From 11ffb9385292e7e0144ba78fcc259336437cbe9b Mon Sep 17 00:00:00 2001
From: Tomoyuki Sahara <tsahara@iij.ad.jp>
Date: Tue, 24 Nov 2015 17:00:12 +0900
Subject: assert_nothing_raised is not available on mruby 1.0.0.

---
 test/io.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/test/io.rb b/test/io.rb
index a35d7a074..5104b343c 100644
--- a/test/io.rb
+++ b/test/io.rb
@@ -1,6 +1,26 @@
 ##
 # IO Test
 
+unless Object.respond_to? :assert_nothing_raised
+  def assert_nothing_raised(*exp)
+    ret = true
+    if $mrbtest_assert
+      $mrbtest_assert_idx += 1
+      msg = exp.last.class == String ? exp.pop : ""
+      begin
+        yield
+      rescue Exception => e
+        msg = "#{msg} exception raised."
+        diff = "      Class: <#{e.class}>\n" +
+          "    Message: #{e.message}"
+        $mrbtest_assert.push([$mrbtest_assert_idx, msg, diff])
+        ret = false
+      end
+    end
+    ret
+  end
+end
+
 assert('IO TEST SETUP') do
   MRubyIOTestUtil.io_test_setup
 end
-- 
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