Fix build failure

components/mobile-plugins/android-plugin/io.entgra.device.mgt.plugins.mobile.android.api/src/test/java/io/entgra/device/mgt/plugins/mobile/android/api/mocks/DeviceManagementProviderServiceMock.java

@@ -899,4 +899,14 @@ public class DeviceManagementProviderServiceMock implements DeviceManagementProv
     public List<Application> getInstalledApplicationsOnDevice(Device device) throws DeviceManagementException {
         return null;
     }
+
+    @Override
+    public List<Device> getEnrolledDevicesSince(Date date) throws DeviceManagementException {
+        return null;
+    }
+
+    @Override
+    public List<Device> getEnrolledDevicesPriorTo(Date date) throws DeviceManagementException {
+        return null;
+    }
 }