Add test with big real and neg exponent.

Author: Dorian Birraux

wolframclient/tests/deserializers/wxf_deserialize.py

@@ -147,6 +147,11 @@ def test_bigreal_precision_exponent(self):
         res = binary_deserialize(wxf, consumer=WXFConsumer())
         self.assertEqual(res, decimal.Decimal("9.999999999999996843873323328588479844E+999"))
 
+    def test_bigreal_precision_negexponent(self):
+            wxf = b'8:RC4.590261537982443550699999999999999999999281`19.66183743091127*^-16'
+            res = binary_deserialize(wxf, consumer=WXFConsumer())
+            self.assertEqual(res, decimal.Decimal('4.590261537982443550699999999999999999999281E-16'))
+
     def test_empty_lists(self):
         value = ((), ((),), (1, ()), ())
         self.wxf_assert_roundtrip(value)