New.
diff --git a/testsuite/grep/grep-matches-NUL b/testsuite/grep/grep-matches-NUL
new file mode 100644
index 0000000..04c7fd3
--- /dev/null
+++ b/testsuite/grep/grep-matches-NUL
@@ -0,0 +1,3 @@
+# XFAIL
+echo -e '\0' >foo
+busybox grep . foo