1#!perl
2
3use strict;
4use warnings;
5
6use Test::More tests => 15;
7
8use Math::BigInt   upgrade   => 'Math::BigFloat';
9use Math::BigFloat downgrade => 'Math::BigInt',
10                   upgrade   => 'Math::BigInt';
11
12our ($CLASS, $EXPECTED_CLASS, $LIB);
13$CLASS          = "Math::BigInt";
14$EXPECTED_CLASS = "Math::BigFloat";
15$LIB            = "Math::BigInt::Calc";         # backend
16
17# simplistic test for now
18is(Math::BigFloat->downgrade(), 'Math::BigInt', 'Math::BigFloat->downgrade()');
19is(Math::BigFloat->upgrade(),   'Math::BigInt', 'Math::BigFloat->upgrade()');
20
21# these downgrade
22is(ref(Math::BigFloat->new("inf")), "Math::BigInt",
23   qq|ref(Math::BigFloat->new("inf"))|);
24is(ref(Math::BigFloat->new("-inf")), "Math::BigInt",
25   qq|ref(Math::BigFloat->new("-inf"))|);
26is(ref(Math::BigFloat->new("NaN")), "Math::BigInt",
27   qq|ref(Math::BigFloat->new("NaN"))|);
28is(ref(Math::BigFloat->new("0")), "Math::BigInt",
29   qq|ref(Math::BigFloat->new("0"))|);
30is(ref(Math::BigFloat->new("1")), "Math::BigInt",
31   qq|ref(Math::BigFloat->new("1"))|);
32is(ref(Math::BigFloat->new("10")), "Math::BigInt",
33   qq|ref(Math::BigFloat->new("10"))|);
34is(ref(Math::BigFloat->new("-10")), "Math::BigInt",
35   qq|ref(Math::BigFloat->new("-10"))|);
36is(ref(Math::BigFloat->new("-10.0E1")), "Math::BigInt",
37   qq|ref(Math::BigFloat->new("-10.0E1"))|);
38
39# bug until v1.67:
40is(Math::BigFloat->new("0.2E0"), "0.2", qq|Math::BigFloat->new("0.2E0")|);
41is(Math::BigFloat->new("0.2E1"), "2",   qq|Math::BigFloat->new("0.2E1")|);
42# until v1.67 resulted in 200:
43is(Math::BigFloat->new("0.2E2"), "20",  qq|Math::BigFloat->new("0.2E2")|);
44
45# disable, otherwise it screws calculations
46Math::BigFloat->upgrade(undef);
47is(Math::BigFloat->upgrade() || "", "", qq/Math::BigFloat->upgrade() || ""/);
48
49Math::BigFloat->div_scale(20);  # make it a bit faster
50my $x = Math::BigFloat->new(2);    # downgrades
51# the following test upgrade for bsqrt() and also makes new() NOT downgrade
52# for the bpow() side
53is(Math::BigFloat->bpow("2", "0.5"), $x->bsqrt(),
54   qq|Math::BigFloat->bpow("2", "0.5")|);
55
56#require 'upgrade.inc'; # all tests here for sharing
57