1 files changed, 44 insertions, 0 deletions
diff --git a/internal/base64_test.go b/internal/base64_test.go
new file mode 100644
index 0000000..f18bcd7
--- /dev/null
+++ b/internal/base64_test.go
@@ -0,0 +1,44 @@
+// Copyright (C) 2022-2023  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package internal
+
+import (
+	"bytes"
+	"encoding/base64"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func b64encode(t *testing.T, input []byte) []byte {
+	var encoded bytes.Buffer
+	enc := base64.NewEncoder(base64.StdEncoding, &encoded)
+	_, err := enc.Write(input)
+	require.NoError(t, err)
+	require.NoError(t, enc.Close())
+	return encoded.Bytes()
+}
+
+func b64decode(t *testing.T, input []byte) []byte {
+	var decoded bytes.Buffer
+	dec := NewBase64Decoder(&decoded)
+	_, err := dec.Write(input)
+	require.NoError(t, err)
+	require.NoError(t, dec.Close())
+	return decoded.Bytes()
+}
+
+func FuzzBase64Decoder(f *testing.F) {
+	f.Fuzz(func(t *testing.T, input []byte) {
+		encoded := b64encode(t, input)
+		decoded := b64decode(t, encoded)
+		t.Logf("input b64        = %q", encoded)
+		t.Logf("expected decoded = %#v", input)
+		t.Logf("actual decoded   = %#v", decoded)
+		if !bytes.Equal(input, decoded) {
+			t.Fail()
+		}
+	})
+}