mse: Move sliceIter into test file

mse/mse.go

@@ -548,16 +548,6 @@ func ReceiveHandshake(rw io.ReadWriter, skeys SecretKeyIter, selectCrypto func(u
 	return h.Do()
 }
 
-func sliceIter(skeys [][]byte) SecretKeyIter {
-	return func(callback func([]byte) bool) {
-		for _, sk := range skeys {
-			if !callback(sk) {
-				break
-			}
-		}
-	}
-}
-
 // A function that given a function, calls it with secret keys until it
 // returns false or exhausted.
 type SecretKeyIter func(callback func(skey []byte) (more bool))

mse/mse_test.go

@@ -16,6 +16,16 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func sliceIter(skeys [][]byte) SecretKeyIter {
+	return func(callback func([]byte) bool) {
+		for _, sk := range skeys {
+			if !callback(sk) {
+				break
+			}
+		}
+	}
+}
+
 func TestReadUntil(t *testing.T) {
 	test := func(data, until string, leftover int, expectedErr error) {
 		r := bytes.NewReader([]byte(data))