1 files changed, 183 insertions, 0 deletions
diff --git a/activesupport/test/executor_test.rb b/activesupport/test/executor_test.rb
new file mode 100644
index 0000000000..d9b389461a
--- /dev/null
+++ b/activesupport/test/executor_test.rb
@@ -0,0 +1,183 @@
+require 'abstract_unit'
+
+class ExecutorTest < ActiveSupport::TestCase
+  class DummyError < RuntimeError
+  end
+
+  def test_wrap_invokes_callbacks
+    called = []
+    executor.to_run { called << :run }
+    executor.to_complete { called << :complete }
+
+    executor.wrap do
+      called << :body
+    end
+
+    assert_equal [:run, :body, :complete], called
+  end
+
+  def test_callbacks_share_state
+    result = false
+    executor.to_run { @foo = true }
+    executor.to_complete { result = @foo }
+
+    executor.wrap { }
+
+    assert result
+  end
+
+  def test_separated_calls_invoke_callbacks
+    called = []
+    executor.to_run { called << :run }
+    executor.to_complete { called << :complete }
+
+    state = executor.run!
+    called << :body
+    state.complete!
+
+    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 }
+    executor.to_complete { called << :complete }
+
+    executor.wrap do
+      called << :early
+      executor.wrap do
+        called << :body
+      end
+      called << :late
+    end
+
+    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)
+
+    called = []
+    executor.to_run { called << :run }
+    executor.to_complete { called << :complete }
+    other_executor.to_run { called << :other_run }
+    other_executor.to_complete { called << :other_complete }
+
+    executor.wrap do
+      other_executor.wrap do
+        called << :body
+      end
+    end
+
+    assert_equal [:run, :other_run, :body, :other_complete, :complete], called
+  end
+
+  private
+    def executor
+      @executor ||= Class.new(ActiveSupport::Executor)
+    end
+end