git-p4: add failing test for P4EDITOR handling

Add test case that git-p4 handles a setting of P4EDITOR
that takes arguments, e.g. "gvim -f". This currently fails.
Signed-off-by: NLuke Diamand <luke@diamand.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t9820-git-p4-editor-handling.sh

+#!/bin/sh
+
+test_description='git p4 handling of EDITOR'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'init depot' '
+	(
+		cd "$cli" &&
+		echo file1 >file1 &&
+		p4 add file1 &&
+		p4 submit -d "file1"
+	)
+'
+
+# Check that the P4EDITOR argument can be given command-line
+# options, which git-p4 will then pass through to the shell.
+test_expect_failure 'EDITOR with options' '
+	git p4 clone --dest="$git" //depot &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		echo change >file1 &&
+		git commit -m "change" file1 &&
+		P4EDITOR=": >\"$git/touched\" && test-chmtime +5" git p4 submit &&
+		test_path_is_file "$git/touched"
+	)
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done