1 files changed, 0 insertions, 11 deletions
diff --git a/mrbgems/mruby-string-ext/test/string.rb b/mrbgems/mruby-string-ext/test/string.rb
index 757b5c50a..024b2cd4b 100644
--- a/mrbgems/mruby-string-ext/test/string.rb
+++ b/mrbgems/mruby-string-ext/test/string.rb
@@ -114,12 +114,6 @@ assert('String#concat') do
   assert_equal "Hello World!", "Hello " << "World" << 33
   assert_equal "Hello World!", "Hello ".concat("World").concat(33)
 
-  o = Object.new
-  def o.to_str
-    "to_str"
-  end
-  assert_equal "hi to_str", "hi " << o
-
   assert_raise(TypeError) { "".concat(Object.new) }
 end
 
@@ -128,11 +122,6 @@ assert('String#casecmp') do
   assert_equal 0, "aBcDeF".casecmp("abcdef")
   assert_equal(-1, "abcdef".casecmp("abcdefg"))
   assert_equal 0, "abcdef".casecmp("ABCDEF")
-  o = Object.new
-  def o.to_str
-    "ABCDEF"
-  end
-  assert_equal 0, "abcdef".casecmp(o)
 end
 
 assert('String#start_with?') do