GODT-2187: Placeholder for unbuildable messages

internal/user/sync_build_test.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package user
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/ProtonMail/gluon/imap"
+	"github.com/ProtonMail/gluon/rfc822"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewFailedMessageLiteral(t *testing.T) {
+	literal := newFailedMessageLiteral("abcd-efgh", time.Unix(123456789, 0), "subject", errors.New("oops"))
+
+	header, err := rfc822.Parse(literal).ParseHeader()
+	require.NoError(t, err)
+	require.Equal(t, "Message failed to build", header.Get("Subject"))
+	require.Equal(t, "29 Nov 73 22:33 CET", header.Get("Date"))
+	require.Equal(t, "text/plain", header.Get("Content-Type"))
+	require.Equal(t, "base64", header.Get("Content-Transfer-Encoding"))
+
+	b, err := rfc822.Parse(literal).DecodedBody()
+	require.NoError(t, err)
+	require.Equal(t, string(b), "Failed to build message: \nSubject:   subject\nError:     oops\nMessageID: abcd-efgh\n")
+
+	parsed, err := imap.NewParsedMessage(literal)
+	require.NoError(t, err)
+	require.Equal(t, `("29 Nov 73 22:33 CET" "Message failed to build" NIL NIL NIL NIL NIL NIL NIL NIL)`, parsed.Envelope)
+	require.Equal(t, `("text" "plain" () NIL NIL "base64" 114 2)`, parsed.Body)
+	require.Equal(t, `("text" "plain" () NIL NIL "base64" 114 2 NIL NIL NIL NIL)`, parsed.Structure)
+}