hush: "adopt" ash signal4.tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-signals/signal4.tests b/shell/hush_test/hush-signals/signal4.tests
new file mode 100755
index 0000000..6f1c4a9
--- /dev/null
+++ b/shell/hush_test/hush-signals/signal4.tests
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+trap "echo Trapped" BADNAME TERM; echo $?
+kill $$
+echo Ok