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@@ -5,6 +5,22 @@
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 $m0 = Module.nesting
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 class TestModule < Test::Unit::TestCase
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+  def assert_method_defined?(klass, mid, message="")
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+    message = build_message(message, "#{klass}\##{mid} expected to be defined.")
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+    _wrap_assertion do
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+      klass.method_defined?(mid) or
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+        raise Test::Unit::AssertionFailedError, message, caller(3)
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+    end
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+  end
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+
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+  def assert_method_not_defined?(klass, mid, message="")
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+    message = build_message(message, "#{klass}\##{mid} expected to not be defined.")
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+    _wrap_assertion do
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+      klass.method_defined?(mid) and
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+        raise Test::Unit::AssertionFailedError, message, caller(3)
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+    end
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+  end
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+
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   def setup
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     @verbose = $VERBOSE
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     $VERBOSE = nil
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@@ -245,12 +261,42 @@
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   end
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   def test_method_defined?
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-    assert(!User.method_defined?(:wombat))
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-    assert(User.method_defined?(:user))
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-    assert(User.method_defined?(:mixin))
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-    assert(!User.method_defined?(:wombat))
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-    assert(User.method_defined?(:user))
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-    assert(User.method_defined?(:mixin))
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+    assert_method_not_defined?(User, :wombat)
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+    assert_method_defined?(User, :user)
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+    assert_method_defined?(User, :mixin)
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+    assert_method_not_defined?(User, :wombat)
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+    assert_method_defined?(User, :user)
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+    assert_method_defined?(User, :mixin)
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+  end
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+
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+  def module_exec_aux
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+    Proc.new do
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+      def dynamically_added_method_3; end
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+    end
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+  end
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+  def module_exec_aux_2(&block)
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+    User.module_exec(&block)
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+  end
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+
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+  def test_module_exec
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+    User.module_exec do
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+      def dynamically_added_method_1; end
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+    end
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+    assert_method_defined?(User, :dynamically_added_method_1)
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+
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+    block = Proc.new do
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+      def dynamically_added_method_2; end
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+    end
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+    User.module_exec(&block)
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+    assert_method_defined?(User, :dynamically_added_method_2)
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+
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+    User.module_exec(&module_exec_aux)
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+    assert_method_defined?(User, :dynamically_added_method_3)
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+
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+    module_exec_aux_2 do
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+      def dynamically_added_method_4; end
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+    end
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+    assert_method_defined?(User, :dynamically_added_method_4)
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   end
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   def test_module_eval