* ext/dl/cptr.c (rb_dlptr_to_str, rb_dlptr_to_s) adding documentation

* test/dl/test_cptr.rb (test_to_str, test_to_s) testing the
  stringification of DL::Ptr

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@25677 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/dl/test_cptr.rb b/test/dl/test_cptr.rb
index 43605f84c..979c5f50b 100644
--- a/test/dl/test_cptr.rb
+++ b/test/dl/test_cptr.rb
@@ -3,6 +3,28 @@ require_relative '../ruby/envutil'
 
 module DL
   class TestCPtr < TestBase
+    def test_to_str
+      str = "hello world"
+      ptr = CPtr[str]
+
+      assert_equal 3, ptr.to_str(3).length
+      assert_equal str, ptr.to_str
+
+      ptr[5] = 0
+      assert_equal "hello\0world", ptr.to_str
+    end
+
+    def test_to_s
+      str = "hello world"
+      ptr = CPtr[str]
+
+      assert_equal 3, ptr.to_s(3).length
+      assert_equal str, ptr.to_s
+
+      ptr[5] = 0
+      assert_equal 'hello', ptr.to_s
+    end
+
     def test_minus
       str = "hello world"
       ptr = CPtr[str]