From e8b36e7711d44bf23a39426b3d766c08528573b3 Mon Sep 17 00:00:00 2001
From: Matthew Draper <matthew@trebex.net>
Date: Mon, 3 Oct 2016 01:34:27 +1030
Subject: Avoid bumping the class serial when invoking executor

---
 activesupport/test/executor_test.rb | 55 +++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'activesupport/test')

diff --git a/activesupport/test/executor_test.rb b/activesupport/test/executor_test.rb
index 0b56ea008f..d409216206 100644
--- a/activesupport/test/executor_test.rb
+++ b/activesupport/test/executor_test.rb
@@ -158,6 +158,61 @@ class ExecutorTest < ActiveSupport::TestCase
     assert_equal :some_state, supplied_state
   end
 
+  def test_hook_insertion_order
+    invoked = []
+    supplied_state = []
+
+    hook_class = Class.new do
+      attr_accessor :letter
+
+      define_method(:initialize) do |letter|
+        self.letter = letter
+      end
+
+      define_method(:run) do
+        invoked << :"run_#{letter}"
+        :"state_#{letter}"
+      end
+
+      define_method(:complete) do |state|
+        invoked << :"complete_#{letter}"
+        supplied_state << state
+      end
+    end
+
+    executor.register_hook(hook_class.new(:a))
+    executor.register_hook(hook_class.new(:b))
+    executor.register_hook(hook_class.new(:c), outer: true)
+    executor.register_hook(hook_class.new(:d))
+
+    executor.wrap {}
+
+    assert_equal [:run_c, :run_a, :run_b, :run_d, :complete_a, :complete_b, :complete_d, :complete_c], invoked
+    assert_equal [:state_a, :state_b, :state_d, :state_c], supplied_state
+  end
+
+  def test_class_serial_is_unaffected
+    hook = Class.new do
+      define_method(:run) do
+        nil
+      end
+
+      define_method(:complete) do |state|
+        nil
+      end
+    end.new
+
+    executor.register_hook(hook)
+
+    before = RubyVM.stat(:class_serial)
+    executor.wrap {}
+    executor.wrap {}
+    executor.wrap {}
+    after = RubyVM.stat(:class_serial)
+
+    assert_equal before, after
+  end
+
   def test_separate_classes_can_wrap
     other_executor = Class.new(ActiveSupport::Executor)
 
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