44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package crc
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import (
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"hash/crc32"
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"reflect"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// TestHash32 tests that Hash32 provided by this package can take an initial
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// crc and behaves exactly the same as the standard one in the following calls.
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func TestHash32(t *testing.T) {
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stdhash := crc32.New(crc32.IEEETable)
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_, err := stdhash.Write([]byte("test data"))
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require.NoErrorf(t, err, "unexpected write error: %v", err)
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// create a new hash with stdhash.Sum32() as initial crc
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hash := New(stdhash.Sum32(), crc32.IEEETable)
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assert.Equalf(t, hash.Size(), stdhash.Size(), "size")
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assert.Equalf(t, hash.BlockSize(), stdhash.BlockSize(), "block size")
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assert.Equalf(t, hash.Sum32(), stdhash.Sum32(), "Sum32")
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wsum := stdhash.Sum(make([]byte, 32))
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g := hash.Sum(make([]byte, 32))
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assert.Truef(t, reflect.DeepEqual(g, wsum), "sum")
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// write something
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_, err = stdhash.Write([]byte("test data"))
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require.NoErrorf(t, err, "unexpected write error: %v", err)
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_, err = hash.Write([]byte("test data"))
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require.NoErrorf(t, err, "unexpected write error: %v", err)
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assert.Equalf(t, hash.Sum32(), stdhash.Sum32(), "Sum32 after write")
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// reset
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stdhash.Reset()
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hash.Reset()
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assert.Equalf(t, hash.Sum32(), stdhash.Sum32(), "Sum32 after reset")
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}
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