Re: [PATCH 21/27] t: define test_grep_return_success()

Denton Liu [off-list ref] writes:

+# Calls grep but returns zero even if no matching lines are found.
+test_grep_return_success () {
+	grep "$@" || :
+}

It makes sense to have a helper like this, but the name is quite a
mouthful.  I wonder if we can call it with a shorter name, e.g.
"test_filter" or something.