diff --git a/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt b/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
index c505cef..ccc9416 100644
--- a/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
+++ b/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
@@ -29,9 +29,9 @@
 import android.net.NattKeepalivePacketData
 import android.net.Network
 import android.net.NetworkAgent
+import android.net.NetworkAgentConfig
 import android.net.NetworkAgent.INVALID_NETWORK
 import android.net.NetworkAgent.VALID_NETWORK
-import android.net.NetworkAgentConfig
 import android.net.NetworkCapabilities
 import android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET
 import android.net.NetworkCapabilities.NET_CAPABILITY_NOT_CONGESTED
@@ -46,9 +46,17 @@
 import android.net.NetworkCapabilities.TRANSPORT_VPN
 import android.net.NetworkInfo
 import android.net.NetworkProvider
+import android.net.NetworkReleasedException
 import android.net.NetworkRequest
 import android.net.NetworkScore
 import android.net.RouteInfo
+import android.net.QosCallback
+import android.net.QosCallbackException
+import android.net.QosCallback.QosCallbackRegistrationException
+import android.net.QosFilter
+import android.net.QosSession
+import android.net.QosSessionAttributes
+import android.net.QosSocketInfo
 import android.net.SocketKeepalive
 import android.net.Uri
 import android.net.VpnManager
@@ -59,12 +67,17 @@
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnNetworkCreated
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnNetworkDestroyed
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnNetworkUnwanted
+import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnRegisterQosCallback
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnRemoveKeepalivePacketFilter
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnSaveAcceptUnvalidated
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnSignalStrengthThresholdsUpdated
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnStartSocketKeepalive
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnStopSocketKeepalive
+import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnUnregisterQosCallback
 import android.net.cts.NetworkAgentTest.TestableNetworkAgent.CallbackEntry.OnValidationStatus
+import android.net.cts.NetworkAgentTest.TestableQosCallback.CallbackEntry.OnError
+import android.net.cts.NetworkAgentTest.TestableQosCallback.CallbackEntry.OnQosSessionAvailable
+import android.net.cts.NetworkAgentTest.TestableQosCallback.CallbackEntry.OnQosSessionLost
 import android.os.Build
 import android.os.Handler
 import android.os.HandlerThread
@@ -72,6 +85,7 @@
 import android.os.Message
 import android.os.SystemClock
 import android.telephony.TelephonyManager
+import android.telephony.data.EpsBearerQosSessionAttributes
 import android.util.DebugUtils.valueToString
 import androidx.test.InstrumentationRegistry
 import com.android.compatibility.common.util.SystemUtil.runWithShellPermissionIdentity
@@ -97,9 +111,13 @@
 import org.mockito.Mockito.mock
 import org.mockito.Mockito.timeout
 import org.mockito.Mockito.verify
+import java.net.InetAddress
+import java.net.InetSocketAddress
+import java.net.Socket
 import java.time.Duration
 import java.util.Arrays
 import java.util.UUID
+import java.util.concurrent.Executors
 import kotlin.test.assertEquals
 import kotlin.test.assertFailsWith
 import kotlin.test.assertFalse
@@ -143,7 +161,7 @@
     private val LOCAL_IPV4_ADDRESS = InetAddresses.parseNumericAddress("192.0.2.1")
     private val REMOTE_IPV4_ADDRESS = InetAddresses.parseNumericAddress("192.0.2.2")
 
-    private val mCM = realContext.getSystemService(ConnectivityManager::class.java)
+    private val mCM = realContext.getSystemService(ConnectivityManager::class.java)!!
     private val mHandlerThread = HandlerThread("${javaClass.simpleName} handler thread")
     private val mFakeConnectivityService = FakeConnectivityService()
 
@@ -152,6 +170,7 @@
 
     private val agentsToCleanUp = mutableListOf<NetworkAgent>()
     private val callbacksToCleanUp = mutableListOf<TestableNetworkCallback>()
+    private var qosTestSocket: Socket? = null
 
