasticsearch_container&.stop
    config.elasticsearch_container&.remove
  end
end

This code starts an Elasticsearch container before the test suite runs and stops it after the suite finishes. The Elasticsearch URL is stored in an environment variable, so it's accessible to the tests.

Bug reports and pull requests are welcome on GitHub at https://github.com/testcontainers/testcontainers-ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Testcontainers project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.