Start a testutils package.

testutil/testutil.go

@@ -0,0 +1,16 @@
+package testutil
+
+import "io/ioutil"
+
+// TempName generates a new temporary file name. The caller should
+// remove the temporary file when done.
+func TempName() (string, error) {
+	tmpf, err := ioutil.TempFile("", "transport_cachedkp_")
+	if err != nil {
+		return "", err
+	}
+
+	name := tmpf.Name()
+	tmpf.Close()
+	return name, nil
+}