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 <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: sunshineco

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 <[email protected]>" >expect &&
+	echo "     1	nick1 <[email protected]>" >>expect &&
+	echo "<[email protected]> <[email protected]>" >.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 <[email protected]> (1):