Fix flakes due to networks obtained via sync APIs
After reconnectWifiIfSupported is called, it is possible that
ConnectivityManager#getAllNetworks does not return the Network, as this
is mixing network callbacks and synchronous calls which is racy (as per
ConnectivityManager javadoc).
Ensure that networks that are reconnected in the test, wifi and
cellular, are obtained through network callbacks through CtsNetUtils.
Other networks are still obtained through the synchronous call, as they
should not change during the test, and there would be no non-racy way to
obtain them otherwise anyway as they are not guaranteed to be connected.
Bug: 328331492
Test: atest
(cherry picked from https://android-review.googlesource.com/q/commit:f8999e32e1e6de820ee62ee3a8becce07c512595)
Merged-In: I5a511c87c64fde0276aecd6ff6599815fa08e437
Change-Id: I5a511c87c64fde0276aecd6ff6599815fa08e437
diff --git a/tests/cts/net/src/android/net/cts/MultinetworkApiTest.java b/tests/cts/net/src/android/net/cts/MultinetworkApiTest.java
index bca18f5..7ab73c2 100644
--- a/tests/cts/net/src/android/net/cts/MultinetworkApiTest.java
+++ b/tests/cts/net/src/android/net/cts/MultinetworkApiTest.java
@@ -16,10 +16,14 @@
package android.net.cts;
+import static android.content.pm.PackageManager.FEATURE_TELEPHONY;
+import static android.content.pm.PackageManager.FEATURE_WIFI;
import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
+import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
import static android.provider.DeviceConfig.NAMESPACE_CONNECTIVITY;
import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;
@@ -34,17 +38,21 @@
import android.platform.test.annotations.AppModeFull;
import android.system.ErrnoException;
import android.system.OsConstants;
+import android.util.ArraySet;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.platform.app.InstrumentationRegistry;
import com.android.testutils.DeviceConfigRule;
+import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
+import java.util.Set;
+
@RunWith(AndroidJUnit4.class)
public class MultinetworkApiTest {
@Rule
@@ -74,9 +82,8 @@
private ContentResolver mCR;
private ConnectivityManager mCM;
private CtsNetUtils mCtsNetUtils;
- private String mOldMode;
- private String mOldDnsSpecifier;
private Context mContext;
+ private Network mRequestedCellNetwork;
@Before
public void setUp() throws Exception {
@@ -86,9 +93,16 @@
mCtsNetUtils = new CtsNetUtils(mContext);
}
+ @After
+ public void tearDown() {
+ if (mCtsNetUtils.cellConnectAttempted()) {
+ mCtsNetUtils.disconnectFromCell();
+ }
+ }
+
@Test
- public void testGetaddrinfo() throws ErrnoException {
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ public void testGetaddrinfo() throws Exception {
+ for (Network network : getTestableNetworks()) {
int errno = runGetaddrinfoCheck(network.getNetworkHandle());
if (errno != 0) {
throw new ErrnoException(
@@ -99,12 +113,12 @@
@Test
@AppModeFull(reason = "CHANGE_NETWORK_STATE permission can't be granted to instant apps")
- public void testSetprocnetwork() throws ErrnoException {
+ public void testSetprocnetwork() throws Exception {
// Hopefully no prior test in this process space has set a default network.
