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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !noopt
package sha3_test
import (
"runtime"
"testing"
"golang.org/x/crypto/sha3"
)
var sink byte
func TestAllocations(t *testing.T) {
want := 0.0
if runtime.GOARCH == "s390x" {
// On s390x the returned hash.Hash is conditional so it escapes.
want = 3.0
}
t.Run("New", func(t *testing.T) {
if allocs := testing.AllocsPerRun(10, func() {
h := sha3.New256()
b := []byte("ABC")
h.Write(b)
out := make([]byte, 0, 32)
out = h.Sum(out)
sink ^= out[0]
}); allocs > want {
t.Errorf("expected zero allocations, got %0.1f", allocs)
}
})
t.Run("NewShake", func(t *testing.T) {
if allocs := testing.AllocsPerRun(10, func() {
h := sha3.NewShake128()
b := []byte("ABC")
h.Write(b)
out := make([]byte, 0, 32)
out = h.Sum(out)
sink ^= out[0]
h.Read(out)
sink ^= out[0]
}); allocs > want {
t.Errorf("expected zero allocations, got %0.1f", allocs)
}
})
t.Run("Sum", func(t *testing.T) {
if allocs := testing.AllocsPerRun(10, func() {
b := []byte("ABC")
out := sha3.Sum256(b)
sink ^= out[0]
}); allocs > want {
t.Errorf("expected zero allocations, got %0.1f", allocs)
}
})
}
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