@Test
 public void testGetSkinFile_FileFound() throws Exception {
   subAppResourcesNetworkServicePluginRoot.start();
   catchException(subAppResourcesNetworkServicePluginRoot)
       .getSkinFile(skinId.randomUUID(), "walletPublicKey");
   assertThat(caughtException()).isNull();
 }
 @Test
 public void testGetSkinFile_FileNotFound() throws Exception {
   subAppResourcesNetworkServicePluginRoot.start();
   catchException(subAppResourcesNetworkServicePluginRoot).getSkinFile(null, null);
   assertThat(caughtException()).isNotNull();
 }