### Question:
MockApnsServerBuilder extends BaseHttp2ServerBuilder<MockApnsServer> { @Override public MockApnsServerBuilder setMaxConcurrentStreams(final int maxConcurrentStreams) { super.setMaxConcurrentStreams(maxConcurrentStreams); return this; }  @Override MockApnsServerBuilder setServerCredentials(final File certificatePemFile, final File privateKeyPkcs8File, final String privateKeyPassword); @Override MockApnsServerBuilder setServerCredentials(final InputStream certificatePemInputStream, final InputStream privateKeyPkcs8InputStream, final String privateKeyPassword); @Override MockApnsServerBuilder setServerCredentials(final X509Certificate[] certificates, final PrivateKey privateKey, final String privateKeyPassword); @Override MockApnsServerBuilder setTrustedClientCertificateChain(final File certificatePemFile); @Override MockApnsServerBuilder setTrustedClientCertificateChain(final InputStream certificateInputStream); @Override MockApnsServerBuilder setTrustedServerCertificateChain(final X509Certificate... certificates); @Override MockApnsServerBuilder setEventLoopGroup(final EventLoopGroup eventLoopGroup); @Override MockApnsServerBuilder setMaxConcurrentStreams(final int maxConcurrentStreams); @Override MockApnsServerBuilder setUseAlpn(final boolean useAlpn); MockApnsServerBuilder setHandlerFactory(final PushNotificationHandlerFactory handlerFactory); MockApnsServerBuilder setListener(final MockApnsServerListener listener); @Override MockApnsServer build();  }### Answer:
@Test void testSetMaxConcurrentStreams() { new MockApnsServerBuilder().setMaxConcurrentStreams(1); }
@Test void testSetNegativeMaxConcurrentStreams() { assertThrows(IllegalArgumentException.class, () -> new MockApnsServerBuilder().setMaxConcurrentStreams(-7)); }