Faster WebSocket reconnects

ts/test-both/util/BackOff_test.ts

@@ -0,0 +1,45 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { BackOff } from '../../util/BackOff';
+
+describe('BackOff', () => {
+  it('should return increasing timeouts', () => {
+    const b = new BackOff([1, 2, 3]);
+
+    assert.strictEqual(b.getIndex(), 0);
+    assert.strictEqual(b.isFull(), false);
+
+    assert.strictEqual(b.get(), 1);
+    assert.strictEqual(b.getAndIncrement(), 1);
+    assert.strictEqual(b.get(), 2);
+    assert.strictEqual(b.getIndex(), 1);
+    assert.strictEqual(b.isFull(), false);
+
+    assert.strictEqual(b.getAndIncrement(), 2);
+    assert.strictEqual(b.getIndex(), 2);
+    assert.strictEqual(b.isFull(), true);
+
+    assert.strictEqual(b.getAndIncrement(), 3);
+    assert.strictEqual(b.getIndex(), 2);
+    assert.strictEqual(b.isFull(), true);
+
+    assert.strictEqual(b.getAndIncrement(), 3);
+    assert.strictEqual(b.getIndex(), 2);
+    assert.strictEqual(b.isFull(), true);
+  });
+
+  it('should reset', () => {
+    const b = new BackOff([1, 2, 3]);
+
+    assert.strictEqual(b.getAndIncrement(), 1);
+    assert.strictEqual(b.getAndIncrement(), 2);
+
+    b.reset();
+
+    assert.strictEqual(b.getAndIncrement(), 1);
+    assert.strictEqual(b.getAndIncrement(), 2);
+  });
+});