1 files changed, 88 insertions, 0 deletions
diff --git a/activesupport/test/concern_test.rb b/activesupport/test/concern_test.rb
new file mode 100644
index 0000000000..22f7ec2064
--- /dev/null
+++ b/activesupport/test/concern_test.rb
@@ -0,0 +1,88 @@
+require 'abstract_unit'
+require 'active_support/concern'
+
+class ConcernTest < Test::Unit::TestCase
+  module Baz
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def baz
+        "baz"
+      end
+
+      def included_ran=(value)
+        @@included_ran = value
+      end
+
+      def included_ran
+        @@included_ran
+      end
+    end
+
+    included do
+      self.included_ran = true
+    end
+
+    def baz
+      "baz"
+    end
+  end
+
+  module Bar
+    extend ActiveSupport::Concern
+
+    depends_on Baz
+
+    def bar
+      "bar"
+    end
+
+    def baz
+      "bar+" + super
+    end
+  end
+
+  module Foo
+    extend ActiveSupport::Concern
+
+    depends_on Bar, Baz
+  end
+
+  def setup
+    @klass = Class.new
+  end
+
+  def test_module_is_included_normally
+    @klass.send(:include, Baz)
+    assert_equal "baz", @klass.new.baz
+    assert_equal ConcernTest::Baz, @klass.included_modules[0]
+
+    @klass.send(:include, Baz)
+    assert_equal "baz", @klass.new.baz
+    assert_equal ConcernTest::Baz, @klass.included_modules[0]
+  end
+
+  def test_class_methods_are_extended
+    @klass.send(:include, Baz)
+    assert_equal "baz", @klass.baz
+    assert_equal ConcernTest::Baz::ClassMethods, (class << @klass; self.included_modules; end)[0]
+  end
+
+  def test_included_block_is_ran
+    @klass.send(:include, Baz)
+    assert_equal true, @klass.included_ran
+  end
+
+  def test_modules_dependencies_are_met
+    @klass.send(:include, Bar)
+    assert_equal "bar", @klass.new.bar
+    assert_equal "bar+baz", @klass.new.baz
+    assert_equal "baz", @klass.baz
+    assert_equal [ConcernTest::Bar, ConcernTest::Baz], @klass.included_modules[0..1]
+  end
+
+  def test_depends_on_with_multiple_modules
+    @klass.send(:include, Foo)
+    assert_equal [ConcernTest::Foo, ConcernTest::Bar, ConcernTest::Baz], @klass.included_modules[0..2]
+  end
+end