From 91d28c4ffb253fe64514a543ebb17e9dbeb19374 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 17 Sep 2013 06:53:21 +0000
Subject: assertions.rb: assert_throw

* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert_throw):
  assertion for throw.  MiniTest::Assertions#assert_throws discards
  the cautht value.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42960 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/test/unit/assertions.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'lib')

diff --git a/lib/test/unit/assertions.rb b/lib/test/unit/assertions.rb
index 0c919394ab..29b12f7ca4 100644
--- a/lib/test/unit/assertions.rb
+++ b/lib/test/unit/assertions.rb
@@ -169,6 +169,25 @@ module Test
         ret
       end
 
+      # :call-seq:
+      #   assert_throw( tag, failure_message = nil, &block )
+      #
+      #Fails unless the given block throws +tag+, returns the caught
+      #value otherwise.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    tag = Object.new
+      #    assert_throw(tag, "#{tag} was not thrown!") do
+      #      throw tag
+      #    end
+      def assert_throw(tag, msg = nil)
+        catch(tag) do
+          yield(tag)
+          assert(false, message(msg) {"Expected #{mu_pp(tag)} to have been thrown"})
+        end
+      end
+
       # :call-seq:
       #   assert_equal( expected, actual, failure_message = nil )
       #
-- 
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