Receive support for Sender Key

Co-authored-by: Fedor Indutny <79877362+indutny-signal@users.noreply.github.com>

ts/test-electron/util/isByteBufferEmpty_test.ts

@@ -0,0 +1,31 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { isByteBufferEmpty } from '../../util/isByteBufferEmpty';
+
+describe('isByteBufferEmpty', () => {
+  it('returns true for undefined', () => {
+    assert.isTrue(isByteBufferEmpty(undefined));
+  });
+
+  it('returns true for object missing limit', () => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const brokenByteBuffer: any = {};
+
+    assert.isTrue(isByteBufferEmpty(brokenByteBuffer));
+  });
+
+  it('returns true for object limit', () => {
+    const emptyByteBuffer = new window.dcodeIO.ByteBuffer(0);
+
+    assert.isTrue(isByteBufferEmpty(emptyByteBuffer));
+  });
+
+  it('returns false for object limit', () => {
+    const byteBuffer = window.dcodeIO.ByteBuffer.wrap('AABBCC', 'hex');
+
+    assert.isFalse(isByteBufferEmpty(byteBuffer));
+  });
+});