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-rw-r--r--test/ruby/test_array.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 64524768e1..8d25e85d62 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -926,6 +926,8 @@ class TestArray < Test::Unit::TestCase
assert_equal(Encoding::US_ASCII, [1, [u]].join.encoding)
assert_equal(Encoding::UTF_8, [u, [e]].join.encoding)
assert_equal(Encoding::UTF_8, [u, [1]].join.encoding)
+ bug5379 = '[ruby-core:39776]'
+ assert_equal(Encoding::UTF_8, [[], u, nil].join.encoding, bug5379)
ensure
$, = nil
end