diff --git a/tests/cts/tethering/Android.bp b/tests/cts/tethering/Android.bp
new file mode 100644
index 0000000000..7b16879f19
--- /dev/null
+++ b/tests/cts/tethering/Android.bp
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+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+android_test {
+ name: "CtsTetheringTest",
+ defaults: ["cts_defaults"],
+
+ libs: [
+ "android.test.base.stubs",
+ ],
+
+ srcs: [
+ "src/**/*.java",
+ ],
+
+ static_libs: [
+ "compatibility-device-util-axt",
+ "ctstestrunner-axt",
+ "junit",
+ "junit-params",
+ ],
+
+ // Change to system current when TetheringManager move to bootclass path.
+ platform_apis: true,
+
+ // Tag this module as a cts test artifact
+ test_suites: [
+ "cts",
+ "general-tests",
+ ],
+
+}
diff --git a/tests/cts/tethering/AndroidManifest.xml b/tests/cts/tethering/AndroidManifest.xml
new file mode 100644
index 0000000000..665002e462
--- /dev/null
+++ b/tests/cts/tethering/AndroidManifest.xml
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diff --git a/tests/cts/tethering/AndroidTest.xml b/tests/cts/tethering/AndroidTest.xml
new file mode 100644
index 0000000000..217d53a5f1
--- /dev/null
+++ b/tests/cts/tethering/AndroidTest.xml
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+
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diff --git a/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java b/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java
new file mode 100644
index 0000000000..9efb8f38ac
--- /dev/null
+++ b/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.tethering.test;
+
+import static org.junit.Assert.fail;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+import android.os.ConditionVariable;
+
+import androidx.test.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+@RunWith(AndroidJUnit4.class)
+public class TetheringManagerTest {
+
+ private Context mContext;
+
+ private ConnectivityManager mCM;
+
+ private TetherChangeReceiver mTetherChangeReceiver;
+
+ private String[] mTetheredList;
+
+ private static final int DEFAULT_TIMEOUT_MS = 60_000;
+
+ @Before
+ public void setUp() throws Exception {
+ InstrumentationRegistry.getInstrumentation()
+ .getUiAutomation()
+ .adoptShellPermissionIdentity();
+ mContext = InstrumentationRegistry.getContext();
+ mCM = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
+ mTetherChangeReceiver = new TetherChangeReceiver();
+ final IntentFilter filter = new IntentFilter(
+ ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
+ final Intent intent = mContext.registerReceiver(mTetherChangeReceiver, filter);
+ if (intent != null) mTetherChangeReceiver.onReceive(null, intent);
+ }
+
+ @After
+ public void tearDown() throws Exception {
+ mContext.unregisterReceiver(mTetherChangeReceiver);
+ InstrumentationRegistry.getInstrumentation()
+ .getUiAutomation()
+ .dropShellPermissionIdentity();
+ }
+
+ private class TetherChangeReceiver extends BroadcastReceiver {
+ private class TetherState {
+ final ArrayList mAvailable;
+ final ArrayList mActive;
+ final ArrayList mErrored;
+
+ TetherState(Intent intent) {
+ mAvailable = intent.getStringArrayListExtra(
+ ConnectivityManager.EXTRA_AVAILABLE_TETHER);
+ mActive = intent.getStringArrayListExtra(
+ ConnectivityManager.EXTRA_ACTIVE_TETHER);
+ mErrored = intent.getStringArrayListExtra(
+ ConnectivityManager.EXTRA_ERRORED_TETHER);
+ }
+ }
+
+ @Override
+ public void onReceive(Context content, Intent intent) {
+ String action = intent.getAction();
+ if (action.equals(ConnectivityManager.ACTION_TETHER_STATE_CHANGED)) {
+ mResult.add(new TetherState(intent));
+ }
+ }
+
+ public final LinkedBlockingQueue mResult = new LinkedBlockingQueue<>();
+
+ // This method expects either an event where one of the interfaces is active, or an event
+ // where one of the interface is available followed by one where one of the interfaces is
+ // active.
