From 6c46febf6326a8a119529e2b37f2029178fa7a3e Mon Sep 17 00:00:00 2001
From: Emma Indal <emma.indahl@gmail.com>
Date: Tue, 27 Apr 2021 11:08:37 +0200
Subject: [PATCH] Add tests for Scheduler

Signed-off-by: Emma Indal <emma.indahl@gmail.com>
---
 .../search-backend-node/src/Scheduler.test.ts | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 plugins/search-backend-node/src/Scheduler.test.ts

diff --git a/plugins/search-backend-node/src/Scheduler.test.ts b/plugins/search-backend-node/src/Scheduler.test.ts
new file mode 100644
index 0000000000..43fdb7ea92
--- /dev/null
+++ b/plugins/search-backend-node/src/Scheduler.test.ts
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2021 Spotify AB
+ *
+ * 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 { getVoidLogger } from '@backstage/backend-common';
+import { Scheduler } from './index';
+
+describe('Scheduler', () => {
+  let testScheduler: Scheduler;
+
+  beforeEach(() => {
+    const logger = getVoidLogger();
+    testScheduler = new Scheduler({
+      logger,
+    });
+  });
+
+  describe('addToSchedule', () => {
+    it('should not add a task and interval to schedule, if already started', async () => {
+      jest.useFakeTimers();
+      const mockTask1 = jest.fn();
+      const mockTask2 = jest.fn();
+
+      // Add a task and interval to schedule
+      testScheduler.addToSchedule(mockTask1, 2);
+
+      // Starts scheduling process
+      testScheduler.start();
+
+      // Throws Error if task and interval is added to a already started schedule
+      expect(() => testScheduler.addToSchedule(mockTask2, 2)).toThrowError();
+
+      jest.runOnlyPendingTimers();
+      expect(mockTask1).toHaveBeenCalled();
+      expect(mockTask2).not.toHaveBeenCalled();
+    });
+
+    it('should be possible to add a task and interval to schedule, if already started, but stopped in between', async () => {
+      jest.useFakeTimers();
+      const mockTask1 = jest.fn();
+      const mockTask2 = jest.fn();
+
+      // Add a task and interval to schedule
+      testScheduler.addToSchedule(mockTask1, 2);
+
+      // Starts scheduling process
+      testScheduler.start();
+
+      // Stop scheduling process
+      testScheduler.stop();
+
+      // Should't throw error, as it is stopped.
+      expect(() =>
+        testScheduler.addToSchedule(mockTask2, 4),
+      ).not.toThrowError();
+
+      // Starts scheduling process
+      testScheduler.start();
+
+      jest.runOnlyPendingTimers();
+      expect(mockTask1).toHaveBeenCalled();
+      expect(mockTask2).toHaveBeenCalled();
+    });
+  });
+});