1 files changed, 51 insertions, 0 deletions
diff --git a/src/cmd/go/internal/cache/hash_test.go b/src/cmd/go/internal/cache/hash_test.go
new file mode 100644
index 0000000..a035677
--- /dev/null
+++ b/src/cmd/go/internal/cache/hash_test.go
@@ -0,0 +1,51 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cache
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestHash(t *testing.T) {
+	oldSalt := hashSalt
+	hashSalt = nil
+	defer func() {
+		hashSalt = oldSalt
+	}()
+
+	h := NewHash("alice")
+	h.Write([]byte("hello world"))
+	sum := fmt.Sprintf("%x", h.Sum())
+	want := "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
+	if sum != want {
+		t.Errorf("hash(hello world) = %v, want %v", sum, want)
+	}
+}
+
+func TestHashFile(t *testing.T) {
+	f, err := os.CreateTemp("", "cmd-go-test-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	name := f.Name()
+	fmt.Fprintf(f, "hello world")
+	defer os.Remove(name)
+	if err := f.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	var h ActionID // make sure hash result is assignable to ActionID
+	h, err = FileHash(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	sum := fmt.Sprintf("%x", h)
+	want := "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
+	if sum != want {
+		t.Errorf("hash(hello world) = %v, want %v", sum, want)
+	}
+}