1 files changed, 22 insertions, 0 deletions
diff --git a/ext/dl/test/test_dl2.rb b/ext/dl/test/test_dl2.rb
index d1b18057cf..e59956cf7b 100644
--- a/ext/dl/test/test_dl2.rb
+++ b/ext/dl/test/test_dl2.rb
@@ -85,5 +85,27 @@ class TestDL < TestBase
     ary2 = dlunwrap(addr)
     assert_equal(ary, ary2)
   end
+
+  def test_cptr()
+    check = Proc.new{|str,ptr|
+      assert_equal(str.size(), ptr.size())
+      assert_equal(str, ptr.to_s())
+      assert_equal(str[0,2], ptr.to_s(2))
+      assert_equal(str[0,2], ptr[0,2])
+      assert_equal(str[1,2], ptr[1,2])
+      assert_equal(str[1,0], ptr[1,0])
+      assert_equal(str[0], ptr[0])
+      assert_equal(str[1], ptr[1])
+    }
+    str = 'abc'
+    ptr = CPtr[str]
+    check.call(str, ptr)
+    str[0] = ?c
+    ptr[0] = ?c
+    check.call(str, ptr)
+    str[0,2] = "aa"
+    ptr[0,2] = "aa"
+    check.call(str, ptr)
+  end
 end
 end # module DL