1 files changed, 25 insertions, 0 deletions
diff --git a/libgo/go/cmd/go/internal/modfetch/cache_test.go b/libgo/go/cmd/go/internal/modfetch/cache_test.go
new file mode 100644
index 00000000000..241c800e692
--- /dev/null
+++ b/libgo/go/cmd/go/internal/modfetch/cache_test.go
@@ -0,0 +1,25 @@
+// Copyright 2018 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 modfetch
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestWriteDiskCache(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "go-writeCache-test-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	err = writeDiskCache(filepath.Join(tmpdir, "file"), []byte("data"))
+	if err != nil {
+		t.Fatal(err)
+	}
+}