executors_spec.rb

require File.dirname(__FILE__) + "/../spec_helper"

TEST_VALUE = 101

class MyCallableTask
  include java.util.concurrent.Callable
  
  def call
    sleep 2
    TEST_VALUE
  end
  
end

describe "java.util.concurrent.Executors" do
  before do
    @executor = java.util.concurrent.Executors.newSingleThreadExecutor
    @future_callable = @executor.submit(MyCallableTask.new)
  end
  
  it "expects a class that implements Callable interface" do
    @future.get.should == TEST_VALUE
  end
  
  after do
    @executor.shutdown
  end
  
end

test_java_callable.rb

require 'test/unit'
require 'java'

TEST_VALUE = 101

class MyTask
  include java.util.concurrent.Callable

  def call
    sleep 2
    TEST_VALUE
  end
end

class TestJavaCallable < Test::Unit::TestCase

  def setup
    @executor = java.util.concurrent.Executors.newSingleThreadExecutor

    @future = @executor.submit(MyTask.new)
  end

  def test_call
    assert @future.get == TEST_VALUE
  end

  def teardown
    @executor.shutdown
  end

end