1 files changed, 47 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..fc80191c02
--- /dev/null
+++ b/actionpack/test/dispatch/callbacks_test.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+class DispatcherTest < ActiveSupport::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(:call)
+  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
+
+    dispatch do
+      raise "error"
+    end rescue nil
+    assert_equal 6, Foo.a
+    assert_equal 6, Foo.b
+  end
+
+  private
+
+    def dispatch(&block)
+      ActionDispatch::Callbacks.new(block || DummyApp.new).call(
+        "rack.input" => StringIO.new("")
+      )
+    end
+end