/usr/lib/python2.7/test/decimaltestdata/ddMinus.decTest is in libpython2.7-testsuite 2.7.6-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- ddMinus.decTest -- decDouble 0-x --
-- Copyright (c) IBM Corporation, 1981, 2008. All rights reserved. --
------------------------------------------------------------------------
-- Please see the document "General Decimal Arithmetic Testcases" --
-- at http://www2.hursley.ibm.com/decimal for the description of --
-- these testcases. --
-- --
-- These testcases are experimental ('beta' versions), and they --
-- may contain errors. They are offered on an as-is basis. In --
-- particular, achieving the same results as the tests here is not --
-- a guarantee that an implementation complies with any Standard --
-- or specification. The tests are not exhaustive. --
-- --
-- Please send comments, suggestions, and corrections to the author: --
-- Mike Cowlishaw, IBM Fellow --
-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
-- mfc@uk.ibm.com --
------------------------------------------------------------------------
version: 2.59
-- All operands and results are decDoubles.
precision: 16
maxExponent: 384
minExponent: -383
extended: 1
clamp: 1
rounding: half_even
-- Sanity check
ddmns001 minus +7.50 -> -7.50
-- Infinities
ddmns011 minus Infinity -> -Infinity
ddmns012 minus -Infinity -> Infinity
-- NaNs, 0 payload
ddmns021 minus NaN -> NaN
ddmns022 minus -NaN -> -NaN
ddmns023 minus sNaN -> NaN Invalid_operation
ddmns024 minus -sNaN -> -NaN Invalid_operation
-- NaNs, non-0 payload
ddmns031 minus NaN13 -> NaN13
ddmns032 minus -NaN13 -> -NaN13
ddmns033 minus sNaN13 -> NaN13 Invalid_operation
ddmns034 minus -sNaN13 -> -NaN13 Invalid_operation
ddmns035 minus NaN70 -> NaN70
ddmns036 minus -NaN70 -> -NaN70
ddmns037 minus sNaN101 -> NaN101 Invalid_operation
ddmns038 minus -sNaN101 -> -NaN101 Invalid_operation
-- finites
ddmns101 minus 7 -> -7
ddmns102 minus -7 -> 7
ddmns103 minus 75 -> -75
ddmns104 minus -75 -> 75
ddmns105 minus 7.50 -> -7.50
ddmns106 minus -7.50 -> 7.50
ddmns107 minus 7.500 -> -7.500
ddmns108 minus -7.500 -> 7.500
-- zeros
ddmns111 minus 0 -> 0
ddmns112 minus -0 -> 0
ddmns113 minus 0E+4 -> 0E+4
ddmns114 minus -0E+4 -> 0E+4
ddmns115 minus 0.0000 -> 0.0000
ddmns116 minus -0.0000 -> 0.0000
ddmns117 minus 0E-141 -> 0E-141
ddmns118 minus -0E-141 -> 0E-141
-- full coefficients, alternating bits
ddmns121 minus 2682682682682682 -> -2682682682682682
ddmns122 minus -2682682682682682 -> 2682682682682682
ddmns123 minus 1341341341341341 -> -1341341341341341
ddmns124 minus -1341341341341341 -> 1341341341341341
-- Nmax, Nmin, Ntiny
ddmns131 minus 9.999999999999999E+384 -> -9.999999999999999E+384
ddmns132 minus 1E-383 -> -1E-383
ddmns133 minus 1.000000000000000E-383 -> -1.000000000000000E-383
ddmns134 minus 1E-398 -> -1E-398 Subnormal
ddmns135 minus -1E-398 -> 1E-398 Subnormal
ddmns136 minus -1.000000000000000E-383 -> 1.000000000000000E-383
ddmns137 minus -1E-383 -> 1E-383
ddmns138 minus -9.999999999999999E+384 -> 9.999999999999999E+384
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