     @Before
     fun setUp() {
@@ -163,6 +182,7 @@
     fun tearDown() {
         agentsToCleanUp.forEach { it.unregister() }
         callbacksToCleanUp.forEach { mCM.unregisterNetworkCallback(it) }
+        qosTestSocket?.close()
         mHandlerThread.quitSafely()
         instrumentation.getUiAutomation().dropShellPermissionIdentity()
     }
@@ -228,6 +248,11 @@
             data class OnSignalStrengthThresholdsUpdated(val thresholds: IntArray) : CallbackEntry()
             object OnNetworkCreated : CallbackEntry()
             object OnNetworkDestroyed : CallbackEntry()
+            data class OnRegisterQosCallback(
+                val callbackId: Int,
+                val filter: QosFilter
+            ) : CallbackEntry()
+            data class OnUnregisterQosCallback(val callbackId: Int) : CallbackEntry()
         }
 
         override fun onBandwidthUpdateRequested() {
@@ -276,6 +301,14 @@
             }
         }
 
+        override fun onQosCallbackRegistered(qosCallbackId: Int, filter: QosFilter) {
+            history.add(OnRegisterQosCallback(qosCallbackId, filter))
+        }
+
+        override fun onQosCallbackUnregistered(qosCallbackId: Int) {
+            history.add(OnUnregisterQosCallback(qosCallbackId))
+        }
+
         override fun onValidationStatus(status: Int, uri: Uri?) {
             history.add(OnValidationStatus(status, uri))
         }
@@ -307,6 +340,12 @@
             return foundCallback
         }
 
+        inline fun <reified T : CallbackEntry> expectCallback(valid: (T) -> Boolean) {
+            val foundCallback = history.poll(DEFAULT_TIMEOUT_MS)
+            assertTrue(foundCallback is T, "Expected ${T::class} but found $foundCallback")
+            assertTrue(valid(foundCallback), "Unexpected callback : $foundCallback")
+        }
+
         inline fun <reified T : CallbackEntry> eventuallyExpect() =
                 history.poll(DEFAULT_TIMEOUT_MS) { it is T }.also {
                     assertNotNull(it, "Callback ${T::class} not received")
@@ -390,7 +429,7 @@
         initialConfig: NetworkAgentConfig? = null,
         expectedInitSignalStrengthThresholds: IntArray? = intArrayOf()
     ): Pair<TestableNetworkAgent, TestableNetworkCallback> {
-        val callback = TestableNetworkCallback(timeoutMs = DEFAULT_TIMEOUT_MS)
+        val callback = TestableNetworkCallback()
         // Ensure this NetworkAgent is never unneeded by filing a request with its specifier.
         requestNetwork(makeTestNetworkRequest(specifier = specifier), callback)
         val agent = createNetworkAgent(context, specifier, initialConfig = initialConfig)
@@ -651,7 +690,7 @@
         assertFalse(vpnNc.hasCapability(NET_CAPABILITY_NOT_VPN))
         assertTrue(hasAllTransports(vpnNc, defaultNetworkTransports),
                 "VPN transports ${Arrays.toString(vpnNc.transportTypes)}" +
-                " lacking transports from ${Arrays.toString(defaultNetworkTransports)}")
+                        " lacking transports from ${Arrays.toString(defaultNetworkTransports)}")
 
         // Check that when no underlying networks are announced the underlying transport disappears.
         agent.setUnderlyingNetworks(listOf<Network>())
@@ -934,4 +973,251 @@
 
