incompatible encoding workaround

* test/lib/minitest/unit.rb (puke): workaround incompatible
  encoding error messages.

* test/lib/test/unit/assertions.rb (AllFailures.message): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53743 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/lib/minitest/unit.rb

@@ -998,7 +998,7 @@ module MiniTest
           else
             @errors += 1
             bt = MiniTest::filter_backtrace(e.backtrace).join "\n    "
-            "Error:\n#{klass}##{meth}:\n#{e.class}: #{e.message}\n    #{bt}\n"
+            "Error:\n#{klass}##{meth}:\n#{e.class}: #{e.message.b}\n    #{bt}\n"
           end
       @report << e
       e[0, 1]

test/lib/test/unit/assertions.rb

@@ -801,7 +801,7 @@ eom
           total = @count.to_s
           fmt = "%#{total.size}d"
           @failures.map {|k, (n, v)|
-            "\n#{i+=1}. [#{fmt%n}/#{total}] Assertion for #{k.inspect}\n#{v.message.gsub(/^/, '   | ')}"
+            "\n#{i+=1}. [#{fmt%n}/#{total}] Assertion for #{k.inspect}\n#{v.message.b.gsub(/^/, '   | ')}"
           }.join("\n")
         end