初版功能完成

internal/overlay/clientwg/key_test.go

@@ -0,0 +1,27 @@
+package clientwg
+
+import (
+	"encoding/base64"
+	"testing"
+)
+
+func TestParseKeyBase64(t *testing.T) {
+	t.Parallel()
+	raw := make([]byte, keySize)
+	for index := range raw {
+		raw[index] = byte(index + 1)
+	}
+	key, err := ParseKeyBase64(base64.StdEncoding.EncodeToString(raw))
+	if err != nil {
+		t.Fatalf("ParseKeyBase64() error = %v", err)
+	}
+	if key[0] != 1 || key[31] != 32 {
+		t.Fatalf("ParseKeyBase64() returned unexpected bytes: first=%d last=%d", key[0], key[31])
+	}
+	if _, err := ParseKeyBase64("not-base64"); err == nil {
+		t.Fatal("ParseKeyBase64() accepted invalid base64")
+	}
+	if _, err := ParseKeyBase64(base64.StdEncoding.EncodeToString([]byte{1, 2, 3})); err == nil {
+		t.Fatal("ParseKeyBase64() accepted a short key")
+	}
+}