diff options
Diffstat (limited to 'libgo/go/math/big/int_test.go')
| -rw-r--r-- | libgo/go/math/big/int_test.go | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/libgo/go/math/big/int_test.go b/libgo/go/math/big/int_test.go index 27834cec6af..d3c5a0e8bfe 100644 --- a/libgo/go/math/big/int_test.go +++ b/libgo/go/math/big/int_test.go @@ -767,8 +767,10 @@ var expTests = []struct { x, y, m string out string }{ + {"5", "-7", "", "1"}, + {"-5", "-7", "", "1"}, {"5", "0", "", "1"}, - {"-5", "0", "", "-1"}, + {"-5", "0", "", "1"}, {"5", "1", "", "5"}, {"-5", "1", "", "-5"}, {"-2", "3", "2", "0"}, @@ -779,6 +781,7 @@ var expTests = []struct { {"0x8000000000000000", "3", "6719", "5447"}, {"0x8000000000000000", "1000", "6719", "1603"}, {"0x8000000000000000", "1000000", "6719", "3199"}, + {"0x8000000000000000", "-1000000", "6719", "1"}, { "2938462938472983472983659726349017249287491026512746239764525612965293865296239471239874193284792387498274256129746192347", "298472983472983471903246121093472394872319615612417471234712061", @@ -807,12 +810,22 @@ func TestExp(t *testing.T) { continue } - z := y.Exp(x, y, m) - if !isNormalized(z) { - t.Errorf("#%d: %v is not normalized", i, *z) + z1 := new(Int).Exp(x, y, m) + if !isNormalized(z1) { + t.Errorf("#%d: %v is not normalized", i, *z1) + } + if z1.Cmp(out) != 0 { + t.Errorf("#%d: got %s want %s", i, z1, out) } - if z.Cmp(out) != 0 { - t.Errorf("#%d: got %s want %s", i, z, out) + + if m == nil { + // the result should be the same as for m == 0; + // specifically, there should be no div-zero panic + m = &Int{abs: nat{}} // m != nil && len(m.abs) == 0 + z2 := new(Int).Exp(x, y, m) + if z2.Cmp(z1) != 0 { + t.Errorf("#%d: got %s want %s", i, z1, z2) + } } } } |