go.etcd.io/etcd@v3.3.27+incompatible/pkg/crc/crc_test.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package crc 6 7 import ( 8 "hash/crc32" 9 "reflect" 10 "testing" 11 ) 12 13 // TestHash32 tests that Hash32 provided by this package can take an initial 14 // crc and behaves exactly the same as the standard one in the following calls. 15 func TestHash32(t *testing.T) { 16 stdhash := crc32.New(crc32.IEEETable) 17 if _, err := stdhash.Write([]byte("test data")); err != nil { 18 t.Fatalf("unexpected write error: %v", err) 19 } 20 // create a new hash with stdhash.Sum32() as initial crc 21 hash := New(stdhash.Sum32(), crc32.IEEETable) 22 23 wsize := stdhash.Size() 24 if g := hash.Size(); g != wsize { 25 t.Errorf("size = %d, want %d", g, wsize) 26 } 27 wbsize := stdhash.BlockSize() 28 if g := hash.BlockSize(); g != wbsize { 29 t.Errorf("block size = %d, want %d", g, wbsize) 30 } 31 wsum32 := stdhash.Sum32() 32 if g := hash.Sum32(); g != wsum32 { 33 t.Errorf("Sum32 = %d, want %d", g, wsum32) 34 } 35 wsum := stdhash.Sum(make([]byte, 32)) 36 if g := hash.Sum(make([]byte, 32)); !reflect.DeepEqual(g, wsum) { 37 t.Errorf("sum = %v, want %v", g, wsum) 38 } 39 40 // write something 41 if _, err := stdhash.Write([]byte("test data")); err != nil { 42 t.Fatalf("unexpected write error: %v", err) 43 } 44 if _, err := hash.Write([]byte("test data")); err != nil { 45 t.Fatalf("unexpected write error: %v", err) 46 } 47 wsum32 = stdhash.Sum32() 48 if g := hash.Sum32(); g != wsum32 { 49 t.Errorf("Sum32 after write = %d, want %d", g, wsum32) 50 } 51 52 // reset 53 stdhash.Reset() 54 hash.Reset() 55 wsum32 = stdhash.Sum32() 56 if g := hash.Sum32(); g != wsum32 { 57 t.Errorf("Sum32 after reset = %d, want %d", g, wsum32) 58 } 59 }