added delegate module tests

test/stdlib/Delegate_test.rb

@@ -0,0 +1,29 @@
+require_relative "test_helper"
+require "delegate"
+
+class SimpleDelegatorInstanceTest < Test::Unit::TestCase
+  include TypeAssertions
+
+  library "delegate"
+  testing "::SimpleDelegator[::String]"
+
+  def test_get_obj
+    assert_send_type "() -> String",
+      string_delegator, :__getobj__
+  end
+
+  def test_delegate_method
+    assert_send_type "(String) -> String",
+      string_delegator, :<<, " world"
+  end
+
+  private
+
+  def string_delegator
+    Class.new(SimpleDelegator) do
+      def initialize
+        super("world")
+      end
+    end.new
+  end
+end