Spread the update downloads over 6 hours

ts/test-node/updater/util_test.ts

@@ -0,0 +1,93 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { isTimeToUpdate } from '../../updater/util';
+import { HOUR } from '../../util/durations';
+import * as logger from '../../logging/log';
+
+describe('updater/util', () => {
+  const now = 1745522337601;
+  describe('isTimeToUpdate', () => {
+    it('should update immediately if update is too far in the past', () => {
+      assert.isTrue(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abc',
+          releasedAt: new Date(0).getTime(),
+          now,
+        })
+      );
+    });
+
+    it('should update immediately if release date invalid', () => {
+      assert.isTrue(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abc',
+          releasedAt: NaN,
+          now,
+        })
+      );
+
+      assert.isTrue(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abc',
+          releasedAt: Infinity,
+          now,
+        })
+      );
+    });
+
+    it('should delay the update', () => {
+      assert.isFalse(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abcd',
+          releasedAt: now,
+          now,
+        })
+      );
+
+      assert.isFalse(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abcd',
+          releasedAt: now,
+          now: now + HOUR,
+        })
+      );
+
+      assert.isTrue(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abcd',
+          releasedAt: now,
+          now: now + 2 * HOUR,
+        })
+      );
+    });
+
+    it('should compute the delay based on pollId', () => {
+      assert.isFalse(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abc',
+          releasedAt: now,
+          now,
+        })
+      );
+
+      assert.isTrue(
+        isTimeToUpdate({
+          logger,
+          pollId: 'abc',
+          releasedAt: now,
+          now: now + HOUR,
+        })
+      );
+    });
+  });
+});