Show challenge when requested by server

ts/test-both/util/parseRetryAfter_test.ts

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+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { parseRetryAfter } from '../../util/parseRetryAfter';
+
+describe('parseRetryAfter', () => {
+  it('should return 0 on invalid input', () => {
+    assert.equal(parseRetryAfter('nope'), 1000);
+    assert.equal(parseRetryAfter('1ff'), 1000);
+  });
+
+  it('should return milleseconds on valid input', () => {
+    assert.equal(parseRetryAfter('100'), 100000);
+  });
+
+  it('should return apply minimum value', () => {
+    assert.equal(parseRetryAfter('0'), 1000);
+    assert.equal(parseRetryAfter('-1'), 1000);
+  });
+});