[RFPM02] Add Dependencies class for injection in tests.

Add Dependencies class in PermissionMonitor for injection
in tests easily.

Bug: 132784544
Test: atests FrameworksNetTests
Change-Id: Ibb84d548908f7a955fa0ff206794486733259978

services/core/java/com/android/server/connectivity/PermissionMonitor.java

@@ -82,6 +82,7 @@ public class PermissionMonitor implements PackageManagerInternal.PackageListObse
     private final PackageManager mPackageManager;
     private final UserManager mUserManager;
     private final INetd mNetd;
+    private final Dependencies mDeps;
 
     // Values are User IDs.
     @GuardedBy("this")
@@ -102,10 +103,30 @@ public class PermissionMonitor implements PackageManagerInternal.PackageListObse
     @GuardedBy("this")
     private final Set<Integer> mAllApps = new HashSet<>();
 
-    public PermissionMonitor(Context context, INetd netd) {
+    /**
+     * Dependencies of PermissionMonitor, for injection in tests.
+     */
+    @VisibleForTesting
+    public static class Dependencies {
+        /**
+         * Get device first sdk version.
+         */
+        public int getDeviceFirstSdkInt() {
+            return Build.VERSION.FIRST_SDK_INT;
+        }
+    }
+
+    public PermissionMonitor(@NonNull final Context context, @NonNull final INetd netd) {
+        this(context, netd, new Dependencies());
+    }
+
+    @VisibleForTesting
+    PermissionMonitor(@NonNull final Context context, @NonNull final INetd netd,
+            @NonNull final Dependencies deps) {
         mPackageManager = context.getPackageManager();
         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
         mNetd = netd;
+        mDeps = deps;
     }
 
     // Intended to be called only once at startup, after the system is ready. Installs a broadcast
@@ -185,11 +206,6 @@ public class PermissionMonitor implements PackageManagerInternal.PackageListObse
         return appInfo.isVendor() || appInfo.isOem() || appInfo.isProduct();
     }
 
-    @VisibleForTesting
-    protected int getDeviceFirstSdkInt() {
-        return Build.VERSION.FIRST_SDK_INT;
-    }
-
     @VisibleForTesting
     boolean hasPermission(@NonNull final PackageInfo app, @NonNull final String permission) {
         if (app.requestedPermissions == null || app.requestedPermissionsFlags == null) {
@@ -212,7 +228,7 @@ public class PermissionMonitor implements PackageManagerInternal.PackageListObse
         if (app.applicationInfo != null) {
             // Backward compatibility for b/114245686, on devices that launched before Q daemons
             // and apps running as the system UID are exempted from this check.
-            if (app.applicationInfo.uid == SYSTEM_UID && getDeviceFirstSdkInt() < VERSION_Q) {
+            if (app.applicationInfo.uid == SYSTEM_UID && mDeps.getDeviceFirstSdkInt() < VERSION_Q) {
                 return true;
             }
 

tests/net/java/com/android/server/connectivity/PermissionMonitorTest.java

@@ -114,6 +114,7 @@ public class PermissionMonitorTest {
     @Mock private INetd mNetdService;
     @Mock private PackageManagerInternal mMockPmi;
     @Mock private UserManager mUserManager;
+    @Mock private PermissionMonitor.Dependencies mDeps;
 
     private PermissionMonitor mPermissionMonitor;
 
@@ -128,7 +129,7 @@ public class PermissionMonitorTest {
                         new UserInfo(MOCK_USER2, "", 0),
                 }));
 
-        mPermissionMonitor = spy(new PermissionMonitor(mContext, mNetdService));
+        mPermissionMonitor = spy(new PermissionMonitor(mContext, mNetdService, mDeps));
 
         LocalServices.removeServiceForTest(PackageManagerInternal.class);
         LocalServices.addService(PackageManagerInternal.class, mMockPmi);
@@ -283,14 +284,14 @@ public class PermissionMonitorTest {
 
     @Test
     public void testHasRestrictedNetworkPermissionSystemUid() {
-        doReturn(VERSION_P).when(mPermissionMonitor).getDeviceFirstSdkInt();
+        doReturn(VERSION_P).when(mDeps).getDeviceFirstSdkInt();
         assertTrue(hasRestrictedNetworkPermission(PARTITION_SYSTEM, VERSION_P, SYSTEM_UID));
         assertTrue(hasRestrictedNetworkPermission(
                 PARTITION_SYSTEM, VERSION_P, SYSTEM_UID, CONNECTIVITY_INTERNAL));
         assertTrue(hasRestrictedNetworkPermission(
                 PARTITION_SYSTEM, VERSION_P, SYSTEM_UID, CONNECTIVITY_USE_RESTRICTED_NETWORKS));
 
-        doReturn(VERSION_Q).when(mPermissionMonitor).getDeviceFirstSdkInt();
+        doReturn(VERSION_Q).when(mDeps).getDeviceFirstSdkInt();
         assertFalse(hasRestrictedNetworkPermission(PARTITION_SYSTEM, VERSION_Q, SYSTEM_UID));
         assertFalse(hasRestrictedNetworkPermission(
                 PARTITION_SYSTEM, VERSION_Q, SYSTEM_UID, CONNECTIVITY_INTERNAL));