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// Copyright 2025 samber.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://github.com/samber/ro/blob/main/licenses/LICENSE.apache.md
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rohyperloglog
import (
"fmt"
"testing"
)
func TestStringHashers_FNV64a(t *testing.T) {
hasher := StringHash.FNV64a()
// Test basic functionality
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
// Same input should produce same hash
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
// Different input should produce different hash
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
// Test empty string
emptyHash := hasher("")
if emptyHash == 0 {
t.Error("Empty string should not produce zero hash")
}
// Test long string
longString := "this is a very long string that should be hashed properly"
longHash := hasher(longString)
if longHash == 0 {
t.Error("Long string should not produce zero hash")
}
}
func TestStringHashers_FNV64(t *testing.T) {
hasher := StringHash.FNV64()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_FNV32a(t *testing.T) {
hasher := StringHash.FNV32a()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_FNV32(t *testing.T) {
hasher := StringHash.FNV32()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_SHA256(t *testing.T) {
hasher := StringHash.SHA256()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
// Test that it produces different results than FNV
fnvHasher := StringHash.FNV64a()
fnvResult := fnvHasher("test")
if result1 == fnvResult {
t.Error("SHA256 should produce different results than FNV")
}
}
func TestStringHashers_SHA1(t *testing.T) {
hasher := StringHash.SHA1()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_SHA512(t *testing.T) {
hasher := StringHash.SHA512()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_MD5(t *testing.T) {
hasher := StringHash.MD5()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_MapHash(t *testing.T) {
hasher := StringHash.MapHash()
// MapHash is non-deterministic, so we only test that it produces non-zero results
result1 := hasher("test")
result2 := hasher("different")
if result1 == 0 {
t.Error("MapHash should not produce zero hash")
}
if result2 == 0 {
t.Error("MapHash should not produce zero hash")
}
}
func TestStringHashers_CRC32(t *testing.T) {
hasher := StringHash.CRC32()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_CRC64(t *testing.T) {
hasher := StringHash.CRC64()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_Adler32(t *testing.T) {
hasher := StringHash.Adler32()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_Jenkins(t *testing.T) {
hasher := StringHash.Jenkins()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_DJB2(t *testing.T) {
hasher := StringHash.DJB2()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_SDBM(t *testing.T) {
hasher := StringHash.SDBM()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringHashers_Loselose(t *testing.T) {
hasher := StringHash.Loselose()
result1 := hasher("test")
result2 := hasher("test")
result3 := hasher("different")
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_FNV64a(t *testing.T) {
hasher := BytesHash.FNV64a()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
// Test empty byte slice
emptyHash := hasher([]byte{})
if emptyHash == 0 {
t.Error("Empty byte slice should not produce zero hash")
}
}
func TestBytesHashers_FNV64(t *testing.T) {
hasher := BytesHash.FNV64()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_FNV32a(t *testing.T) {
hasher := BytesHash.FNV32a()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_FNV32(t *testing.T) {
hasher := BytesHash.FNV32()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_SHA256(t *testing.T) {
hasher := BytesHash.SHA256()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_SHA1(t *testing.T) {
hasher := BytesHash.SHA1()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_SHA512(t *testing.T) {
hasher := BytesHash.SHA512()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_MD5(t *testing.T) {
hasher := BytesHash.MD5()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_MapHash(t *testing.T) {
hasher := BytesHash.MapHash()
// MapHash is non-deterministic, so we only test that it produces non-zero results
result1 := hasher([]byte("test"))
result2 := hasher([]byte("different"))
if result1 == 0 {
t.Error("MapHash should not produce zero hash")
}
if result2 == 0 {
t.Error("MapHash should not produce zero hash")
}
}
func TestBytesHashers_CRC32(t *testing.T) {
hasher := BytesHash.CRC32()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_CRC64(t *testing.T) {
hasher := BytesHash.CRC64()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_Adler32(t *testing.T) {
hasher := BytesHash.Adler32()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_Jenkins(t *testing.T) {
hasher := BytesHash.Jenkins()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_DJB2(t *testing.T) {
hasher := BytesHash.DJB2()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_SDBM(t *testing.T) {
hasher := BytesHash.SDBM()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestBytesHashers_Loselose(t *testing.T) {
hasher := BytesHash.Loselose()
result1 := hasher([]byte("test"))
result2 := hasher([]byte("test"))
result3 := hasher([]byte("different"))
if result1 != result2 {
t.Errorf("Same input should produce same hash, got %d and %d", result1, result2)
}
if result1 == result3 {
t.Errorf("Different input should produce different hash, got %d for both", result1)
}
}
func TestStringVsBytesConsistency(t *testing.T) {
// Test that string and bytes hashers produce consistent results
testData := "test string"
stringFNV := StringHash.FNV64a()(testData)
bytesFNV := BytesHash.FNV64a()([]byte(testData))
if stringFNV != bytesFNV {
t.Errorf("String and bytes FNV should produce same result, got %d and %d", stringFNV, bytesFNV)
}
stringSHA := StringHash.SHA256()(testData)
bytesSHA := BytesHash.SHA256()([]byte(testData))
if stringSHA != bytesSHA {
t.Errorf("String and bytes SHA256 should produce same result, got %d and %d", stringSHA, bytesSHA)
}
}
func TestHashDistribution(t *testing.T) {
// Test that hashes are reasonably distributed
hasher := StringHash.FNV64a()
results := make(map[uint64]bool)
// Generate hashes for many different inputs
for i := 0; i < 1000; i++ {
input := fmt.Sprintf("test%d", i)
hash := hasher(input)
results[hash] = true
}
// Check that we have a reasonable number of unique hashes
// (should be close to 1000, but allow for some collisions)
if len(results) < 900 {
t.Errorf("Hash distribution seems poor, got %d unique hashes out of 1000", len(results))
}
}
func TestHashCollisionResistance(t *testing.T) {
// Test that similar inputs produce different hashes
hasher := StringHash.FNV64a()
variations := []string{
"test",
"Test",
"TEST",
"test ",
" test",
"test1",
"1test",
"test\n",
"test\t",
}
results := make(map[uint64]bool)
for _, variation := range variations {
hash := hasher(variation)
if results[hash] {
t.Errorf("Hash collision detected for variations of 'test': %s", variation)
}
results[hash] = true
}
}