1 files changed, 102 insertions, 0 deletions
diff --git a/activesupport/test/queueing/test_queue_test.rb b/activesupport/test/queueing/test_queue_test.rb
new file mode 100644
index 0000000000..4c08314366
--- /dev/null
+++ b/activesupport/test/queueing/test_queue_test.rb
@@ -0,0 +1,102 @@
+require 'abstract_unit'
+require 'active_support/queueing'
+
+class TestQueueTest < ActiveSupport::TestCase
+  def setup
+    @queue = ActiveSupport::TestQueue.new
+  end
+
+  class ExceptionRaisingJob
+    def run
+      raise
+    end
+  end
+
+  def test_drain_raises
+    @queue.push ExceptionRaisingJob.new
+    assert_raises(RuntimeError) { @queue.drain }
+  end
+
+  def test_jobs
+    @queue.push 1
+    @queue.push 2
+    assert_equal [1,2], @queue.jobs
+  end
+
+  class EquivalentJob
+    def initialize
+      @initial_id = self.object_id
+    end
+
+    def run
+    end
+
+    def ==(other)
+      other.same_initial_id?(@initial_id)
+    end
+
+    def same_initial_id?(other_id)
+      other_id == @initial_id
+    end
+  end
+
+  def test_contents
+    assert @queue.empty?
+    job = EquivalentJob.new
+    @queue.push job
+    refute @queue.empty?
+    assert_equal job, @queue.pop
+  end
+
+  class ProcessingJob
+    def self.clear_processed
+      @processed = []
+    end
+
+    def self.processed
+      @processed
+    end
+
+    def initialize(object)
+      @object = object
+    end
+
+    def run
+      self.class.processed << @object
+    end
+  end
+
+  def test_order
+    ProcessingJob.clear_processed
+    job1 = ProcessingJob.new(1)
+    job2 = ProcessingJob.new(2)
+
+    @queue.push job1
+    @queue.push job2
+    @queue.drain
+
+    assert_equal [1,2], ProcessingJob.processed
+  end
+
+  class ThreadTrackingJob
+    attr_reader :thread_id
+
+    def run
+      @thread_id = Thread.current.object_id
+    end
+
+    def ran?
+      @thread_id
+    end
+  end
+
+  def test_drain
+    @queue.push ThreadTrackingJob.new
+    job = @queue.jobs.last
+    @queue.drain
+
+    assert @queue.empty?
+    assert job.ran?, "The job runs synchronously when the queue is drained"
+    assert_not_equal job.thread_id, Thread.current.object_id
+  end
+end