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-rw-r--r--lib/rubygems/test_case.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index ced33c4d11..718571ea57 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -1540,7 +1540,7 @@ Also, a list:
# :stopdoc:
# only available in RubyGems tests
- PRIVATE_KEY_PASSPHRASE = 'Foo bar'
+ PRIVATE_KEY_PASSPHRASE = 'Foo bar'.freeze
begin
PRIVATE_KEY = load_key 'private'