feat: include steps on json and csv exports (#336)

backend/routes/cases/download.test.js

@@ -37,11 +37,19 @@ vi.mock('../../middleware/verifyVisible.js', () => ({
 // mock defineCase
 const mockCase = {
   findAll: vi.fn(),
+  belongsToMany: vi.fn(),
 };
 vi.mock('../../models/cases.js', () => ({
   default: () => mockCase,
 }));
 
+const mockStep = {
+  belongsToMany: vi.fn(),
+};
+vi.mock('../../models/steps.js', () => ({
+  default: () => mockStep,
+}));
+
 describe('GET /download with type=csv', () => {
   let app;
   const sequelize = new Sequelize({