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-rw-r--r--test/ruby/test_float.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ruby/test_float.rb b/test/ruby/test_float.rb
index 5742c2d48..27645c3db 100644
--- a/test/ruby/test_float.rb
+++ b/test/ruby/test_float.rb
@@ -81,6 +81,7 @@ class TestFloat < Test::Unit::TestCase
assert_raise(ArgumentError){Float("-")}
assert_raise(ArgumentError){Float("-.")}
assert_raise(ArgumentError){Float("1e")}
+ assert_raise(ArgumentError){Float("1__1")}
# add expected behaviour here.
end