Simplify feature enabled checking in IpReachabilityMonitorTest.

Test: test-only change
Change-Id: I15d3b6af990a5c0a1d019d7f380f8058698b8165
diff --git a/tests/integration/signature/android/net/ip/IpClientSignatureTest.kt b/tests/integration/signature/android/net/ip/IpClientSignatureTest.kt
index e725ea9..427b83a 100644
--- a/tests/integration/signature/android/net/ip/IpClientSignatureTest.kt
+++ b/tests/integration/signature/android/net/ip/IpClientSignatureTest.kt
@@ -92,3 +92,4 @@
         return DEFAULT_NUD_SOLICIT_NUM_POST_ROAM
     }
 }
+
diff --git a/tests/unit/src/android/net/ip/IpReachabilityMonitorTest.kt b/tests/unit/src/android/net/ip/IpReachabilityMonitorTest.kt
index 9971e4b..e071280 100644
--- a/tests/unit/src/android/net/ip/IpReachabilityMonitorTest.kt
+++ b/tests/unit/src/android/net/ip/IpReachabilityMonitorTest.kt
@@ -55,8 +55,6 @@
 import com.android.net.module.util.netlink.StructNdMsg.NUD_REACHABLE
 import com.android.net.module.util.netlink.StructNdMsg.NUD_STALE
 import com.android.networkstack.metrics.IpReachabilityMonitorMetrics
-import com.android.networkstack.util.NetworkStackUtils.IP_REACHABILITY_IGNORE_INCOMPLETE_IPV6_DEFAULT_ROUTER_VERSION
-import com.android.networkstack.util.NetworkStackUtils.IP_REACHABILITY_IGNORE_INCOMPLETE_IPV6_DNS_SERVER_VERSION
 import com.android.networkstack.util.NetworkStackUtils.IP_REACHABILITY_MCAST_RESOLICIT_VERSION
 import com.android.networkstack.util.NetworkStackUtils.IP_REACHABILITY_ROUTER_MAC_CHANGE_FAILURE_ONLY_AFTER_ROAM_VERSION
 import com.android.testutils.makeNewNeighMessage
@@ -268,11 +266,8 @@
                 eq(IP_REACHABILITY_MCAST_RESOLICIT_VERSION))
 
         // TODO: test with non-default flag combinations.
-        doReturn(false).`when`(dependencies).isFeatureEnabled(any(), anyString())
-        doReturn(false).`when`(dependencies).isFeatureNotChickenedOut(any(),
-            eq(IP_REACHABILITY_IGNORE_INCOMPLETE_IPV6_DNS_SERVER_VERSION))
-        doReturn(false).`when`(dependencies).isFeatureNotChickenedOut(any(),
-            eq(IP_REACHABILITY_IGNORE_INCOMPLETE_IPV6_DEFAULT_ROUTER_VERSION))
+        // Note: because dependencies is a mock, all features that are not specified here are
+        // neither enabled nor chickened out.
         doReturn(true).`when`(dependencies).isFeatureNotChickenedOut(any(),
             eq(IP_REACHABILITY_ROUTER_MAC_CHANGE_FAILURE_ONLY_AFTER_ROAM_VERSION))