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diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
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+#!/bin/sh
+#
+# Copyright (c) 2007 Lars Hjemli
+#
+
+test_description='Basic porcelain support for submodules
+
+This test tries to verify basic sanity of the init, update and status
+subcommands of git submodule.
+'
+
+. ./test-lib.sh
+
+#
+# Test setup:
+#  -create a repository in directory init
+#  -add a couple of files
+#  -add directory init to 'superproject', this creates a DIRLINK entry
+#  -add a couple of regular files to enable testing of submodule filtering
+#  -mv init subrepo
+#  -add an entry to .gitmodules for submodule 'example'
+#
+test_expect_success 'Prepare submodule testing' '
+	: > t &&
+	git add t &&
+	git commit -m "initial commit" &&
+	git branch initial HEAD &&
+	mkdir init &&
+	cd init &&
+	git init &&
+	echo a >a &&
+	git add a &&
+	git commit -m "submodule commit 1" &&
+	git tag -a -m "rev-1" rev-1 &&
+	rev1=$(git rev-parse HEAD) &&
+	if test -z "$rev1"
+	then
+		echo "[OOPS] submodule git rev-parse returned nothing"
+		false
+	fi &&
+	cd .. &&
+	echo a >a &&
+	echo z >z &&
+	git add a init z &&
+	git commit -m "super commit 1" &&
+	mv init .subrepo &&
+	GIT_CONFIG=.gitmodules git config submodule.example.url git://example.com/init.git
+'
+
+test_expect_success 'Prepare submodule add testing' '
+	submodurl=$(pwd)
+	(
+		mkdir addtest &&
+		cd addtest &&
+		git init
+	)
+'
+
+test_expect_success 'submodule add' '
+	(
+		cd addtest &&
+		git submodule add "$submodurl" submod &&
+		git submodule init
+	)
+'
+
+test_expect_success 'submodule add --branch' '
+	(
+		cd addtest &&
+		git submodule add -b initial "$submodurl" submod-branch &&
+		git submodule init &&
+		cd submod-branch &&
+		git branch | grep initial
+	)
+'
+
+test_expect_success 'submodule add with ./ in path' '
+	(
+		cd addtest &&
+		git submodule add "$submodurl" ././dotsubmod/./frotz/./ &&
+		git submodule init
+	)
+'
+
+test_expect_success 'submodule add with // in path' '
+	(
+		cd addtest &&
+		git submodule add "$submodurl" slashslashsubmod///frotz// &&
+		git submodule init
+	)
+'
+
+test_expect_success 'submodule add with /.. in path' '
+	(
+		cd addtest &&
+		git submodule add "$submodurl" dotdotsubmod/../realsubmod/frotz/.. &&
+		git submodule init
+	)
+'
+
+test_expect_success 'submodule add with ./, /.. and // in path' '
+	(
+		cd addtest &&
+		git submodule add "$submodurl" dot/dotslashsubmod/./../..////realsubmod2/a/b/c/d/../../../../frotz//.. &&
+		git submodule init
+	)
+'
+
+test_expect_success 'status should fail for unmapped paths' '
+	if git submodule status
+	then
+		echo "[OOPS] submodule status succeeded"
+		false
+	elif ! GIT_CONFIG=.gitmodules git config submodule.example.path init
+	then
+		echo "[OOPS] git config failed to update .gitmodules"
+		false
+	fi
+'
+
+test_expect_success 'status should only print one line' '
+	lines=$(git submodule status | wc -l) &&
+	test $lines = 1
+'
+
+test_expect_success 'status should initially be "missing"' '
+	git submodule status | grep "^-$rev1"
+'
+
+test_expect_success 'init should register submodule url in .git/config' '
+	git submodule init &&
+	url=$(git config submodule.example.url) &&
+	if test "$url" != "git://example.com/init.git"
+	then
+		echo "[OOPS] init succeeded but submodule url is wrong"
+		false
+	elif test_must_fail git config submodule.example.url ./.subrepo
+	then
+		echo "[OOPS] init succeeded but update of url failed"
+		false
+	fi
+'
+
+test_expect_success 'update should fail when path is used by a file' '
+	echo "hello" >init &&
+	if git submodule update
+	then
+		echo "[OOPS] update should have failed"
+		false
+	elif test "$(cat init)" != "hello"
