t5411: add basic test cases for proc-receive hook

Topic "proc-receive-hook" will change the workflow and output of
git-push. Add some basic test cases in t5411 before introducing the new
topic.

Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5411/common-functions.sh

@@ -0,0 +1,56 @@
+# Create commits in <repo> and assign each commit's oid to shell variables
+# given in the arguments (A, B, and C). E.g.:
+#
+#     create_commits_in <repo> A B C
+#
+# NOTE: Never calling this function from a subshell since variable
+# assignments will disappear when subshell exits.
+create_commits_in () {
+	repo="$1" &&
+	if ! parent=$(git -C "$repo" rev-parse HEAD^{} --)
+	then
+		parent=
+	fi &&
+	T=$(git -C "$repo" write-tree) &&
+	shift &&
+	while test $# -gt 0
+	do
+		name=$1 &&
+		test_tick &&
+		if test -z "$parent"
+		then
+			oid=$(echo $name | git -C "$repo" commit-tree $T)
+		else
+			oid=$(echo $name | git -C "$repo" commit-tree -p $parent $T)
+		fi &&
+		eval $name=$oid &&
+		parent=$oid &&
+		shift ||
+		return 1
+	done &&
+	git -C "$repo" update-ref refs/heads/master $oid
+}
+
+# Format the output of git-push, git-show-ref and other commands to make a
+# user-friendly and stable text.  We can easily prepare the expect text
+# without having to worry about future changes of the commit ID and spaces
+# of the output.  Single quotes are replaced with double quotes, because
+# it is boring to prepare unquoted single quotes in expect text.  We also
+# remove some locale error messages, which break test if we turn on
+# `GIT_TEST_GETTEXT_POISON=true` in order to test unintentional translations
+# on plumbing commands.
+make_user_friendly_and_stable_output () {
+	sed \
+		-e "s/  *\$//" \
+		-e "s/   */ /g" \
+		-e "s/'/\"/g" \
+		-e "s/	/    /g" \
+		-e "s/$A/<COMMIT-A>/g" \
+		-e "s/$B/<COMMIT-B>/g" \
+		-e "s/$TAG/<TAG-v123>/g" \
+		-e "s/$ZERO_OID/<ZERO-OID>/g" \
+		-e "s/$(echo $A | cut -c1-7)[0-9a-f]*/<OID-A>/g" \
+		-e "s/$(echo $B | cut -c1-7)[0-9a-f]*/<OID-B>/g" \
+		-e "s#To $URL_PREFIX/upstream.git#To <URL/of/upstream.git>#" \
+		-e "/^error: / d"
+}