Add bin and edit workflow

bin/gems/eventmachine-1.2.7/tests/test_futures.rb

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+require 'em_test_helper'
+
+class TestFutures < Test::Unit::TestCase
+
+  def setup
+  end
+
+  def teardown
+  end
+
+  def test_future
+      assert_equal(100, EM::Deferrable.future(100) )
+
+      p1 = proc { 100 + 1 }
+      assert_equal(101, EM::Deferrable.future(p1) )
+  end
+
+  class MyFuture
+      include EM::Deferrable
+      def initialize *args
+        super
+        set_deferred_status :succeeded, 40
+      end
+  end
+
+  class MyErrorFuture
+      include EM::Deferrable
+      def initialize *args
+        super
+        set_deferred_status :failed, 41
+      end
+  end
+
+
+  def test_future_1
+      # Call future with one additional argument and it will be treated as a callback.
+      def my_future
+        MyFuture.new
+      end
+
+      value = nil
+      EM::Deferrable.future my_future, proc {|v| value=v}
+      assert_equal( 40, value )
+  end
+
+
+  def test_future_2
+      # Call future with two additional arguments and they will be treated as a callback
+      # and an errback.
+      value = nil
+      EM::Deferrable.future MyErrorFuture.new, nil, proc {|v| value=v}
+      assert_equal( 41, value )
+  end
+
+
+  def test_future_3
+      # Call future with no additional arguments but with a block, and the block will be
+      # treated as a callback.
+      value = nil
+      EM::Deferrable.future MyFuture.new do |v|
+        value=v
+      end
+      assert_equal( 40, value )
+  end
+
+
+  class RecursiveCallback
+      include EM::Deferrable
+  end
+
+  # A Deferrable callback can call #set_deferred_status to change the values
+  # passed to subsequent callbacks.
+  #
+  def test_recursive_callbacks
+      n = 0 # counter assures that all the tests actually run.
+      rc = RecursiveCallback.new
+      rc.callback {|a|
+        assert_equal(100, a)
+        n += 1
+        rc.set_deferred_status :succeeded, 101, 101
+      }
+      rc.callback {|a,b|
+        assert_equal(101, a)
+        assert_equal(101, b)
+        n += 1
+        rc.set_deferred_status :succeeded, 102, 102, 102
+      }
+      rc.callback {|a,b,c|
+        assert_equal(102, a)
+        assert_equal(102, b)
+        assert_equal(102, c)
+        n += 1
+      }
+      rc.set_deferred_status :succeeded, 100
+      assert_equal(3, n)
+  end
+
+  def test_syntactic_sugar
+    rc = RecursiveCallback.new
+    rc.set_deferred_success 100
+    rc.set_deferred_failure 200
+  end
+
+  # It doesn't raise an error to set deferred status more than once.
+  # In fact, this is a desired and useful idiom when it happens INSIDE
+  # a callback or errback.
+  # However, it's less useful otherwise, and in fact would generally be
+  # indicative of a programming error. However, we would like to be resistant
+  # to such errors. So whenever we set deferred status, we also clear BOTH
+  # stacks of handlers.
+  #
+  def test_double_calls
+    s = 0
+    e = 0
+
+    d = EM::DefaultDeferrable.new
+    d.callback {s += 1}
+    d.errback {e += 1}
+
+    d.succeed	# We expect the callback to be called, and the errback to be DISCARDED.
+    d.fail	  # Presumably an error. We expect the errback NOT to be called.
+    d.succeed	# We expect the callback to have been discarded and NOT to be called again.
+
+    assert_equal(1, s)
+    assert_equal(0, e)
+  end
+
+  # Adding a callback to a Deferrable that is already in a success state executes the callback
+  # immediately. The same applies to a an errback added to an already-failed Deferrable.
+  # HOWEVER, we expect NOT to be able to add errbacks to succeeded Deferrables, or callbacks
+  # to failed ones.
+  #
+  # We illustrate this with a rather contrived test. The test calls #fail after #succeed,
+  # which ordinarily would not happen in a real program.
+  #
+  # What we're NOT attempting to specify is what happens if a Deferrable is succeeded and then
+  # failed (or vice-versa). Should we then be able to add callbacks/errbacks of the appropriate
+  # type for immediate execution? For now at least, the official answer is "don't do that."
+  #
+  def test_delayed_callbacks
+    s1 = 0
+    s2 = 0
+    e = 0
+
+    d = EM::DefaultDeferrable.new
+    d.callback {s1 += 1}
+
+    d.succeed # Triggers and discards the callback.
+
+    d.callback {s2 += 1} # This callback is executed immediately and discarded.
+
+    d.errback {e += 1} # This errback should be DISCARDED and never execute.
+    d.fail # To prove it, fail and assert e is 0
+
+    assert_equal( [1,1], [s1,s2] )
+    assert_equal( 0, e )
+  end
+
+  def test_timeout
+    n = 0
+    EM.run {
+      d = EM::DefaultDeferrable.new
+      d.callback {n = 1; EM.stop}
+      d.errback {n = 2; EM.stop}
+      d.timeout(0.01)
+    }
+    assert_equal( 2, n )
+  end
+
+end