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// Copyright 2019 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. package maphash import ( "bytes" "fmt" "hash" "testing" ) func TestUnseededHash(t *testing.T) { m := map[uint64]struct{}{} for i := 0; i < 1000; i++ { h := new(Hash) m[h.Sum64()] = struct{}{} } if len(m) < 900 { t.Errorf("empty hash not sufficiently random: got %d, want 1000", len(m)) } } func TestSeededHash(t *testing.T) { s := MakeSeed() m := map[uint64]struct{}{} for i := 0; i < 1000; i++ { h := new(Hash) h.SetSeed(s) m[h.Sum64()] = struct{}{} } if len(m) != 1 { t.Errorf("seeded hash is random: got %d, want 1", len(m)) } } func TestHashGrouping(t *testing.T) { b := bytes.Repeat([]byte("foo"), 100) hh := make([]*Hash, 7) for i := range hh { hh[i] = new(Hash) } for _, h := range hh[1:] { h.SetSeed(hh[0].Seed()) } hh[0].Write(b) hh[1].WriteString(string(b)) writeByte := func(h *Hash, b byte) { err := h.WriteByte(b) if err != nil { t.Fatalf("WriteByte: %v", err) } } writeSingleByte := func(h *Hash, b byte) { _, err := h.Write([]byte{b}) if err != nil { t.Fatalf("Write single byte: %v", err) } } writeStringSingleByte := func(h *Hash, b byte) { _, err := h.WriteString(string([]byte{b})) if err != nil { t.Fatalf("WriteString single byte: %v", err) } } for i, x := range b { writeByte(hh[2], x) writeSingleByte(hh[3], x) if i == 0 { writeByte(hh[4], x) } else { writeSingleByte(hh[4], x) } writeStringSingleByte(hh[5], x) if i == 0 { writeByte(hh[6], x) } else { writeStringSingleByte(hh[6], x) } } sum := hh[0].Sum64() for i, h := range hh { if sum != h.Sum64() { t.Errorf("hash %d not identical to a single Write", i) } } if sum1 := Bytes(hh[0].Seed(), b); sum1 != hh[0].Sum64() { t.Errorf("hash using Bytes not identical to a single Write") } if sum1 := String(hh[0].Seed(), string(b)); sum1 != hh[0].Sum64() { t.Errorf("hash using String not identical to a single Write") } } func TestHashBytesVsString(t *testing.T) { s := "foo" b := []byte(s) h1 := new(Hash) h2 := new(Hash) h2.SetSeed(h1.Seed()) n1, err1 := h1.WriteString(s) if n1 != len(s) || err1 != nil { t.Fatalf("WriteString(s) = %d, %v, want %d, nil", n1, err1, len(s)) } n2, err2 := h2.Write(b) if n2 != len(b) || err2 != nil { t.Fatalf("Write(b) = %d, %v, want %d, nil", n2, err2, len(b)) } if h1.Sum64() != h2.Sum64() { t.Errorf("hash of string and bytes not identical") } } func TestHashHighBytes(t *testing.T) { // See issue 34925. const N = 10 m := map[uint64]struct{}{} for i := 0; i < N; i++ { h := new(Hash) h.WriteString("foo") m[h.Sum64()>>32] = struct{}{} } if len(m) < N/2 { t.Errorf("from %d seeds, wanted at least %d different hashes; got %d", N, N/2, len(m)) } } func TestRepeat(t *testing.T) { h1 := new(Hash) h1.WriteString("testing") sum1 := h1.Sum64() h1.Reset() h1.WriteString("testing") sum2 := h1.Sum64() if sum1 != sum2 { t.Errorf("different sum after resetting: %#x != %#x", sum1, sum2) } h2 := new(Hash) h2.SetSeed(h1.Seed()) h2.WriteString("testing") sum3 := h2.Sum64() if sum1 != sum3 { t.Errorf("different sum on the same seed: %#x != %#x", sum1, sum3) } } func TestSeedFromSum64(t *testing.T) { h1 := new(Hash) h1.WriteString("foo") x := h1.Sum64() // seed generated here h2 := new(Hash) h2.SetSeed(h1.Seed()) h2.WriteString("foo") y := h2.Sum64() if x != y { t.Errorf("hashes don't match: want %x, got %x", x, y) } } func TestSeedFromSeed(t *testing.T) { h1 := new(Hash) h1.WriteString("foo") _ = h1.Seed() // seed generated here x := h1.Sum64() h2 := new(Hash) h2.SetSeed(h1.Seed()) h2.WriteString("foo") y := h2.Sum64() if x != y { t.Errorf("hashes don't match: want %x, got %x", x, y) } } func TestSeedFromFlush(t *testing.T) { b := make([]byte, 65) h1 := new(Hash) h1.Write(b) // seed generated here x := h1.Sum64() h2 := new(Hash) h2.SetSeed(h1.Seed()) h2.Write(b) y := h2.Sum64() if x != y { t.Errorf("hashes don't match: want %x, got %x", x, y) } } func TestSeedFromReset(t *testing.T) { h1 := new(Hash) h1.WriteString("foo") h1.Reset() // seed generated here h1.WriteString("foo") x := h1.Sum64() h2 := new(Hash) h2.SetSeed(h1.Seed()) h2.WriteString("foo") y := h2.Sum64() if x != y { t.Errorf("hashes don't match: want %x, got %x", x, y) } } // Make sure a Hash implements the hash.Hash and hash.Hash64 interfaces. var _ hash.Hash = &Hash{} var _ hash.Hash64 = &Hash{} func benchmarkSize(b *testing.B, size int) { h := &Hash{} buf := make([]byte, size) s := string(buf) b.Run("Write", func(b *testing.B) { b.SetBytes(int64(size)) for i := 0; i < b.N; i++ { h.Reset() h.Write(buf) h.Sum64() } }) b.Run("Bytes", func(b *testing.B) { b.SetBytes(int64(size)) seed := h.Seed() for i := 0; i < b.N; i++ { Bytes(seed, buf) } }) b.Run("String", func(b *testing.B) { b.SetBytes(int64(size)) seed := h.Seed() for i := 0; i < b.N; i++ { String(seed, s) } }) } func BenchmarkHash(b *testing.B) { sizes := []int{4, 8, 16, 32, 64, 256, 320, 1024, 4096, 16384} for _, size := range sizes { b.Run(fmt.Sprint("n=", size), func(b *testing.B) { benchmarkSize(b, size) }) } }