From 291a098c111ff419506094e14c0186389b0020ca Mon Sep 17 00:00:00 2001
From: Matthew Draper <matthew@trebex.net>
Date: Tue, 5 Apr 2016 06:11:28 +0930
Subject: Directly support stateful executor hooks

Also, make sure to call the +complete+ hooks if +run+ fails.
---
 activesupport/test/executor_test.rb | 107 ++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)

(limited to 'activesupport/test')

diff --git a/activesupport/test/executor_test.rb b/activesupport/test/executor_test.rb
index 6db6db4fa8..d9b389461a 100644
--- a/activesupport/test/executor_test.rb
+++ b/activesupport/test/executor_test.rb
@@ -1,6 +1,9 @@
 require 'abstract_unit'
 
 class ExecutorTest < ActiveSupport::TestCase
+  class DummyError < RuntimeError
+  end
+
   def test_wrap_invokes_callbacks
     called = []
     executor.to_run { called << :run }
@@ -35,6 +38,20 @@ class ExecutorTest < ActiveSupport::TestCase
     assert_equal [:run, :body, :complete], called
   end
 
+  def test_exceptions_unwind
+    called = []
+    executor.to_run { called << :run_1 }
+    executor.to_run { raise DummyError }
+    executor.to_run { called << :run_2 }
+    executor.to_complete { called << :complete }
+
+    assert_raises(DummyError) do
+      executor.wrap { called << :body }
+    end
+
+    assert_equal [:run_1, :complete], called
+  end
+
   def test_avoids_double_wrapping
     called = []
     executor.to_run { called << :run }
@@ -51,6 +68,96 @@ class ExecutorTest < ActiveSupport::TestCase
     assert_equal [:run, :early, :body, :late, :complete], called
   end
 
+  def test_hooks_carry_state
+    supplied_state = :none
+
+    hook = Class.new do
+      define_method(:run) do
+        :some_state
+      end
+
+      define_method(:complete) do |state|
+        supplied_state = state
+      end
+    end.new
+
+    executor.register_hook(hook)
+
+    executor.wrap { }
+
+    assert_equal :some_state, supplied_state
+  end
+
+  def test_nil_state_is_sufficient
+    supplied_state = :none
+
+    hook = Class.new do
+      define_method(:run) do
+        nil
+      end
+
+      define_method(:complete) do |state|
+        supplied_state = state
+      end
+    end.new
+
+    executor.register_hook(hook)
+
+    executor.wrap { }
+
+    assert_equal nil, supplied_state
+  end
+
+  def test_exception_skips_uninvoked_hook
+    supplied_state = :none
+
+    hook = Class.new do
+      define_method(:run) do
+        :some_state
+      end
+
+      define_method(:complete) do |state|
+        supplied_state = state
+      end
+    end.new
+
+    executor.to_run do
+      raise DummyError
+    end
+    executor.register_hook(hook)
+
+    assert_raises(DummyError) do
+      executor.wrap { }
+    end
+
+    assert_equal :none, supplied_state
+  end
+
+  def test_exception_unwinds_invoked_hook
+    supplied_state = :none
+
+    hook = Class.new do
+      define_method(:run) do
+        :some_state
+      end
+
+      define_method(:complete) do |state|
+        supplied_state = state
+      end
+    end.new
+
+    executor.register_hook(hook)
+    executor.to_run do
+      raise DummyError
+    end
+
+    assert_raises(DummyError) do
+      executor.wrap { }
+    end
+
+    assert_equal :some_state, supplied_state
+  end
+
   def test_separate_classes_can_wrap
     other_executor = Class.new(ActiveSupport::Executor)
 
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