         // tearDown() will unregister the requests and agents
     }
+
+    private class TestableQosCallback : QosCallback() {
+        val history = ArrayTrackRecord<CallbackEntry>().newReadHead()
+
+        sealed class CallbackEntry {
+            data class OnQosSessionAvailable(val sess: QosSession, val attr: QosSessionAttributes)
+                : CallbackEntry()
+            data class OnQosSessionLost(val sess: QosSession)
+                : CallbackEntry()
+            data class OnError(val ex: QosCallbackException)
+                : CallbackEntry()
+        }
+
+        override fun onQosSessionAvailable(sess: QosSession, attr: QosSessionAttributes) {
+            history.add(OnQosSessionAvailable(sess, attr))
+        }
+
+        override fun onQosSessionLost(sess: QosSession) {
+            history.add(OnQosSessionLost(sess))
+        }
+
+        override fun onError(ex: QosCallbackException) {
+            history.add(OnError(ex))
+        }
+
+        inline fun <reified T : CallbackEntry> expectCallback(): T {
+            val foundCallback = history.poll(DEFAULT_TIMEOUT_MS)
+            assertTrue(foundCallback is T, "Expected ${T::class} but found $foundCallback")
+            return foundCallback
+        }
+
+        inline fun <reified T : CallbackEntry> expectCallback(valid: (T) -> Boolean) {
+            val foundCallback = history.poll(DEFAULT_TIMEOUT_MS)
+            assertTrue(foundCallback is T, "Expected ${T::class} but found $foundCallback")
+            assertTrue(valid(foundCallback), "Unexpected callback : $foundCallback")
+        }
+
+        fun assertNoCallback() {
+            assertNull(history.poll(NO_CALLBACK_TIMEOUT),
+                    "Callback received")
+        }
+    }
+
+    private fun setupForQosCallbackTesting(): Pair<TestableNetworkAgent, Socket> {
+        val request = NetworkRequest.Builder()
+                .clearCapabilities()
+                .addTransportType(TRANSPORT_TEST)
+                .build()
+
+        val callback = TestableNetworkCallback(timeoutMs = DEFAULT_TIMEOUT_MS)
+        requestNetwork(request, callback)
+        val (agent, _) = createConnectedNetworkAgent()
+
+        qosTestSocket = assertNotNull(agent.network?.socketFactory?.createSocket()).also {
+            it.bind(InetSocketAddress(InetAddress.getLoopbackAddress(), 0))
+        }
+        return Pair(agent, qosTestSocket!!)
+    }
+
+    @Test
+    fun testQosCallbackRegisterWithUnregister() {
+        val (agent, socket) = setupForQosCallbackTesting()
+
+        val qosCallback = TestableQosCallback()
+        var callbackId = -1
+        Executors.newSingleThreadExecutor().let { executor ->
+            try {
+                val info = QosSocketInfo(agent.network!!, socket)
+                mCM.registerQosCallback(info, executor, qosCallback)
+                callbackId = agent.expectCallback<OnRegisterQosCallback>().callbackId
+
+                assertFailsWith<QosCallbackRegistrationException>(
+                        "The same callback cannot be " +
+                        "registered more than once without first being unregistered") {
+                    mCM.registerQosCallback(info, executor, qosCallback)
+                }
+            } finally {
+                socket.close()
+                mCM.unregisterQosCallback(qosCallback)
+                agent.expectCallback<OnUnregisterQosCallback> { it.callbackId == callbackId }
+                executor.shutdown()
+            }
+        }
+    }
+
+    @Test
+    fun testQosCallbackOnQosSession() {
+        val (agent, socket) = setupForQosCallbackTesting()
+        val qosCallback = TestableQosCallback()
+        Executors.newSingleThreadExecutor().let { executor ->
+            try {
+                val info = QosSocketInfo(agent.network!!, socket)
+                mCM.registerQosCallback(info, executor, qosCallback)
+                val callbackId = agent.expectCallback<OnRegisterQosCallback>().callbackId
+
+                val uniqueSessionId = 4294967397
+                val sessId = 101
+
+                val attributes = createEpsAttributes(5)
+                assertEquals(attributes.qosIdentifier, 5)
+                agent.sendQosSessionAvailable(callbackId, sessId, attributes)
+                qosCallback.expectCallback<OnQosSessionAvailable> {
+                            it.sess.sessionId == sessId && it.sess.uniqueId == uniqueSessionId &&
+                                it.sess.sessionType == QosSession.TYPE_EPS_BEARER
+                        }
+
+                agent.sendQosSessionLost(callbackId, sessId, QosSession.TYPE_EPS_BEARER)
+                qosCallback.expectCallback<OnQosSessionLost> {
+                            it.sess.sessionId == sessId && it.sess.uniqueId == uniqueSessionId &&
+                                it.sess.sessionType == QosSession.TYPE_EPS_BEARER
+                        }
+
+                // Make sure that we don't get more qos callbacks
+                mCM.unregisterQosCallback(qosCallback)
+                agent.expectCallback<OnUnregisterQosCallback>()
+
+                agent.sendQosSessionLost(callbackId, sessId, QosSession.TYPE_EPS_BEARER)