+	then
+		echo "[OOPS] update failed but init file was molested"
+		false
+	else
+		rm init
+	fi
+'
+
+test_expect_success 'update should fail when path is used by a nonempty directory' '
+	mkdir init &&
+	echo "hello" >init/a &&
+	if git submodule update
+	then
+		echo "[OOPS] update should have failed"
+		false
+	elif test "$(cat init/a)" != "hello"
+	then
+		echo "[OOPS] update failed but init/a was molested"
+		false
+	else
+		rm init/a
+	fi
+'
+
+test_expect_success 'update should work when path is an empty dir' '
+	rm -rf init &&
+	mkdir init &&
+	git submodule update &&
+	head=$(cd init && git rev-parse HEAD) &&
+	if test -z "$head"
+	then
+		echo "[OOPS] Failed to obtain submodule head"
+		false
+	elif test "$head" != "$rev1"
+	then
+		echo "[OOPS] Submodule head is $head but should have been $rev1"
+		false
+	fi
+'
+
+test_expect_success 'status should be "up-to-date" after update' '
+	git submodule status | grep "^ $rev1"
+'
+
+test_expect_success 'status should be "modified" after submodule commit' '
+	cd init &&
+	echo b >b &&
+	git add b &&
+	git commit -m "submodule commit 2" &&
+	rev2=$(git rev-parse HEAD) &&
+	cd .. &&
+	if test -z "$rev2"
+	then
+		echo "[OOPS] submodule git rev-parse returned nothing"
+		false
+	fi &&
+	git submodule status | grep "^+$rev2"
+'
+
+test_expect_success 'the --cached sha1 should be rev1' '
+	git submodule --cached status | grep "^+$rev1"
+'
+
+test_expect_success 'git diff should report the SHA1 of the new submodule commit' '
+	git diff | grep "^+Subproject commit $rev2"
+'
+
+test_expect_success 'update should checkout rev1' '
+	git submodule update init &&
+	head=$(cd init && git rev-parse HEAD) &&
+	if test -z "$head"
+	then
+		echo "[OOPS] submodule git rev-parse returned nothing"
+		false
+	elif test "$head" != "$rev1"
+	then
+		echo "[OOPS] init did not checkout correct head"
+		false
+	fi
+'
+
+test_expect_success 'status should be "up-to-date" after update' '
+	git submodule status | grep "^ $rev1"
+'
+
+test_expect_success 'checkout superproject with subproject already present' '
+	git checkout initial &&
+	git checkout master
+'
+
+test_expect_success 'apply submodule diff' '
+	git branch second &&
+	(
+		cd init &&
+		echo s >s &&
+		git add s &&
+		git commit -m "change subproject"
+	) &&
+	git update-index --add init &&
+	git commit -m "change init" &&
+	git format-patch -1 --stdout >P.diff &&
+	git checkout second &&
+	git apply --index P.diff &&
+	D=$(git diff --cached master) &&
+	test -z "$D"
+'
+
+test_expect_success 'update --init' '
+
+	mv init init2 &&
+	git config -f .gitmodules submodule.example.url "$(pwd)/init2" &&
+	git config --remove-section submodule.example
+	git submodule update init > update.out &&
+	grep "not initialized" update.out &&
+	test ! -d init/.git &&
+	git submodule update --init init &&
+	test -d init/.git
+
+'
+
+test_expect_success 'do not add files from a submodule' '
+
+	git reset --hard &&
+	test_must_fail git add init/a
+
+'
+
+test_expect_success 'gracefully add submodule with a trailing slash' '
+
+	git reset --hard &&
+	git commit -m "commit subproject" init &&
+	(cd init &&
+	 echo b > a) &&
+	git add init/ &&
+	git diff --exit-code --cached init &&
+	commit=$(cd init &&
+	 git commit -m update a >/dev/null &&
+	 git rev-parse HEAD) &&
+	git add init/ &&
+	test_must_fail git diff --exit-code --cached init &&
+	test $commit = $(git ls-files --stage |
+		sed -n "s/^160000 \([^ ]*\).*/\1/p")
+
+'
+
+test_expect_success 'ls-files gracefully handles trailing slash' '
+
+	test "init" = "$(git ls-files init/)"
+
+'
+
+test_expect_success 'submodule <invalid-path> warns' '
+
+	git submodule no-such-submodule 2> output.err &&
+	grep "^error: .*no-such-submodule" output.err
+
+'
+
+test_done