test: Add factory file for the flow model

packages/backend/test/factories/flow.ts

@@ -0,0 +1,11 @@
+import Flow from '../../src/models/flow';
+import { createUser } from './user';
+
+export const createFlow = async (params: Partial<Flow> = {}) => {
+  params.userId = params?.userId || (await createUser()).id;
+  params.name = params?.name || 'Name your flow!';
+
+  const [flow] = await global.knex.table('flows').insert(params).returning('*');
+
+  return flow;
+};