Add basic test-script for git-submodule

This test tries to verify basic sanity of git-submodule, i.e. that it is
able to clone and update a submodule repository, that its status output is
sane, and that it barfs when the submodule path is occupied during init.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t7400-submodule-basic.sh

@@ -0,0 +1,143 @@
+#!/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 lib
+#  -add a couple of files
+#  -add directory lib to 'superproject', this creates a DIRLINK entry
+#  -add a couple of regular files to enable testing of submodule filtering
+#  -mv lib subrepo
+#  -add an entry to .gitmodules for path 'lib'
+#
+test_expect_success 'Prepare submodule testing' '
+	mkdir lib &&
+	cd lib &&
+	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 lib z &&
+	git-commit -m "super commit 1" &&
+	mv lib .subrepo &&
+	GIT_CONFIG=.gitmodules git-config module.lib.url ./.subrepo
+'
+
+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 fail when path is used by a file' '
+	echo "hello" >lib &&
+	if git-submodule init
+	then
+		echo "[OOPS] init should have failed"
+		false
+	elif test -f lib && test "$(cat lib)" != "hello"
+	then
+		echo "[OOPS] init failed but lib file was molested"
+		false
+	else
+		rm lib
+	fi
+'
+
+test_expect_success 'init should fail when path is used by a nonempty directory' '
+	mkdir lib &&
+	echo "hello" >lib/a &&
+	if git-submodule init
+	then
+		echo "[OOPS] init should have failed"
+		false
+	elif test "$(cat lib/a)" != "hello"
+	then
+		echo "[OOPS] init failed but lib/a was molested"
+		false
+	else
+		rm lib/a
+	fi
+'
+
+test_expect_success 'init should work when path is an empty dir' '
+	rm -rf lib &&
+	mkdir lib &&
+	git-submodule init &&
+	head=$(cd lib && git-rev-parse HEAD) &&
+	if test -z "$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 init' '
+	git-submodule status | grep "^ $rev1"
+'
+
+test_expect_success 'status should be "modified" after submodule commit' '
+	cd lib &&
+	echo b >b &&
+	git-add b &&
+	git-commit -m "submodule commit 2" &&
+	rev2=$(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 "^+$rev1"
+'
+
+test_expect_success 'update should checkout rev1' '
+	git-submodule update &&
+	head=$(cd lib && 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_done