[PATCH 3/4] Add tests for .git file

@@ -0,0 +1,71 @@
+#!/bin/sh
+
+test_description='.git file
+
+Verify that plumbing commands work when .git is a file
+'
+. ./test-lib.sh
+
+chkfile() {
+	D=$(echo $1 | cut -b 1-2) &&
+	F=$(echo $1 | cut -b 3-40) &&
+	if test ! -f $REAL/objects/$D/$F
+	then
+		echo "Object not found: $REAL/objects/$D/$F"
+		false
+	fi
+}
+
+test_expect_success 'setup' '
+	REAL=$(pwd)/.real &&
+	mv .git $REAL &&
+	echo "gitdir: $REAL" >.git
+'
+
+test_expect_success 'check rev-parse --git-dir' '
+	test "$REAL" = "$(git rev-parse --git-dir)"
+'
+
+test_expect_success 'check hash-object' '
+	echo "foo" >bar &&
+	SHA=$(cat bar | git hash-object -w --stdin) &&
+	chkfile $SHA
+'
+
+test_expect_success 'check cat-file' '
+	git cat-file blob $SHA >actual &&
+	diff -u bar actual
+'
+
+test_expect_success 'check update-index' '
+	if test -f $REAL/index
+	then
+		echo "Hmm, $REAL/index exists?"
+		false
+	fi &&
+	rm -rf $REAL/objects/* &&
+	git update-index --add bar &&
+	if ! test -f $REAL/index
+	then
+		echo "$REAL/index not found"
+		false
+	fi &&
+	chkfile $SHA
+'
+
+test_expect_success 'check write-tree' '
+	SHA=$(git write-tree) &&
+	chkfile $SHA
+'
+
+test_expect_success 'check commit-tree' '
+	SHA=$(echo "commit bar" | git commit-tree $SHA) &&
+	chkfile $SHA
+'
+
+test_expect_success 'check rev-list' '
+	echo $SHA >$REAL/HEAD &&
+	test "$SHA" = "$(git rev-list HEAD)"
+'
+
+test_done