t1400: add some more tests involving quoted arguments

Previously there were no good tests of C-quoted arguments.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1400-update-ref.sh

@@ -350,12 +350,18 @@ test_expect_success 'stdin fails on unknown command' '
 	grep "fatal: unknown command: unknown $a" err
 '
 
-test_expect_success 'stdin fails on badly quoted input' '
+test_expect_success 'stdin fails on unbalanced quotes' '
 	echo "create $a \"master" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: badly quoted argument: \\\"master" err
 '
 
+test_expect_success 'stdin fails on invalid escape' '
+	echo "create $a \"ma\zter\"" >stdin &&
+	test_must_fail git update-ref --stdin <stdin 2>err &&
+	grep "fatal: badly quoted argument: \\\"ma\\\\zter\\\"" err
+'
+
 test_expect_success 'stdin fails on junk after quoted argument' '
 	echo "create \"$a\"master" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
@@ -458,6 +464,24 @@ test_expect_success 'stdin create ref works' '
 	test_cmp expect actual
 '
 
+test_expect_success 'stdin succeeds with quoted argument' '
+	git update-ref -d $a &&
+	echo "create $a \"$m\"" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin succeeds with escaped character' '
+	git update-ref -d $a &&
+	echo "create $a \"ma\\163ter\"" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >expect &&
+	git rev-parse $a >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'stdin update ref creates with zero old value' '
 	echo "update $b $m $Z" >stdin &&
 	git update-ref --stdin <stdin &&