Add a couple of subdirectory tests.

We still have too few of them, but we have to start from somewhere.
The general rule is to make tests easy to debug when run with -v (notice
use of seemingly useless echo everywhere in the new tests).
Signed-off-by: NJunio C Hamano <junkio@cox.net>

t/t1003-read-tree-prefix.sh

+#!/bin/sh
+#
+# Copyright (c) 2006 Junio C Hamano
+#
+
+test_description='git-read-tree --prefix test.
+'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	echo hello >one &&
+	git-update-index --add one &&
+	tree=`git-write-tree` &&
+	echo tree is $tree
+'
+
+echo 'one
+two/one' >expect
+
+test_expect_success 'read-tree --prefix' '
+	git-read-tree --prefix=two/ $tree &&
+	git-ls-files >actual &&
+	cmp expect actual
+'
+
+test_done

t/t1020-subdirectory.sh

+#!/bin/sh
+#
+# Copyright (c) 2006 Junio C Hamano
+#
+
+test_description='Try various core-level commands in subdirectory.
+'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	long="a b c d e f g h i j k l m n o p q r s t u v w x y z" &&
+	for c in $long; do echo $c; done >one &&
+	mkdir dir &&
+	for c in x y z $long a b c; do echo $c; done >dir/two &&
+	cp one original.one &&
+	cp dir/two original.two
+'
+HERE=`pwd`
+LF='
+'
+
+test_expect_success 'update-index and ls-files' '
+	cd $HERE &&
+	git-update-index --add one &&
+	case "`git-ls-files`" in
+	one) echo ok one ;;
+	*) echo bad one; exit 1 ;;
+	esac &&
+	cd dir &&
+	git-update-index --add two &&
+	case "`git-ls-files`" in
+	two) echo ok two ;;
+	*) echo bad two; exit 1 ;;
+	esac &&
+	cd .. &&
+	case "`git-ls-files`" in
+	dir/two"$LF"one) echo ok both ;;
+	*) echo bad; exit 1 ;;
+	esac
+'
+
+test_expect_success 'cat-file' '
+	cd $HERE &&
+	two=`git-ls-files -s dir/two` &&
+	two=`expr "$two" : "[0-7]* \\([0-9a-f]*\\)"` &&
+	echo "$two" &&
+	git-cat-file -p "$two" >actual &&
+	cmp dir/two actual &&
+	cd dir &&
+	git-cat-file -p "$two" >actual &&
+	cmp two actual
+'
+rm -f actual dir/actual
+
+test_expect_success 'diff-files' '
+	cd $HERE &&
+	echo a >>one &&
+	echo d >>dir/two &&
+	case "`git-diff-files --name-only`" in
+	dir/two"$LF"one) echo ok top ;;
+	*) echo bad top; exit 1 ;;
+	esac &&
+	# diff should not omit leading paths
+	cd dir &&
+	case "`git-diff-files --name-only`" in
+	dir/two"$LF"one) echo ok subdir ;;
+	*) echo bad subdir; exit 1 ;;
+	esac &&
+	case "`git-diff-files --name-only .`" in
+	dir/two) echo ok subdir limited ;;
+	*) echo bad subdir limited; exit 1 ;;
+	esac
+'
+
+test_expect_success 'write-tree' '
+	cd $HERE &&
+	top=`git-write-tree` &&
+	echo $top &&
+	cd dir &&
+	sub=`git-write-tree` &&
+	echo $sub &&
+	test "z$top" = "z$sub"
+'
+
+test_expect_success 'checkout-index' '
+	cd $HERE &&
+	git-checkout-index -f -u one &&
+	cmp one original.one &&
+	cd dir &&
+	git-checkout-index -f -u two &&
+	cmp two ../original.two
+'
+
+test_expect_success 'read-tree' '
+	cd $HERE &&
+	rm -f one dir/two &&
+	tree=`git-write-tree` &&
+	git-read-tree --reset -u "$tree" &&
+	cmp one original.one &&
+	cmp dir/two original.two &&
+	cd dir &&
+	rm -f two &&
+	git-read-tree --reset -u "$tree" &&
+	cmp two ../original.two &&
+	cmp ../one ../original.one
+'
+
+test_done