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-rw-r--r--test/t/string.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/t/string.rb b/test/t/string.rb
index c42fa006f..56ae49d96 100644
--- a/test/t/string.rb
+++ b/test/t/string.rb
@@ -118,6 +118,7 @@ assert('String#capitalize', '15.2.10.5.7') do
assert_equal 'abc', a
assert_equal 'Abc', 'abc'.capitalize
+ assert_equal nil, 'Abc'.capitalize!
end
assert('String#capitalize!', '15.2.10.5.8') do
@@ -196,6 +197,7 @@ assert('String#downcase', '15.2.10.5.13') do
assert_equal 'abc', a
assert_equal 'ABC', b
+ assert_equal nil, 'abc'.downcase!
end
assert('String#downcase!', '15.2.10.5.14') do