Verify the applied plan is not empty (sql resources would be created)

Author: haustenirving

mmv1/third_party/terraform/services/monitoring/resource_monitoring_alert_policy_test.go

@@ -247,7 +247,8 @@ func testAccMonitoringAlertPolicy_sql(t *testing.T) {
 				Config: testAccMonitoringAlertPolicy_sqlCfg(),
 				// SQL alerts require additional GCP resources to be created and billed,
 				// so we only run the plan test for now.
-				PlanOnly: true,
+				PlanOnly:           true,
+				ExpectNonEmptyPlan: true,
 			},
 		},
 	})