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package murmur
import (
"encoding/hex"
"fmt"
"strconv"
"testing"
)
func TestRotl(t *testing.T) {
tests := []struct {
in, rotate, exp int64
}{
{123456789, 33, 1060485742448345088},
{-123456789, 33, -1060485733858410497},
{-12345678987654, 33, 1756681988166642059},
{7210216203459776512, 31, -4287945813905642825},
{2453826951392495049, 27, -2013042863942636044},
{270400184080946339, 33, -3553153987756601583},
{2060965185473694757, 31, 6290866853133484661},
{3075794793055692309, 33, -3158909918919076318},
{-6486402271863858009, 31, 405973038345868736},
}
for _, test := range tests {
t.Run(fmt.Sprintf("%d >> %d", test.in, test.rotate), func(t *testing.T) {
if v := rotl(test.in, uint8(test.rotate)); v != test.exp {
t.Fatalf("expected %d got %d", test.exp, v)
}
})
}
}
func TestFmix(t *testing.T) {
tests := []struct {
in, exp int64
}{
{123456789, -8107560010088384378},
{-123456789, -5252787026298255965},
{-12345678987654, -1122383578793231303},
{-1241537367799374202, 3388197556095096266},
{-7566534940689533355, 4729783097411765989},
}
for _, test := range tests {
t.Run(strconv.Itoa(int(test.in)), func(t *testing.T) {
if v := fmix(test.in); v != test.exp {
t.Fatalf("expected %d got %d", test.exp, v)
}
})
}
}
func TestMurmur3H1_CassandraSign(t *testing.T) {
key, err := hex.DecodeString("00104327529fb645dd00b883ec39ae448bb800000400066a6b00")
if err != nil {
t.Fatal(err)
}
h := Murmur3H1(key)
const exp int64 = -9223371632693506265
if h != exp {
t.Fatalf("expected %d got %d", exp, h)
}
}
// Test the implementation of murmur3
func TestMurmur3H1(t *testing.T) {
// these examples are based on adding a index number to a sample string in
// a loop. The expected values were generated by the java datastax murmur3
// implementation. The number of examples here of increasing lengths ensure
// test coverage of all tail-length branches in the murmur3 algorithm
seriesExpected := [...]uint64{
0x0000000000000000, // ""
0x2ac9debed546a380, // "0"
0x649e4eaa7fc1708e, // "01"
0xce68f60d7c353bdb, // "012"
0x0f95757ce7f38254, // "0123"
0x0f04e459497f3fc1, // "01234"
0x88c0a92586be0a27, // "012345"
0x13eb9fb82606f7a6, // "0123456"
0x8236039b7387354d, // "01234567"
0x4c1e87519fe738ba, // "012345678"
0x3f9652ac3effeb24, // "0123456789"
0x3f33760ded9006c6, // "01234567890"
0xaed70a6631854cb1, // "012345678901"
0x8a299a8f8e0e2da7, // "0123456789012"
0x624b675c779249a6, // "01234567890123"
0xa4b203bb1d90b9a3, // "012345678901234"
0xa3293ad698ecb99a, // "0123456789012345"
0xbc740023dbd50048, // "01234567890123456"
0x3fe5ab9837d25cdd, // "012345678901234567"
0x2d0338c1ca87d132, // "0123456789012345678"
}
sample := ""
for i, expected := range seriesExpected {
assertMurmur3H1(t, []byte(sample), expected)
sample = sample + strconv.Itoa(i%10)
}
// Here are some test examples from other driver implementations
assertMurmur3H1(t, []byte("hello"), 0xcbd8a7b341bd9b02)
assertMurmur3H1(t, []byte("hello, world"), 0x342fac623a5ebc8e)
assertMurmur3H1(t, []byte("19 Jan 2038 at 3:14:07 AM"), 0xb89e5988b737affc)
assertMurmur3H1(t, []byte("The quick brown fox jumps over the lazy dog."), 0xcd99481f9ee902c9)
}
// helper function for testing the murmur3 implementation
func assertMurmur3H1(t *testing.T, data []byte, expected uint64) {
actual := Murmur3H1(data)
if actual != int64(expected) {
t.Errorf("Expected h1 = %x for data = %x, but was %x", int64(expected), data, actual)
}
}
// Benchmark of the performance of the murmur3 implementation
func BenchmarkMurmur3H1(b *testing.B) {
data := make([]byte, 1024)
for i := 0; i < 1024; i++ {
data[i] = byte(i)
}
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
h1 := Murmur3H1(data)
if h1 != int64(7627370222079200297) {
b.Fatalf("expected %d got %d", int64(7627370222079200297), h1)
}
}
})
}
|
