math/big: fix TestShiftOverlap for test -count arguments > 1
Don't overwrite incoming test data.
The change uses copy instead of assigning statement to avoid this.
Change-Id: Ib907101822d811de5c45145cb9d7961907e212c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/250137
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/src/math/big/arith_test.go b/src/math/big/arith_test.go
index 05136f1..e2b982c 100644
--- a/src/math/big/arith_test.go
+++ b/src/math/big/arith_test.go
@@ -241,20 +241,20 @@
}
func testShiftFunc(t *testing.T, f func(z, x []Word, s uint) Word, a argVU) {
- // save a.d for error message, or it will be overwritten.
+ // work on copy of a.d to preserve the original data.
b := make([]Word, len(a.d))
copy(b, a.d)
- z := a.d[a.zp : a.zp+a.l]
- x := a.d[a.xp : a.xp+a.l]
+ z := b[a.zp : a.zp+a.l]
+ x := b[a.xp : a.xp+a.l]
c := f(z, x, a.s)
for i, zi := range z {
if zi != a.r[i] {
- t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot z[%d] = %#x; want %#x", b, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, i, zi, a.r[i])
+ t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot z[%d] = %#x; want %#x", a.d, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, i, zi, a.r[i])
break
}
}
if c != a.c {
- t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot c = %#x; want %#x", b, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, c, a.c)
+ t.Errorf("d := %v, %s(d[%d:%d], d[%d:%d], %d)\n\tgot c = %#x; want %#x", a.d, a.m, a.zp, a.zp+a.l, a.xp, a.xp+a.l, a.s, c, a.c)
}
}
