Waiting docker container to continue tests

[Samuel Mutel]

Hello,

I am currently using rspec and docker api to test docker container (@container = Docker::Container.create & @container.start).

I would like to know if it is possible to wait a condition (port available for example) to continue the test suite?

I saw this module rspec-wait ...

Thanks.

[Myron Marston]

RSpec doesn’t have any built-in features for what you’re asking for, but it’s easy enough to write it yourself:

require 'timeout'

module WaitHelpers
  def wait_until(timeout)
    timeout_time = Time.now + timeout
    loop do
      sleep 0.1
      return if yield
      raise Timeout::Error if Time.now > timeout_time
    end
  end

  def wait_until_port_available(container)
    wait_until(10) do
      container.port.available? # or whatever the logic to check port availability is
    end
  end
end

RSpec.configure do |rspec|
  rspec.include WaitHelpers
end

RSpec.describe "A docker container" do
  before do
    @container = Docker::Container.create
    @container.start
    wait_until_port_available(@container)
  end
end

​

HTH,

Myron

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