Receive rings for group calls

ts/test-both/util/callingGetParticipantName_test.ts

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+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { getParticipantName } from '../../util/callingGetParticipantName';
+
+describe('getParticipantName', () => {
+  it('returns the first name if available', () => {
+    const participant = {
+      firstName: 'Foo',
+      title: 'Foo Bar',
+    };
+
+    assert.strictEqual(getParticipantName(participant), 'Foo');
+  });
+
+  it('returns the title if the first name is unavailable', () => {
+    const participant = { title: 'Foo Bar' };
+
+    assert.strictEqual(getParticipantName(participant), 'Foo Bar');
+  });
+});