Add a test to identify memory leak in ConnectivityManager
The sInstance static instance which self reference to
ConnectivityManager which holds a reference to a ConnectivityManager
instance causes the Context referenced by that instance to never be
GCed.
Bug: 202978965
Test: atest ConnectivityManagerTest
Change-Id: I0227f63dbc27688ea5f4ef9275fd0f9c247ad14c
diff --git a/tests/unit/java/android/net/ConnectivityManagerTest.java b/tests/unit/java/android/net/ConnectivityManagerTest.java
index f324630..f64ae58 100644
--- a/tests/unit/java/android/net/ConnectivityManagerTest.java
+++ b/tests/unit/java/android/net/ConnectivityManagerTest.java
@@ -72,6 +72,7 @@
import androidx.test.filters.SmallTest;
+import com.android.internal.util.test.BroadcastInterceptingContext;
import com.android.testutils.DevSdkIgnoreRule;
import com.android.testutils.DevSdkIgnoreRunner;
@@ -82,6 +83,8 @@
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
+import java.lang.ref.WeakReference;
+
@RunWith(DevSdkIgnoreRunner.class)
@SmallTest
@DevSdkIgnoreRule.IgnoreUpTo(VERSION_CODES.R)
@@ -461,4 +464,50 @@
}
fail("expected exception of type " + throwableType);
}
+
+ private static class MockContext extends BroadcastInterceptingContext {
+ MockContext(Context base) {
+ super(base);
+ }
+
+ @Override
+ public Context getApplicationContext() {
+ return mock(Context.class);
+ }
+ }
+
+ private WeakReference<Context> makeConnectivityManagerAndReturnContext() {
+ // Mockito may have an internal reference to the mock, creating MockContext for testing.
+ final Context c = new MockContext(mock(Context.class));
+
+ new ConnectivityManager(c, mService);
+
+ return new WeakReference<>(c);
+ }
+
+ private void forceGC() {
+ // First GC ensures that objects are collected for finalization, then second GC ensures
+ // they're garbage-collected after being finalized.
+ System.gc();
+ System.runFinalization();
+ System.gc();
+ }
+
+ @Test
+ public void testConnectivityManagerDoesNotLeakContext() throws Exception {
+ final WeakReference<Context> ref = makeConnectivityManagerAndReturnContext();
+
+ final int attempts = 100;
+ final long waitIntervalMs = 50;
+ for (int i = 0; i < attempts; i++) {
+ forceGC();
+ if (ref.get() == null) break;
+
+ Thread.sleep(waitIntervalMs);
+ }
+
+ // TODO: fix memory leak then assertNull here.
+ assertNotNull("Couldn't find the Context leak in ConnectivityManager after " + attempts
+ + " attempts", ref.get());
+ }
}