+ public void expectActiveTethering(String[] ifaceRegexs) {
+ TetherState state = pollAndAssertNoError(DEFAULT_TIMEOUT_MS);
+ if (state == null) fail("Do not receive tethering state change broadcast");
+
+ if (isIfaceActive(ifaceRegexs, state)) return;
+
+ if (isIfaceAvailable(ifaceRegexs, state)) {
+ state = pollAndAssertNoError(DEFAULT_TIMEOUT_MS);
+ if (isIfaceActive(ifaceRegexs, state)) return;
+ }
+
+ fail("Tethering is not actived, available ifaces: " + state.mAvailable.toString()
+ + ", active ifaces: " + state.mActive.toString());
+ }
+
+ private TetherState pollAndAssertNoError(final int timeout) {
+ final TetherState state = pollTetherState(timeout);
+ assertNoErroredIfaces(state);
+ return state;
+ }
+
+ private TetherState pollTetherState(final int timeout) {
+ try {
+ return mResult.poll(timeout, TimeUnit.MILLISECONDS);
+ } catch (InterruptedException e) {
+ fail("No result after " + timeout + " ms");
+ return null;
+ }
+ }
+
+ private boolean isIfaceActive(final String[] ifaceRegexs, final TetherState state) {
+ return isIfaceMatch(ifaceRegexs, state.mActive);
+ }
+
+ private boolean isIfaceAvailable(final String[] ifaceRegexs, final TetherState state) {
+ return isIfaceMatch(ifaceRegexs, state.mAvailable);
+ }
+
+ // This method requires a broadcast to have been recorded iff the timeout is non-zero.
+ public void expectNoActiveTethering(final int timeout) {
+ final TetherState state = pollAndAssertNoError(timeout);
+
+ if (state == null) {
+ if (timeout != 0) {
+ fail("Do not receive tethering state change broadcast");
+ }
+ return;
+ }
+
+ assertNoActiveIfaces(state);
+
+ for (final TetherState ts : mResult) {
+ assertNoErroredIfaces(ts);
+
+ assertNoActiveIfaces(ts);
+ }
+ }
+
+ private void assertNoErroredIfaces(final TetherState state) {
+ if (state == null || state.mErrored == null) return;
+
+ if (state.mErrored.size() > 0) {
+ fail("Found failed tethering interfaces: " + state.mErrored.toArray());
+ }
+ }
+
+ private void assertNoActiveIfaces(final TetherState state) {
+ if (state.mActive != null && state.mActive.size() > 0) {
+ fail("Found active tethering interface: " + state.mActive.toArray());
+ }
+ }
+ }
+
+ private class OnStartTetheringCallback extends
+ ConnectivityManager.OnStartTetheringCallback {
+ @Override
+ public void onTetheringStarted() {
+ // Do nothing, TetherChangeReceiver will wait until it receives the broadcast.
+ }
+
+ @Override
+ public void onTetheringFailed() {
+ fail("startTethering fail");
+ }
+ }
+
+ private static boolean isIfaceMatch(final String[] ifaceRegexs,
+ final ArrayList ifaces) {
+ if (ifaceRegexs == null) fail("ifaceRegexs should not be null");
+
+ if (ifaces == null) return false;
+
+ for (String s : ifaces) {
+ for (String regex : ifaceRegexs) {
+ if (s.matches(regex)) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ @Test
+ public void testStartTetheringWithStateChangeBroadcast() throws Exception {
+ if (!mCM.isTetheringSupported()) return;
+
+ final String[] wifiRegexs = mCM.getTetherableWifiRegexs();
+ if (wifiRegexs.length == 0) return;
+
+ mTetherChangeReceiver.expectNoActiveTethering(0 /** timeout */);
+
+ final OnStartTetheringCallback startTetheringCallback = new OnStartTetheringCallback();
+ mCM.startTethering(ConnectivityManager.TETHERING_WIFI, true, startTetheringCallback);
+ mTetherChangeReceiver.expectActiveTethering(wifiRegexs);
+
+ mCM.stopTethering(ConnectivityManager.TETHERING_WIFI);
+ mTetherChangeReceiver.expectNoActiveTethering(DEFAULT_TIMEOUT_MS);
+ }
+}