git-p4: add failing tests for case-folding p4d

When p4d runs on a case-folding OS, git-p4 can end up getting
very confused. This adds failing tests to demonstrate the problem.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-git-p4.sh

@@ -69,7 +69,7 @@ start_p4d() {
 	(
 		cd "$db" &&
 		{
-			p4d -q -p $P4DPORT &
+			p4d -q -p $P4DPORT "$@" &
 			echo $! >"$pidfile"
 		}
 	) &&

t/t9819-git-p4-case-folding.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+
+test_description='interaction with P4 case-folding'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d with case folding enabled' '
+	start_p4d -C1
+'
+
+test_expect_success 'Create a repo, name is lowercase' '
+	(
+		client_view "//depot/... //client/..." &&
+		cd "$cli" &&
+		mkdir -p lc UC &&
+		>lc/file.txt && >UC/file.txt &&
+		p4 add lc/file.txt UC/file.txt &&
+		p4 submit -d "Add initial lc and UC repos"
+	)
+'
+
+test_expect_success 'Check p4 is in case-folding mode' '
+	(
+		cd "$cli" &&
+		>lc/FILE.TXT &&
+		p4 add lc/FILE.TXT &&
+		test_must_fail p4 submit -d "Cannot add file differing only in case" lc/FILE.TXT
+	)
+'
+
+# Check we created the repo properly
+test_expect_success 'Clone lc repo using lc name' '
+	git p4 clone //depot/lc/... &&
+	test_path_is_file lc/file.txt &&
+	git p4 clone //depot/UC/... &&
+	test_path_is_file UC/file.txt
+'
+
+# The clone should fail, since there is no repo called LC, but because
+# we have case-insensitive p4d enabled, it appears to go ahead and work,
+# but leaves an empty git repo in place.
+test_expect_failure 'Clone lc repo using uc name' '
+	test_must_fail git p4 clone //depot/LC/...
+'
+
+test_expect_failure 'Clone UC repo with lc name' '
+	test_must_fail git p4 clone //depot/uc/...
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done