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-rw-r--r--mrbgems/mruby-string-ext/test/string.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/mrbgems/mruby-string-ext/test/string.rb b/mrbgems/mruby-string-ext/test/string.rb
index 64a14baf0..eba666e13 100644
--- a/mrbgems/mruby-string-ext/test/string.rb
+++ b/mrbgems/mruby-string-ext/test/string.rb
@@ -285,6 +285,7 @@ assert('String#succ') do
assert_equal "\x01\x00", "\xff".succ
assert_equal "-b", "-a".succ
assert_equal "-aa", "-z".succ
+ assert_equal "-a-b-", "-a-a-".succ
assert_equal "-b-", "-a-".succ
assert_equal "-aa-", "-z-".succ
assert_equal "あb", "あa".succ
@@ -351,6 +352,8 @@ assert('String#succ') do
assert_equal "-b", a
a = "-z"; a.succ!
assert_equal "-aa", a
+ a = "-a-a-"; a.succ!
+ assert_equal "-a-b-", a
a = "-a-"; a.succ!
assert_equal "-b-", a
a = "-z-"; a.succ!