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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 20dc49d92..442c95bf7 100644
--- a/test/t/string.rb
+++ b/test/t/string.rb
@@ -402,6 +402,8 @@ assert('String#index', '15.2.10.5.22') do
assert_equal 0, 'abc'.index('a')
assert_nil 'abc'.index('d')
assert_equal 3, 'abcabc'.index('a', 1)
+ assert_equal 5, "hello".index("", 5)
+ assert_equal nil, "hello".index("", 6)
end
assert('String#initialize', '15.2.10.5.23') do