[PATCH] t/eml.t: workaround newer Email::MIME* behavior

[Eric Wong <e@80x24.org>]

Recent (2020) versions of Email::MIME (and/or dependencies)
have different behavior than historical versions which seem
to be less DWIM and perhaps technically more correct.  We'll
retain historical behavior for now, since it doesn't seem to
cause real problems and DWIM-ness is often required to make
sense of historical mail.

Tested on a FreeBSD 11.4 VM with the following packages:

p5-Email-MIME-1.949
p5-Email-MIME-ContentType-1.024_1
p5-Email-MIME-Encodings-1.315_2
---
 t/eml.t | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/t/eml.t b/t/eml.t
index 8d131b14..4d1c1216 100644
--- a/t/eml.t
+++ b/t/eml.t
@@ -8,6 +8,9 @@ use PublicInbox::MsgIter qw(msg_part_text);
 my @classes = qw(PublicInbox::Eml);
 SKIP: {
 	require_mods('Email::MIME', 1);
+	# TODO: Email::MIME behavior is not consistent in newer versions
+	# we need to evaluate and possibly adjust our behavior to decide
+	# between DWIM-ness with historical mail...
 	push @classes, 'PublicInbox::MIME';
 };
 use_ok $_ for @classes;
@@ -260,6 +263,9 @@ EOF
 }
 
 for my $cls (@classes) {
+SKIP: {
+	skip 'newer Email::MIME behavior inconsistent', 1 if
+		$cls eq 'PublicInbox::MIME';
 	my $s = <<EOF; # buggy git-send-email versions, again?
 Content-Type: text/plain; =?ISO-8859-1?Q?=20charset=3D=1BOF?=
 Content-Transfer-Encoding: 8bit
@@ -269,7 +275,8 @@ Object-Id: ab0440d8cd6d843bee9a27709a459ce3b2bdb94d (lore/kvm)
 EOF
 	my $eml = $cls->new(\$s);
 	my ($str, $err) = msg_part_text($eml, $eml->content_type);
-	is($str, "\x{100}\n", "got wide character by assuming utf-8");
+	is($str, "\x{100}\n", "got wide character by assuming utf-8 ($cls)");
+} # SKIP
 }
 
 if ('we differ from Email::MIME with final "\n" on missing epilogue') {
@@ -383,8 +390,12 @@ SKIP: {
 		$msg->parts_set([$old[-1]]);
 		is(scalar $msg->subparts, 1, 'only last remains');
 	}
-	is($eml->as_string, $mime->as_string,
-		'as_string matches after parts_set');
+
+	# some versions of Email::MIME or Email::MIME::* will drop
+	# unnecessary ", while PublicInbox::Eml will preserve the original
+	my $exp = $mime->as_string;
+	$exp =~ s/; boundary=b\b/; boundary="b"/;
+	is($eml->as_string, $exp, 'as_string matches after parts_set');
 }
 
 for my $cls (@classes) {
@@ -395,7 +406,8 @@ Content-Disposition: attachment; filename="=?utf-8?q?vtpm-makefile.patch?="
 EOF
 	is($cls->new($s)->filename, 'vtpm-makefile.patch', 'filename decoded');
 	$s =~ s/^Content-Disposition:.*$//sm;
-	is($cls->new($s)->filename, 'vtpm-fakefile.patch', 'filename fallback');
+	is($cls->new($s)->filename, 'vtpm-fakefile.patch',
+		"filename fallback ($cls)") if $cls ne 'PublicInbox::MIME';
 	is($cls->new($s)->content_type,
 		'text/x-patch; name="vtpm-fakefile.patch"',
 		'matches Email::MIME output, "correct" or not');
@@ -413,10 +425,14 @@ Content-Type: text/x-patch; name="=?utf-8?q?vtpm-fakefile.patch?="
 b
 --b--
 EOF
-	my @tmp;
-	$cls->new($s)->each_part(sub { push @tmp, $_[0]->[0]->filename });
-	is_deeply(['vtpm-makefile.patch', 'vtpm-fakefile.patch'], \@tmp,
-		'got filename for both attachments');
+	SKIP: {
+		skip 'newer Email::MIME is inconsistent here', 1
+			if $cls eq 'PublicInbox::MIME';
+		my @x;
+		$cls->new($s)->each_part(sub { push @x, $_[0]->[0]->filename });
+		is_deeply(['vtpm-makefile.patch', 'vtpm-fakefile.patch'], \@x,
+			"got filename for both attachments ($cls)");
+	}
 }
 
 done_testing;