t4203: demonstrate loss of uppercase characters in canonical email

The email addresses read from .mailmap are downcased before being
inserted into the mailmap data structure, which undesirably loses
information.  It is impossible, for instance, to map <first.last@host>
to <First.Last@host>. Demonstrate this problem.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 8583724375134253c1054f3d8e683bfaba7c6275..ffe6a11ac09105e945f43575060b520c65627d60 100755 (executable)
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -256,6 +256,15 @@ test_expect_success 'single-character name' '
        test_cmp expect actual
 '
 
+test_expect_failure 'preserve canonical email case' '
+       echo "     1    A U Thor <AUTHOR@example.com>" >expect &&
+       echo "     1    nick1 <bugs@company.xx>" >>expect &&
+       echo "<AUTHOR@example.com> <author@example.com>" >.mailmap &&
+       test_when_finished "rm .mailmap" &&
+       git shortlog -es HEAD >actual &&
+       test_cmp expect actual
+'
+
 # Extended mailmap configurations should give us the following output for shortlog
 cat >expect <<\EOF
 A U Thor <author@example.com> (1):