Add test for NetworkCapabilities.Builder.withoutDefaultCapabilities

Bug: 186061922
Test: atest CtsNetTestCases:android.net.NetworkCapabilitiesTest
Merged-In: I369e71dd6ae85da78e114ea8377967ab0bde787b
Change-Id: I369e71dd6ae85da78e114ea8377967ab0bde787b
(cherry picked from commit 0aa0790d)

tests/common/java/android/net/NetworkCapabilitiesTest.java

@@ -33,6 +33,7 @@ import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_OEM_PAID;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_OEM_PRIVATE;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_PARTIAL_CONNECTIVITY;
+import static android.net.NetworkCapabilities.NET_CAPABILITY_TRUSTED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_WIFI_P2P;
 import static android.net.NetworkCapabilities.REDACT_FOR_ACCESS_FINE_LOCATION;
@@ -1155,4 +1156,15 @@ public class NetworkCapabilitiesTest {
             assertEquals(Set.of(TEST_SUBID1), nc2.getSubscriptionIds());
         }
     }
+
+    @Test @IgnoreUpTo(Build.VERSION_CODES.R)
+    public void testBuilderWithoutDefaultCap() {
+        final NetworkCapabilities nc =
+                NetworkCapabilities.Builder.withoutDefaultCapabilities().build();
+        assertFalse(nc.hasCapability(NET_CAPABILITY_NOT_RESTRICTED));
+        assertFalse(nc.hasCapability(NET_CAPABILITY_TRUSTED));
+        assertFalse(nc.hasCapability(NET_CAPABILITY_NOT_VPN));
+        // Ensure test case fails if new net cap is added into default cap but no update here.
+        assertEquals(0, nc.getCapabilities().length);
+    }
 }