1 files changed, 84 insertions, 0 deletions
diff --git a/tpl/hash/hash_test.go b/tpl/hash/hash_test.go
new file mode 100644
index 000000000..ff5d59a9a
--- /dev/null
+++ b/tpl/hash/hash_test.go
@@ -0,0 +1,84 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// 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
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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 hash provides non-cryptographic hash functions for template use.
+package hash
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+	"github.com/spf13/cast"
+)
+
+func TestXxHash(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+
+	ns := New()
+
+	h, err := ns.XxHash("The quick brown fox jumps over the lazy dog")
+	c.Assert(err, qt.IsNil)
+	// Facit: https://asecuritysite.com/encryption/xxhash?val=The%20quick%20brown%20fox%20jumps%20over%20the%20lazy%20dog
+	c.Assert(h, qt.Equals, "0b242d361fda71bc")
+}
+
+func BenchmarkXxHash(b *testing.B) {
+	const inputSmall = "The quick brown fox jumps over the lazy dog"
+	inputLarge := strings.Repeat(inputSmall, 100)
+
+	runBench := func(name, input string, b *testing.B, fn func(v any)) {
+		b.Run(fmt.Sprintf("%s_%d", name, len(input)), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				fn(input)
+			}
+		})
+	}
+
+	ns := New()
+	fnXxHash := func(v any) {
+		_, err := ns.XxHash(v)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	fnFNv32a := func(v any) {
+		_, err := ns.FNV32a(v)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	// Copied from the crypto tpl/crypto package,
+	// just to have something to compare the above with.
+	fnMD5 := func(v any) {
+		conv, err := cast.ToStringE(v)
+		if err != nil {
+			panic(err)
+		}
+
+		hash := md5.Sum([]byte(conv))
+		_ = hex.EncodeToString(hash[:])
+	}
+
+	for _, input := range []string{inputSmall, inputLarge} {
+		runBench("xxHash", input, b, fnXxHash)
+		runBench("mdb5", input, b, fnMD5)
+		runBench("fnv32a", input, b, fnFNv32a)
+	}
+}