Merge "Speed up IpClientIntegrationTest."

        mNetworkObserverRegistry.register(mNetd);

        mIpc = new IpClient(mContext, mIfaceName, mCb, mNetworkObserverRegistry,

                mNetworkStackServiceManager, mDependencies);

        // Tell the IpMemoryStore immediately to answer any question about network attributes with a

        // null response. Otherwise, the DHCP client will wait for two seconds before starting,

        // while its query to the IpMemoryStore times out.

        // This does not affect any test that makes the mock memory store return results, because

        // unlike when(), it is documented that doAnswer() can be called more than once, to change

        // the behaviour of a mock in the middle of a test.

        doAnswer(invocation -> {

            final String l2Key = invocation.getArgument(0);

            ((OnNetworkAttributesRetrievedListener) invocation.getArgument(1))

                    .onNetworkAttributesRetrieved(new Status(SUCCESS), l2Key, null);

            return null;

        }).when(mIpMemoryStore).retrieveNetworkAttributes(any(), any());

        disableIpv6ProvisioningDelays();

    }

    private boolean packetContainsExpectedField(final byte[] packet, final int offset,

        return packet;

    }

    private void disableRouterSolicitationDelay() throws Exception {

        // Speed up the test by removing router_solicitation_delay.

    private void disableIpv6ProvisioningDelays() throws Exception {

        // Speed up the test by disabling DAD and removing router_solicitation_delay.

        // We don't need to restore the default value because the interface is removed in tearDown.

        // TODO: speed up further by not waiting for RA but keying off first IPv6 packet.

        // TODO: speed up further by not waiting for RS but keying off first IPv6 packet.

        mNetd.setProcSysNet(INetd.IPV6, INetd.CONF, mIfaceName, "router_solicitation_delay", "0");

        mNetd.setProcSysNet(INetd.IPV6, INetd.CONF, mIfaceName, "dad_transmits", "0");

    }

    @Test

    public void testRaRdnss() throws Exception {

        disableRouterSolicitationDelay();

        ProvisioningConfiguration config = new ProvisioningConfiguration.Builder()

                .withoutIpReachabilityMonitor()

                .withoutIPv4()

    public void testPref64Option() throws Exception {

        assumeTrue(ConstantsShim.VERSION > Build.VERSION_CODES.Q);

        disableRouterSolicitationDelay();

        ProvisioningConfiguration config = new ProvisioningConfiguration.Builder()

                .withoutIpReachabilityMonitor()

                .withoutIPv4()

        // may be sufficient to call waitForIdle to see if IpClient has seen the address.

        addIpAddressAndWaitForIt(mIfaceName);

        disableRouterSolicitationDelay();

        ProvisioningConfiguration config = new ProvisioningConfiguration.Builder()

                .withoutIpReachabilityMonitor()

                .build();