+                qosCallback.assertNoCallback()
+            } finally {
+                socket.close()
+
+                // safety precaution
+                mCM.unregisterQosCallback(qosCallback)
+
+                executor.shutdown()
+            }
+        }
+    }
+
+    @Test
+    fun testQosCallbackOnError() {
+        val (agent, socket) = setupForQosCallbackTesting()
+        val qosCallback = TestableQosCallback()
+        Executors.newSingleThreadExecutor().let { executor ->
+            try {
+                val info = QosSocketInfo(agent.network!!, socket)
+                mCM.registerQosCallback(info, executor, qosCallback)
+                val callbackId = agent.expectCallback<OnRegisterQosCallback>().callbackId
+
+                val sessId = 101
+                val attributes = createEpsAttributes()
+
+                // Double check that this is wired up and ready to go
+                agent.sendQosSessionAvailable(callbackId, sessId, attributes)
+                qosCallback.expectCallback<OnQosSessionAvailable>()
+
+                // Check that onError is coming through correctly
+                agent.sendQosCallbackError(callbackId,
+                        QosCallbackException.EX_TYPE_FILTER_NOT_SUPPORTED)
+                qosCallback.expectCallback<OnError> {
+                    it.ex.cause is UnsupportedOperationException
+                }
+
+                // Ensure that when an error occurs the callback was also unregistered
+                agent.sendQosSessionLost(callbackId, sessId, QosSession.TYPE_EPS_BEARER)
+                qosCallback.assertNoCallback()
+            } finally {
+                socket.close()
+
+                // Make sure that the callback is fully unregistered
+                mCM.unregisterQosCallback(qosCallback)
+
+                executor.shutdown()
+            }
+        }
+    }
+
+    @Test
+    fun testQosCallbackIdsAreMappedCorrectly() {
+        val (agent, socket) = setupForQosCallbackTesting()
+        val qosCallback1 = TestableQosCallback()
+        val qosCallback2 = TestableQosCallback()
+        Executors.newSingleThreadExecutor().let { executor ->
+            try {
+                val info = QosSocketInfo(agent.network!!, socket)
+                mCM.registerQosCallback(info, executor, qosCallback1)
+                val callbackId1 = agent.expectCallback<OnRegisterQosCallback>().callbackId
+
+                mCM.registerQosCallback(info, executor, qosCallback2)
+                val callbackId2 = agent.expectCallback<OnRegisterQosCallback>().callbackId
+
+                val sessId1 = 101
+                val attributes1 = createEpsAttributes(1)
+
+                // Check #1
+                agent.sendQosSessionAvailable(callbackId1, sessId1, attributes1)
+                qosCallback1.expectCallback<OnQosSessionAvailable>()
+                qosCallback2.assertNoCallback()
+
+                // Check #2
+                val sessId2 = 102
+                val attributes2 = createEpsAttributes(2)
+                agent.sendQosSessionAvailable(callbackId2, sessId2, attributes2)
+                qosCallback1.assertNoCallback()
+                qosCallback2.expectCallback<OnQosSessionAvailable> { sessId2 == it.sess.sessionId }
+            } finally {
+                socket.close()
+
+                // Make sure that the callback is fully unregistered
+                mCM.unregisterQosCallback(qosCallback1)
+                mCM.unregisterQosCallback(qosCallback2)
+
+                executor.shutdown()
+            }
+        }
+    }
+
+    @Test
+    fun testQosCallbackWhenNetworkReleased() {
+        val (agent, socket) = setupForQosCallbackTesting()
+        Executors.newSingleThreadExecutor().let { executor ->
+            try {
+                val qosCallback1 = TestableQosCallback()
+                val qosCallback2 = TestableQosCallback()
+                try {
+                    val info = QosSocketInfo(agent.network!!, socket)
+                    mCM.registerQosCallback(info, executor, qosCallback1)
+                    mCM.registerQosCallback(info, executor, qosCallback2)
+                    agent.unregister()
+
+                    qosCallback1.expectCallback<OnError> {
+                        it.ex.cause is NetworkReleasedException
+                    }
+
+                    qosCallback2.expectCallback<OnError> {
+                        it.ex.cause is NetworkReleasedException
+                    }
+                } finally {
+                    socket.close()
+                    mCM.unregisterQosCallback(qosCallback1)
+                    mCM.unregisterQosCallback(qosCallback2)
+                }
+            } finally {
+                socket.close()
+                executor.shutdown()
+            }
+        }
+    }
+
+    private fun createEpsAttributes(qci: Int = 1): EpsBearerQosSessionAttributes {
+        val remoteAddresses = ArrayList<InetSocketAddress>()
+        remoteAddresses.add(InetSocketAddress("2001:db8::123", 80))
+        return EpsBearerQosSessionAttributes(
+                qci, 2, 3, 4, 5,
+                remoteAddresses
+        )
+    }
 }