git-clean: add tests for relative path

This adds tests for recent change by Dmitry to fix the report "git
clean" gives on removed paths, and also makes sure the command detects
paths that is outside working tree.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t7300-clean.sh

@@ -89,6 +89,58 @@ test_expect_success 'git-clean with prefix' '
 	test -f build/lib.so
 
 '
+
+test_expect_success 'git-clean with relative prefix' '
+
+	mkdir -p build docs &&
+	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
+	would_clean=$(
+		cd docs &&
+		git clean -n ../src |
+		sed -n -e "s|^Would remove ||p"
+	) &&
+	test "$would_clean" = ../src/part3.c || {
+		echo "OOps <$would_clean>"
+		false
+	}
+'
+
+test_expect_success 'git-clean with absolute path' '
+
+	mkdir -p build docs &&
+	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
+	would_clean=$(
+		cd docs &&
+		git clean -n $(pwd)/../src |
+		sed -n -e "s|^Would remove ||p"
+	) &&
+	test "$would_clean" = ../src/part3.c || {
+		echo "OOps <$would_clean>"
+		false
+	}
+'
+
+test_expect_success 'git-clean with out of work tree relative path' '
+
+	mkdir -p build docs &&
+	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
+	(
+		cd docs &&
+		test_must_fail git clean -n ../..
+	)
+'
+
+test_expect_success 'git-clean with out of work tree absolute path' '
+
+	mkdir -p build docs &&
+	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
+	dd=$(cd .. && pwd) &&
+	(
+		cd docs &&
+		test_must_fail git clean -n $dd
+	)
+'
+
 test_expect_success 'git-clean -d with prefix and path' '
 
 	mkdir -p build docs src/feature &&