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-rw-r--r--test/assert.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/test/assert.rb b/test/assert.rb
index 9d807d52c..158fc8ead 100644
--- a/test/assert.rb
+++ b/test/assert.rb
@@ -21,7 +21,9 @@ def assertion_string(err, str, iso=nil, e=nil, bt=nil)
msg = "#{err}#{str}"
msg += " [#{iso}]" if iso && !iso.empty?
msg += " => #{e}" if e && !e.to_s.empty?
- msg += " (#{GEMNAME == 'mruby-test' ? 'core' : "mrbgems: #{GEMNAME}"})"
+ if Object.const_defined?(:GEMNAME)
+ msg += " (#{GEMNAME == 'mruby-test' ? 'core' : "mrbgems: #{GEMNAME}"})"
+ end
if $mrbtest_assert && $mrbtest_assert.size > 0
$mrbtest_assert.each do |idx, assert_msg, diff|
msg += "\n - Assertion[#{idx}] Failed: #{assert_msg}\n#{diff}"