envutil.rb: no signal description iff possible

* test/lib/envutil.rb (FailDesc): show signal description only if
  it is available, or nothing if not killed by a signal.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50905 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/test/lib/envutil.rb b/test/lib/envutil.rb
index cbb855886f..3b3c6337cd 100644
--- a/test/lib/envutil.rb
+++ b/test/lib/envutil.rb
@@ -329,7 +329,8 @@ module Test
           if message and !message.empty?
             full_message << message << "\n"
           end
-          full_message << "pid #{pid} killed by #{sigdesc}"
+          full_message << "pid #{pid}"
+          full_message << " killed by #{sigdesc}" if sigdesc
           if out and !out.empty?
             full_message << "\n#{out.gsub(/^/, '| ')}"
             full_message << "\n" if /\n\z/ !~ full_message