1 files changed, 76 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/callbacks_test.rb b/actionpack/test/dispatch/callbacks_test.rb
new file mode 100644
index 0000000000..8a2d56cfcc
--- /dev/null
+++ b/actionpack/test/dispatch/callbacks_test.rb
@@ -0,0 +1,76 @@
+require 'abstract_unit'
+
+class DispatcherTest < Test::Unit::TestCase
+  class Foo
+    cattr_accessor :a, :b
+  end
+
+  class DummyApp
+    def call(env)
+      [200, {}, 'response']
+    end
+  end 
+
+  def setup
+    Foo.a, Foo.b = 0, 0
+    ActionDispatch::Callbacks.reset_callbacks(:prepare)
+    ActionDispatch::Callbacks.reset_callbacks(:call)
+  end
+
+  def test_prepare_callbacks
+    a = b = c = nil
+    ActionDispatch::Callbacks.to_prepare { |*args| a = b = c = 1 }
+    ActionDispatch::Callbacks.to_prepare { |*args| b = c = 2 }
+    ActionDispatch::Callbacks.to_prepare { |*args| c = 3 }
+
+    # Ensure to_prepare callbacks are not run when defined
+    assert_nil a || b || c
+
+    # Run callbacks
+    dispatch
+
+    assert_equal 1, a
+    assert_equal 2, b
+    assert_equal 3, c
+
+    # Make sure they are only run once
+    a = b = c = nil
+    dispatch
+    assert_nil a || b || c
+  end
+
+  def test_to_prepare_with_identifier_replaces
+    ActionDispatch::Callbacks.to_prepare(:unique_id) { |*args| Foo.a, Foo.b = 1, 1 }
+    ActionDispatch::Callbacks.to_prepare(:unique_id) { |*args| Foo.a = 2 }
+
+    dispatch
+    assert_equal 2, Foo.a
+    assert_equal 0, Foo.b
+  end
+
+  def test_before_and_after_callbacks
+    ActionDispatch::Callbacks.before { |*args| Foo.a += 1; Foo.b += 1 }
+    ActionDispatch::Callbacks.after  { |*args| Foo.a += 1; Foo.b += 1 }
+
+    dispatch
+    assert_equal 2, Foo.a
+    assert_equal 2, Foo.b
+
+    dispatch
+    assert_equal 4, Foo.a
+    assert_equal 4, Foo.b
+  end
+
+  def test_should_send_an_instrumentation_callback_for_async_processing
+    ActiveSupport::Notifications.expects(:instrument).with("action_dispatch.callback")
+    dispatch
+  end
+
+  private
+
+    def dispatch(cache_classes = true)
+      @dispatcher ||= ActionDispatch::Callbacks.new(DummyApp.new, !cache_classes)
+      @dispatcher.call({'rack.input' => StringIO.new('')})
+    end
+
+end