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-rw-r--r--test/assert.rb6
1 files changed, 4 insertions, 2 deletions
diff --git a/test/assert.rb b/test/assert.rb
index a1d3482f4..d6e394a9f 100644
--- a/test/assert.rb
+++ b/test/assert.rb
@@ -20,8 +20,10 @@ end
def assertion_string(err, str, iso=nil, e=nil, bt=nil)
msg = "#{err}#{str}"
msg += " [#{iso}]" if iso && iso != ''
- msg += " => #{e.cause}" if e && e.respond_to?(:cause)
- msg += " => #{e.message}" if e && !e.respond_to?(:cause)
+ if e
+ m = e.respond_to?(:cause) ? e.cause : e.message
+ msg += " => #{m}" if m && !m.empty?
+ end
msg += " (#{GEMNAME == 'mruby-test' ? 'core' : "mrbgems: #{GEMNAME}"})"
if $mrbtest_assert && $mrbtest_assert.size > 0
$mrbtest_assert.each do |idx, assert_msg, diff|