assertNull(mCM.getProcessDefaultNetwork());
assertEquals(0, NetworkUtils.getBoundNetworkForProcess());
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ for (Network network : getTestableNetworks()) {
mCM.setProcessDefaultNetwork(null);
assertNull(mCM.getProcessDefaultNetwork());
@@ -123,7 +137,7 @@
mCM.setProcessDefaultNetwork(null);
}
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ for (Network network : getTestableNetworks()) {
NetworkUtils.bindProcessToNetwork(0);
assertNull(mCM.getBoundNetworkForProcess());
@@ -143,8 +157,8 @@
@Test
@AppModeFull(reason = "CHANGE_NETWORK_STATE permission can't be granted to instant apps")
- public void testSetsocknetwork() throws ErrnoException {
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ public void testSetsocknetwork() throws Exception {
+ for (Network network : getTestableNetworks()) {
int errno = runSetsocknetwork(network.getNetworkHandle());
if (errno != 0) {
throw new ErrnoException(
@@ -154,8 +168,8 @@
}
@Test
- public void testNativeDatagramTransmission() throws ErrnoException {
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ public void testNativeDatagramTransmission() throws Exception {
+ for (Network network : getTestableNetworks()) {
int errno = runDatagramCheck(network.getNetworkHandle());
if (errno != 0) {
throw new ErrnoException(
@@ -165,7 +179,7 @@
}
@Test
- public void testNoSuchNetwork() {
+ public void testNoSuchNetwork() throws Exception {
final Network eNoNet = new Network(54321);
assertNull(mCM.getNetworkInfo(eNoNet));
@@ -178,9 +192,9 @@
}
@Test
- public void testNetworkHandle() {
+ public void testNetworkHandle() throws Exception {
// Test Network -> NetworkHandle -> Network results in the same Network.
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ for (Network network : getTestableNetworks()) {
long networkHandle = network.getNetworkHandle();
Network newNetwork = Network.fromNetworkHandle(networkHandle);
assertEquals(newNetwork, network);
@@ -203,9 +217,7 @@
@Test
public void testResNApi() throws Exception {
- final Network[] testNetworks = mCtsNetUtils.getTestableNetworks();
-
- for (Network network : testNetworks) {
+ for (Network network : getTestableNetworks()) {
// Throws AssertionError directly in jni function if test fail.
runResNqueryCheck(network.getNetworkHandle());
runResNsendCheck(network.getNetworkHandle());
@@ -241,7 +253,7 @@
// b/144521720
try {
mCtsNetUtils.setPrivateDnsStrictMode(GOOGLE_PRIVATE_DNS_SERVER);
- for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ for (Network network : getTestableNetworks()) {
// Wait for private DNS setting to propagate.
mCtsNetUtils.awaitPrivateDnsSetting("NxDomain test wait private DNS setting timeout",
network, GOOGLE_PRIVATE_DNS_SERVER, true);
@@ -251,4 +263,44 @@
mCtsNetUtils.restorePrivateDnsSetting();
}
}
+
+ /**
+ * Get all testable Networks with internet capability.
+ */
+ private Set<Network> getTestableNetworks() throws InterruptedException {
+ // Obtain cell and Wi-Fi through CtsNetUtils (which uses NetworkCallbacks), as they may have
+ // just been reconnected by the test using NetworkCallbacks, so synchronous calls may not
+ // yet return them (synchronous calls and callbacks should not be mixed for a given
+ // Network).
+ final Set<Network> testableNetworks = new ArraySet<>();
+ if (mContext.getPackageManager().hasSystemFeature(FEATURE_TELEPHONY)) {
+ if (!mCtsNetUtils.cellConnectAttempted()) {
+ mRequestedCellNetwork = mCtsNetUtils.connectToCell();
+ }
+ assertNotNull("Cell network requested but not obtained", mRequestedCellNetwork);
+ testableNetworks.add(mRequestedCellNetwork);
+ }
+
+ if (mContext.getPackageManager().hasSystemFeature(FEATURE_WIFI)) {
+ testableNetworks.add(mCtsNetUtils.ensureWifiConnected());
+ }
+
+ // Obtain other networks through the synchronous API, if any.
+ for (Network network : mCtsNetUtils.getTestableNetworks()) {
+ final NetworkCapabilities nc = mCM.getNetworkCapabilities(network);
+ if (nc != null
+ && !nc.hasTransport(TRANSPORT_WIFI)
+ && !nc.hasTransport(TRANSPORT_CELLULAR)) {
+ testableNetworks.add(network);
+ }
+ }
+
+ // In practice this should not happen as getTestableNetworks throws if there is no network
+ // at all.
+ assertFalse("This device does not support WiFi nor cell data, and does not have any other "
+ + "network connected. This test requires at least one internet-providing "
+ + "network.",
+ testableNetworks.isEmpty());
+ return testableNetworks;
+ }
}