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spamsumwriter_test.go
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spamsumwriter_test.go
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// Copyright 2013, Michiel Buddingh, All rights reserved.
// Use of this code is governed by version 2.0 or later of the Apache
// License, available at http://www.apache.org/licenses/LICENSE-2.0
package spamsum
import (
"encoding/binary"
"math/rand"
"testing"
)
func TestWriter(t *testing.T) {
tests := []struct {
seed int64
length int
blocksize uint32
expected string
}{
{42, 16384, 384, "384:PnwCSZ6yE9r4UCZ1he34xas/E8AhHgdd2yM:PbSZ6yE9rGfExx"},
{1000, 2048, 48, "48:Zo+v/bCSly4VhreHwHJdkHTzF7sjBU1YuD/QtFsByxoSJW+QiLlH:uSWSFteQHJd+Tp79mqSqyCt+5LlH"},
{1000, 1048576, 24576, "24576:xL2L/P40/cnWGr7tsP+mgdQGvnb1UV+gQ8ZwU:ErPP/2WItsPTgdD/bqQ4yU"},
{71268, 24, 3, "3:N0n6xmcFctn:7xmptn"},
}
for _, test := range tests {
generator := rand.New(rand.NewSource(test.seed))
writer := StartFixedBlocksize(test.blocksize)
for i := 0; i < test.length/4; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
if writer.String() != test.expected {
t.Errorf("Expected %v, result was %v", test.expected, writer)
}
}
}
func TestWriterIntermediate(t *testing.T) {
generator := rand.New(rand.NewSource(3181))
writer := StartFixedBlocksize(768)
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
expectedIntermediate := "768:Mz4Rjllf5YbJAdWsgdL7rPjcYK1TkTN:MzsjjfqbJkzcLPjcYEW"
actualIntermediate := writer.String()
if actualIntermediate != expectedIntermediate {
t.Errorf("Expected %v, actual %v", expectedIntermediate, actualIntermediate)
}
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
expectedFinal := "768:Mz4Rjllf5YbJAdWsgdL7rPjcYK1TkTQSPNZHrHmwGS8VUSYy20b9n6TZd:MzsjjfqbJkzcLPjcYEcNpXG7VUSR2Q6n"
actualFinal := writer.String()
if actualFinal != expectedFinal {
t.Errorf("Expected %v, actual %v", expectedFinal, actualFinal)
}
}
func TestWriterReset(t *testing.T) {
generator := rand.New(rand.NewSource(3181))
writer := StartFixedBlocksize(768)
emtpySlice := make([]byte, 0)
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
beforeReset := writer.String()
beforeResetBinary := writer.Sum(emtpySlice)
writer.Reset()
generator = rand.New(rand.NewSource(3181))
for i := 0; i < 4096; i++ {
binary.Write(writer, binary.BigEndian, generator.Uint32())
}
afterReset := writer.String()
afterResetBinary := writer.Sum(emtpySlice)
if beforeReset != afterReset {
t.Errorf("Same data written to the same writer, but different results!")
}
if len(afterResetBinary) != len(beforeResetBinary) {
t.Errorf("Binary spamsums are not even the same size")
}
for i, _ := range beforeResetBinary {
if beforeResetBinary[i] != afterResetBinary[i] {
t.Errorf("Binary spamsums before and after reset differ at byte %d", i)
break
}
}
}
func TestSize(t *testing.T) {
writer := StartFixedBlocksize(16)
if writer.Size() != SpamsumLength {
t.Errorf("Max result size should always be equal to SpamsumLength, which is %d\n", SpamsumLength)
}
}