add test for auto-converting integer to pointer

Author: danini-the-panini

test/fiddle/test_function.rb

@@ -98,6 +98,14 @@ def test_call
       assert_in_delta 1.0, func.call(90 * Math::PI / 180), 0.0001
     end
 
+    def test_integer_pointer_conversion
+      func = Function.new(@libc['memcpy'], [TYPE_VOIDP, TYPE_VOIDP, TYPE_SIZE_T], TYPE_VOIDP)
+      str = 'hello'
+      dst = Pointer.malloc(str.bytesize, Fiddle::RUBY_FREE)
+      func.call(dst.to_i, str, dst.size)
+      assert_equal str, dst.to_str
+    end
+
     def test_argument_count
       closure_class = Class.new(Closure) do
         def call one