30DaysOfTests: rooster file is not created if not wanted

tests/test-setup-no-file.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# create a new empty volume for tests
+docker volume rm rooster >& /dev/null
+docker volume create rooster >& /dev/null
+
+# don't create the file
+printf 'n\n' | docker run --rm -i -v rooster:/home/rooster \
+    rooster list >& /dev/null
+# rooster should return an error code
+test "$?" = 1 || exit 1
+
+# test that the file is not there
+docker run --rm -v rooster:/data --entrypoint /bin/sh \
+    busybox -c 'test "`ls -a1 /data | grep .passwords.rooster | wc -l`" = 0' || exit 2