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-rw-r--r--tests/float/float_format.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/float/float_format.py b/tests/float/float_format.py
index cda395ce02..d43535cf2f 100644
--- a/tests/float/float_format.py
+++ b/tests/float/float_format.py
@@ -13,3 +13,7 @@ for prec in range(8):
# check certain cases that had a digit value of 10 render as a ":" character
print('%.2e' % float('9' * 51 + 'e-39'))
print('%.2e' % float('9' * 40 + 'e-21'))
+
+# check a case that would render negative digit values, eg ")" characters
+# the string is converted back to a float to check for no illegal characters
+float('%.23e' % 1e-80)