add a test for the core scheduler

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

packages/backend-app-api/package.json

@@ -64,6 +64,7 @@
     "winston-transport": "^4.5.0"
   },
   "devDependencies": {
+    "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@types/compression": "^1.7.0",
     "@types/fs-extra": "^9.0.3",

packages/backend-app-api/src/services/implementations/scheduler/schedulerFactory.test.ts

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {
+  coreServices,
+  createBackendPlugin,
+} from '@backstage/backend-plugin-api';
+import { startTestBackend } from '@backstage/backend-test-utils';
+import { schedulerFactory } from './schedulerFactory';
+
+describe('schedulerFactory', () => {
+  it('creates sidecar database features', async () => {
+    expect.assertions(3);
+
+    const subject = schedulerFactory();
+
+    const plugin = createBackendPlugin({
+      id: 'example',
+      register(reg) {
+        reg.registerInit({
+          deps: {
+            scheduler: subject.service,
+            database: coreServices.database,
+          },
+          init: async ({ scheduler, database }) => {
+            await scheduler.scheduleTask({
+              id: 'task1',
+              timeout: { seconds: 1 },
+              frequency: { seconds: 1 },
+              fn: async () => {},
+            });
+
+            const client = await database.getClient();
+            await expect(
+              client.from('backstage_backend_tasks__tasks').count(),
+            ).resolves.toEqual([{ 'count(*)': 1 }]);
+            await expect(
+              client.from('backstage_backend_tasks__knex_migrations').count(),
+            ).resolves.toEqual([{ 'count(*)': expect.any(Number) }]);
+            await expect(
+              client
+                .from('backstage_backend_tasks__knex_migrations_lock')
+                .count(),
+            ).resolves.toEqual([{ 'count(*)': expect.any(Number) }]);
+          },
+        });
+      },
+    });
+
+    await startTestBackend({
+      features: [plugin()],
+      services: [subject],
+    });
+  });
+});