add tests

xt/lib/App/NetdiscoX/Worker/Plugin/TestFour.pm

@@ -0,0 +1,17 @@
+package App::NetdiscoX::Worker::Plugin::TestFour;
+
+use Dancer ':syntax';
+use App::Netdisco::Worker::Plugin;
+use aliased 'App::Netdisco::Worker::Status';
+
+# info 'test: override an action';
+
+register_worker({ phase => 'main', driver => 'snmp' }, sub {
+  return Status->done('NOT OK: SNMP driver should NOT be run.');
+});
+
+register_worker({ phase => 'main', priority => 120 }, sub {
+  return Status->done('OK: custom driver is successful.');
+});
+
+true;