update

utils/hasher/hasher_test.go

@@ -0,0 +1,68 @@
+package hasher_test
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/navidrome/navidrome/utils/hasher"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+func TestHasher(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Hasher Suite")
+}
+
+var _ = Describe("HashFunc", func() {
+	const input = "123e4567e89b12d3a456426614174000"
+
+	It("hashes the input and returns the sum", func() {
+		hashFunc := hasher.HashFunc()
+		sum := hashFunc("1", input)
+		Expect(sum > 0).To(BeTrue())
+	})
+
+	It("hashes the input, reseeds and returns a different sum", func() {
+		hashFunc := hasher.HashFunc()
+		sum := hashFunc("1", input)
+		hasher.Reseed("1")
+		sum2 := hashFunc("1", input)
+		Expect(sum).NotTo(Equal(sum2))
+	})
+
+	It("keeps different hashes for different ids", func() {
+		hashFunc := hasher.HashFunc()
+		sum := hashFunc("1", input)
+		sum2 := hashFunc("2", input)
+
+		Expect(sum).NotTo(Equal(sum2))
+
+		Expect(sum).To(Equal(hashFunc("1", input)))
+		Expect(sum2).To(Equal(hashFunc("2", input)))
+	})
+
+	It("keeps the same hash for the same id and seed", func() {
+		id := "1"
+		hashFunc := hasher.HashFunc()
+		hasher.SetSeed(id, "original_seed")
+		sum := hashFunc(id, input)
+		Expect(sum).To(Equal(hashFunc(id, input)))
+
+		hasher.Reseed(id)
+		Expect(sum).NotTo(Equal(hashFunc(id, input)))
+
+		hasher.SetSeed(id, "original_seed")
+		Expect(sum).To(Equal(hashFunc(id, input)))
+	})
+
+	It("does not cause race conditions", func() {
+		for i := 0; i < 1000; i++ {
+			go func() {
+				hashFunc := hasher.HashFunc()
+				sum := hashFunc(strconv.Itoa(i), input)
+				Expect(sum).ToNot(BeZero())
+			}()
+		}
+	})
+})