1 files changed, 127 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/testing/setup_and_teardown.rb b/activesupport/lib/active_support/testing/setup_and_teardown.rb
new file mode 100644
index 0000000000..1639462fae
--- /dev/null
+++ b/activesupport/lib/active_support/testing/setup_and_teardown.rb
@@ -0,0 +1,127 @@
+module ActiveSupport
+  module Testing
+    module SetupAndTeardown
+      def self.included(base)
+        base.extend ClassMethods
+
+        begin
+          require 'mocha'
+          base.alias_method_chain :run, :callbacks_and_mocha
+        rescue LoadError
+          base.alias_method_chain :run, :callbacks
+        end
+      end
+
+      module ClassMethods
+        def setup(*method_names, &block)
+          method_names << block if block_given?
+          (@setup_callbacks ||= []).concat method_names
+        end
+
+        def teardown(*method_names, &block)
+          method_names << block if block_given?
+          (@teardown_callbacks ||= []).concat method_names
+        end
+
+        def setup_callback_chain
+          @setup_callbacks ||= []
+
+          if superclass.respond_to?(:setup_callback_chain)
+            superclass.setup_callback_chain + @setup_callbacks
+          else
+            @setup_callbacks
+          end
+        end
+
+        def teardown_callback_chain
+          @teardown_callbacks ||= []
+
+          if superclass.respond_to?(:teardown_callback_chain)
+            superclass.teardown_callback_chain + @teardown_callbacks
+          else
+            @teardown_callbacks
+          end
+        end
+      end
+
+      # This redefinition is unfortunate but test/unit shows us no alternative.
+      def run_with_callbacks(result) #:nodoc:
+        return if @method_name.to_s == "default_test"
+
+        yield(Test::Unit::TestCase::STARTED, name)
+        @_result = result
+        begin
+          run_callbacks :setup
+          setup
+          __send__(@method_name)
+        rescue Test::Unit::AssertionFailedError => e
+          add_failure(e.message, e.backtrace)
+        rescue *Test::Unit::TestCase::PASSTHROUGH_EXCEPTIONS
+          raise
+        rescue Exception
+          add_error($!)
+        ensure
+          begin
+            teardown
+            run_callbacks :teardown, :reverse_each
+          rescue Test::Unit::AssertionFailedError => e
+            add_failure(e.message, e.backtrace)
+          rescue *Test::Unit::TestCase::PASSTHROUGH_EXCEPTIONS
+            raise
+          rescue Exception
+            add_error($!)
+          end
+        end
+        result.add_run
+        yield(Test::Unit::TestCase::FINISHED, name)
+      end
+
+      # Doubly unfortunate: mocha does the same so we have to hax their hax.
+      def run_with_callbacks_and_mocha(result)
+        return if @method_name.to_s == "default_test"
+
+        yield(Test::Unit::TestCase::STARTED, name)
+        @_result = result
+        begin
+          mocha_setup
+          begin
+            run_callbacks :setup
+            setup
+            __send__(@method_name)
+            mocha_verify { add_assertion }
+          rescue Mocha::ExpectationError => e
+            add_failure(e.message, e.backtrace)
+          rescue Test::Unit::AssertionFailedError => e
+            add_failure(e.message, e.backtrace)
+          rescue StandardError, ScriptError
+            add_error($!)
+          ensure
+            begin
+              teardown
+              run_callbacks :teardown, :reverse_each
+            rescue Test::Unit::AssertionFailedError => e
+              add_failure(e.message, e.backtrace)
+            rescue StandardError, ScriptError
+              add_error($!)
+            end
+          end
+        ensure
+          mocha_teardown
+        end
+        result.add_run
+        yield(Test::Unit::TestCase::FINISHED, name)
+      end
+
+      protected
+        def run_callbacks(kind, enumerator = :each)
+          self.class.send("#{kind}_callback_chain").send(enumerator) do |callback|
+            case callback
+            when Proc; callback.call(self)
+            when String, Symbol; send!(callback)
+            else raise ArgumentError, "Unrecognized callback #{callback.inspect}"
+            end
+          end
+        end
+    end
+  end
+end