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-rw-r--r--test/roo/test_open_office.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/roo/test_open_office.rb b/test/roo/test_open_office.rb
index 18083a5..897945a 100644
--- a/test/roo/test_open_office.rb
+++ b/test/roo/test_open_office.rb
@@ -224,7 +224,7 @@ class TestRooOpenOffice < Minitest::Test
assert workbook.empty?("C", 1)
assert workbook.empty?("D", 1)
expected = 1
- letter = "e"
+ letter = String.new("e")
while letter <= "u"
assert_equal expected, workbook.cell(letter, 1)
letter.succ!