1 files changed, 43 insertions, 0 deletions
diff --git a/rt/lib/t/regression/06-mime_decoding.t b/rt/lib/t/regression/06-mime_decoding.t
new file mode 100644
index 000000000..98af18513
--- /dev/null
+++ b/rt/lib/t/regression/06-mime_decoding.t
@@ -0,0 +1,43 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use Test::More tests => 5;
+
+use_ok("RT");
+
+RT::LoadConfig();
+RT::Init();
+
+use_ok('RT::I18N');
+
+diag q{'=' char in a leading part before an encoded part} if $ENV{TEST_VERBOSE};
+{
+    my $str = 'key="plain"; key="=?UTF-8?B?0LzQvtC5X9GE0LDQudC7LmJpbg==?="';
+    is(
+        RT::I18N::DecodeMIMEWordsToUTF8($str),
+        'key="plain"; key="мой_файл.bin"',
+        "right decoding"
+    );
+}
+
+diag q{not compliant with standards, but MUAs send such field when attachment has non-ascii in name}
+    if $ENV{TEST_VERBOSE};
+{
+    my $str = 'attachment; filename="=?UTF-8?B?0LzQvtC5X9GE0LDQudC7LmJpbg==?="';
+    is(
+        RT::I18N::DecodeMIMEWordsToUTF8($str),
+        'attachment; filename="мой_файл.bin"',
+        "right decoding"
+    );
+}
+
+diag q{'=' char in a trailing part after an encoded part} if $ENV{TEST_VERBOSE};
+{
+    my $str = 'attachment; filename="=?UTF-8?B?0LzQvtC5X9GE0LDQudC7LmJpbg==?="; some_prop="value"';
+    is(
+        RT::I18N::DecodeMIMEWordsToUTF8($str),
+        'attachment; filename="мой_файл.bin"; some_prop="value"',
+        "right decoding"
+    );
+}
+