Add a spec for rb_obj_call_init passing blocks.

Author: aardvark179

spec/ruby/optional/capi/object_spec.rb

@@ -30,6 +30,7 @@ def to_array
   class ObjectTest
     def initialize
       @foo = 7
+      yield if block_given?
     end
 
     def foo
@@ -88,6 +89,15 @@ def six(a, b, *c, &d); end
       o.initialized.should be_true
       o.arguments.should == [:one, :two]
     end
+
+    it "passes the block to #initialize" do
+      v = nil
+      o = @o.rb_obj_alloc(ObjectTest)
+      @o.rb_obj_call_init(o, 0, []) do
+        v = :foo
+      end
+      v.should == :foo
+    end
   end
 
   describe "rb_is_instance_of" do