/usr/lib/python3.5/test/decimaltestdata/nextminus.decTest is in libpython3.5-testsuite 3.5.1-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- nextminus.decTest -- decimal next that is less [754r nextdown] --
-- 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
extended: 1
precision: 9
rounding: half_up
maxExponent: 384
minexponent: -383
nextm001 nextminus 0.999999995 -> 0.999999994
nextm002 nextminus 0.999999996 -> 0.999999995
nextm003 nextminus 0.999999997 -> 0.999999996
nextm004 nextminus 0.999999998 -> 0.999999997
nextm005 nextminus 0.999999999 -> 0.999999998
nextm006 nextminus 1.00000000 -> 0.999999999
nextm007 nextminus 1.0 -> 0.999999999
nextm008 nextminus 1 -> 0.999999999
nextm009 nextminus 1.00000001 -> 1.00000000
nextm010 nextminus 1.00000002 -> 1.00000001
nextm011 nextminus 1.00000003 -> 1.00000002
nextm012 nextminus 1.00000004 -> 1.00000003
nextm013 nextminus 1.00000005 -> 1.00000004
nextm014 nextminus 1.00000006 -> 1.00000005
nextm015 nextminus 1.00000007 -> 1.00000006
nextm016 nextminus 1.00000008 -> 1.00000007
nextm017 nextminus 1.00000009 -> 1.00000008
nextm018 nextminus 1.00000010 -> 1.00000009
nextm019 nextminus 1.00000011 -> 1.00000010
nextm020 nextminus 1.00000012 -> 1.00000011
nextm021 nextminus -0.999999995 -> -0.999999996
nextm022 nextminus -0.999999996 -> -0.999999997
nextm023 nextminus -0.999999997 -> -0.999999998
nextm024 nextminus -0.999999998 -> -0.999999999
nextm025 nextminus -0.999999999 -> -1.00000000
nextm026 nextminus -1.00000000 -> -1.00000001
nextm027 nextminus -1.0 -> -1.00000001
nextm028 nextminus -1 -> -1.00000001
nextm029 nextminus -1.00000001 -> -1.00000002
nextm030 nextminus -1.00000002 -> -1.00000003
nextm031 nextminus -1.00000003 -> -1.00000004
nextm032 nextminus -1.00000004 -> -1.00000005
nextm033 nextminus -1.00000005 -> -1.00000006
nextm034 nextminus -1.00000006 -> -1.00000007
nextm035 nextminus -1.00000007 -> -1.00000008
nextm036 nextminus -1.00000008 -> -1.00000009
nextm037 nextminus -1.00000009 -> -1.00000010
nextm038 nextminus -1.00000010 -> -1.00000011
nextm039 nextminus -1.00000011 -> -1.00000012
-- input operand is >precision
nextm041 nextminus 1.00000010998 -> 1.00000010
nextm042 nextminus 1.00000010999 -> 1.00000010
nextm043 nextminus 1.00000011000 -> 1.00000010
nextm044 nextminus 1.00000011001 -> 1.00000011
nextm045 nextminus 1.00000011002 -> 1.00000011
nextm046 nextminus 1.00000011002 -> 1.00000011
nextm047 nextminus 1.00000011052 -> 1.00000011
nextm048 nextminus 1.00000011552 -> 1.00000011
nextm049 nextminus -1.00000010998 -> -1.00000011
nextm050 nextminus -1.00000010999 -> -1.00000011
nextm051 nextminus -1.00000011000 -> -1.00000012
nextm052 nextminus -1.00000011001 -> -1.00000012
nextm053 nextminus -1.00000011002 -> -1.00000012
nextm054 nextminus -1.00000011002 -> -1.00000012
nextm055 nextminus -1.00000011052 -> -1.00000012
nextm056 nextminus -1.00000011552 -> -1.00000012
-- ultra-tiny inputs
nextm060 nextminus 1E-99999 -> 0E-391
nextm061 nextminus 1E-999999999 -> 0E-391
nextm062 nextminus 1E-391 -> 0E-391
nextm063 nextminus -1E-99999 -> -1E-391
nextm064 nextminus -1E-999999999 -> -1E-391
nextm065 nextminus -1E-391 -> -2E-391
-- Zeros
nextm100 nextminus -0 -> -1E-391
nextm101 nextminus 0 -> -1E-391
nextm102 nextminus 0.00 -> -1E-391
nextm103 nextminus -0.00 -> -1E-391
nextm104 nextminus 0E-300 -> -1E-391
nextm105 nextminus 0E+300 -> -1E-391
nextm106 nextminus 0E+30000 -> -1E-391
nextm107 nextminus -0E+30000 -> -1E-391
precision: 9
maxExponent: 999
minexponent: -999
-- specials
nextm150 nextminus Inf -> 9.99999999E+999
nextm151 nextminus -Inf -> -Infinity
nextm152 nextminus NaN -> NaN
nextm153 nextminus sNaN -> NaN Invalid_operation
nextm154 nextminus NaN77 -> NaN77
nextm155 nextminus sNaN88 -> NaN88 Invalid_operation
nextm156 nextminus -NaN -> -NaN
nextm157 nextminus -sNaN -> -NaN Invalid_operation
nextm158 nextminus -NaN77 -> -NaN77
nextm159 nextminus -sNaN88 -> -NaN88 Invalid_operation
-- Nmax, Nmin, Ntiny, subnormals
nextm170 nextminus 9.99999999E+999 -> 9.99999998E+999
nextm171 nextminus 9.99999998E+999 -> 9.99999997E+999
nextm172 nextminus 1E-999 -> 9.9999999E-1000
nextm173 nextminus 1.00000000E-999 -> 9.9999999E-1000
nextm174 nextminus 9E-1007 -> 8E-1007
nextm175 nextminus 9.9E-1006 -> 9.8E-1006
nextm176 nextminus 9.9999E-1003 -> 9.9998E-1003
nextm177 nextminus 9.9999999E-1000 -> 9.9999998E-1000
nextm178 nextminus 9.9999998E-1000 -> 9.9999997E-1000
nextm179 nextminus 9.9999997E-1000 -> 9.9999996E-1000
nextm180 nextminus 0E-1007 -> -1E-1007
nextm181 nextminus 1E-1007 -> 0E-1007
nextm182 nextminus 2E-1007 -> 1E-1007
nextm183 nextminus -0E-1007 -> -1E-1007
nextm184 nextminus -1E-1007 -> -2E-1007
nextm185 nextminus -2E-1007 -> -3E-1007
nextm186 nextminus -10E-1007 -> -1.1E-1006
nextm187 nextminus -100E-1007 -> -1.01E-1005
nextm188 nextminus -100000E-1007 -> -1.00001E-1002
nextm189 nextminus -1.0000E-999 -> -1.00000001E-999
nextm190 nextminus -1.00000000E-999 -> -1.00000001E-999
nextm191 nextminus -1E-999 -> -1.00000001E-999
nextm192 nextminus -9.99999998E+999 -> -9.99999999E+999
nextm193 nextminus -9.99999999E+999 -> -Infinity
-- Null tests
nextm900 nextminus # -> NaN Invalid_operation
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