Fix expectCallback does not fail when no callback received

This hides 3 bugs where,
  1. In Android S, onNetworkRequested is no longer broadcasted
     by ConnectivityService in any condition. However, the test
     still passes since assertion does not fail when no callback
     received. Ignore the test on S+ devices since the behavior
     changed on S or later devices.
  2. Test network agent is not registered, but the test still
     passes.
  3. Test network agent does not fulfill the request that kept
     the network up, so the test fails since the test network
     is not needed and be torn down.

Test: android.net.NetworkProviderTest on R/S device
Bug: 189074532
Merged-In: I627dcd0f57b6ef4197d16e6c1ec0c53e675ab055
Change-Id: I627dcd0f57b6ef4197d16e6c1ec0c53e675ab055
  (cherry-picked from aosp/1731450)

tests/common/java/android/net/NetworkProviderTest.kt

@@ -18,6 +18,7 @@ package android.net
 
 import android.app.Instrumentation
 import android.content.Context
+import android.net.NetworkCapabilities.NET_CAPABILITY_TRUSTED
 import android.net.NetworkCapabilities.TRANSPORT_TEST
 import android.net.NetworkProviderTest.TestNetworkCallback.CallbackEntry.OnUnavailable
 import android.net.NetworkProviderTest.TestNetworkProvider.CallbackEntry.OnNetworkRequestWithdrawn
@@ -25,14 +26,18 @@ import android.net.NetworkProviderTest.TestNetworkProvider.CallbackEntry.OnNetwo
 import android.os.Build
 import android.os.HandlerThread
 import android.os.Looper
+import android.util.Log
 import androidx.test.InstrumentationRegistry
 import com.android.net.module.util.ArrayTrackRecord
 import com.android.testutils.CompatUtil
+import com.android.testutils.DevSdkIgnoreRule
+import com.android.testutils.DevSdkIgnoreRule.IgnoreAfter
 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo
 import com.android.testutils.DevSdkIgnoreRunner
 import com.android.testutils.isDevSdkInRange
 import org.junit.After
 import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.mockito.Mockito.doReturn
@@ -41,6 +46,7 @@ import org.mockito.Mockito.verifyNoMoreInteractions
 import java.util.UUID
 import kotlin.test.assertEquals
 import kotlin.test.assertNotEquals
+import kotlin.test.fail
 
 private const val DEFAULT_TIMEOUT_MS = 5000L
 private val instrumentation: Instrumentation
@@ -51,6 +57,8 @@ private val PROVIDER_NAME = "NetworkProviderTest"
 @RunWith(DevSdkIgnoreRunner::class)
 @IgnoreUpTo(Build.VERSION_CODES.Q)
 class NetworkProviderTest {
+    @Rule @JvmField
+    val mIgnoreRule = DevSdkIgnoreRule()
     private val mCm = context.getSystemService(ConnectivityManager::class.java)
     private val mHandlerThread = HandlerThread("${javaClass.simpleName} handler thread")
 
@@ -68,6 +76,7 @@ class NetworkProviderTest {
 
     private class TestNetworkProvider(context: Context, looper: Looper) :
             NetworkProvider(context, looper, PROVIDER_NAME) {
+        private val TAG = this::class.simpleName
         private val seenEvents = ArrayTrackRecord<CallbackEntry>().newReadHead()
 
         sealed class CallbackEntry {
@@ -80,22 +89,30 @@ class NetworkProviderTest {
         }
 
         override fun onNetworkRequested(request: NetworkRequest, score: Int, id: Int) {
+            Log.d(TAG, "onNetworkRequested $request, $score, $id")
             seenEvents.add(OnNetworkRequested(request, score, id))
         }
 
         override fun onNetworkRequestWithdrawn(request: NetworkRequest) {
+            Log.d(TAG, "onNetworkRequestWithdrawn $request")
             seenEvents.add(OnNetworkRequestWithdrawn(request))
         }
 
-        inline fun <reified T : CallbackEntry> expectCallback(
+        inline fun <reified T : CallbackEntry> eventuallyExpectCallbackThat(
             crossinline predicate: (T) -> Boolean
         ) = seenEvents.poll(DEFAULT_TIMEOUT_MS) { it is T && predicate(it) }
+                ?: fail("Did not receive callback after ${DEFAULT_TIMEOUT_MS}ms")
     }
 
     private fun createNetworkProvider(ctx: Context = context): TestNetworkProvider {
         return TestNetworkProvider(ctx, mHandlerThread.looper)
     }
 
+    // In S+ framework, do not run this test, since the provider will no longer receive
+    // onNetworkRequested for every request. Instead, provider needs to
+    // call {@code registerNetworkOffer} with the description of networks they
+    // might have ability to setup, and expects {@link NetworkOfferCallback#onNetworkNeeded}.
+    @IgnoreAfter(Build.VERSION_CODES.R)
     @Test
     fun testOnNetworkRequested() {
         val provider = createNetworkProvider()
@@ -105,13 +122,15 @@ class NetworkProviderTest {
 
         val specifier = CompatUtil.makeTestNetworkSpecifier(
                 UUID.randomUUID().toString())
+        // Test network is not allowed to be trusted.
         val nr: NetworkRequest = NetworkRequest.Builder()
                 .addTransportType(TRANSPORT_TEST)
+                .removeCapability(NET_CAPABILITY_TRUSTED)
                 .setNetworkSpecifier(specifier)
                 .build()
         val cb = ConnectivityManager.NetworkCallback()
         mCm.requestNetwork(nr, cb)
-        provider.expectCallback<OnNetworkRequested>() { callback ->
+        provider.eventuallyExpectCallbackThat<OnNetworkRequested>() { callback ->
             callback.request.getNetworkSpecifier() == specifier &&
             callback.request.hasTransport(TRANSPORT_TEST)
         }
@@ -131,22 +150,24 @@ class NetworkProviderTest {
         val config = NetworkAgentConfig.Builder().build()
         val agent = object : NetworkAgent(context, mHandlerThread.looper, "TestAgent", nc, lp,
                 initialScore, config, provider) {}
+        agent.register()
+        agent.markConnected()
 
-        provider.expectCallback<OnNetworkRequested>() { callback ->
+        provider.eventuallyExpectCallbackThat<OnNetworkRequested>() { callback ->
             callback.request.getNetworkSpecifier() == specifier &&
             callback.score == initialScore &&
             callback.id == agent.providerId
         }
 
         agent.sendNetworkScore(updatedScore)
-        provider.expectCallback<OnNetworkRequested>() { callback ->
+        provider.eventuallyExpectCallbackThat<OnNetworkRequested>() { callback ->
             callback.request.getNetworkSpecifier() == specifier &&
             callback.score == updatedScore &&
             callback.id == agent.providerId
         }
 
         mCm.unregisterNetworkCallback(cb)
-        provider.expectCallback<OnNetworkRequestWithdrawn>() { callback ->
+        provider.eventuallyExpectCallbackThat<OnNetworkRequestWithdrawn>() { callback ->
             callback.request.getNetworkSpecifier() == specifier &&
             callback.request.hasTransport(TRANSPORT_TEST)
         }