Add test to check recent fix to "git add -u"

An earlier commit fixed type-change case in "git add -u".
This adds a test to make sure we do not introduce regression.

At the same time, it fixes a stupid typo in the error message.
Signed-off-by: NBenoit Sigoure <tsuna@lrde.epita.fr>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-add.c

@@ -95,7 +95,7 @@ static void update_callback(struct diff_queue_struct *q,
 		const char *path = p->one->path;
 		switch (p->status) {
 		default:
-			die("unexpacted diff status %c", p->status);
+			die("unexpected diff status %c", p->status);
 		case DIFF_STATUS_UNMERGED:
 		case DIFF_STATUS_MODIFIED:
 		case DIFF_STATUS_TYPE_CHANGED:

t/t2200-add-update.sh

@@ -16,11 +16,12 @@ only the updates to dir/sub.'
 test_expect_success setup '
 	echo initial >check &&
 	echo initial >top &&
+	echo initial >foo &&
 	mkdir dir1 dir2 &&
 	echo initial >dir1/sub1 &&
 	echo initial >dir1/sub2 &&
 	echo initial >dir2/sub3 &&
-	git add check dir1 dir2 top &&
+	git add check dir1 dir2 top foo &&
 	test_tick
 	git-commit -m initial &&
 
@@ -76,4 +77,12 @@ test_expect_success 'change gets noticed' '
 
 '
 
+test_expect_success 'replace a file with a symlink' '
+
+	rm foo &&
+	ln -s top foo &&
+	git add -u -- foo
+
+'
+
 test_done