+#!perl -w
+use strict;
+use v5.10.1;
+use Test::More;
+my $cls = 'PublicInbox::LeiExternal';
+require_ok $cls;
+my $canon = $cls->can('_canonicalize');
+my $exp = 'https://example.com/my-inbox/';
+is($canon->('https://example.com/my-inbox'), $exp, 'trailing slash added');
+is($canon->('https://example.com/my-inbox//'), $exp, 'trailing slash removed');
+is($canon->('https://example.com//my-inbox/'), $exp, 'leading slash removed');
+is($canon->('https://EXAMPLE.com/my-inbox/'), $exp, 'lowercased');
+is($canon->('/this/path/is/nonexistent/'), '/this/path/is/nonexistent',
+ 'non-existent pathname canonicalized');
+is($canon->('/this//path/'), '/this/path', 'extra slashes gone');
+is($canon->('/ALL/CAPS'), '/ALL/CAPS', 'caps preserved');
+
+done_testing;