totalSize int64
		partSize  int64
		partIndex int
		err       error
	}{
		// partSize is 0, returns error.
		{10, 0, 1, errPartSizeZero},
		// partIndex is 0, returns error.
		{10, 1, 0, errPartSizeIndex},
		// Total size is -1, returns error.
		{-2, 10, 1, errInvalidArgument},
	}

	for i, testCaseFailure := range testCasesFailure {

Now, let's include the `router`s from the submodules `users` and `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info

`users.router` contains the `APIRouter` inside of the file `app/routers/users.py`.

And `items.router` contains the `APIRouter` inside of the file `app/routers/items.py`.

	// also has expected response data.
	testCases := []struct {
		byteRange      string
		expectedString string
	}{
		// request for byte range 10-11.
		// expecting the result to contain only putContent[10:12] bytes.
		{"10-11", putContent[10:12]},
		// request for object data after the first byte.
		{"1-", putContent[1:]},
		// request for object data after the first byte.
		{"6-", putContent[6:]},

        this.channelCounter = new AtomicInteger(0);
        this.multiChannelEnabled = false;

        // Schedule periodic health checks
        scheduler.scheduleAtFixedRate(this::performHealthCheck, 10, 10, TimeUnit.SECONDS);

        // Schedule interface discovery
        scheduler.scheduleAtFixedRate(this::discoverInterfaces, 0, 30, TimeUnit.SECONDS);
    }

    /**
     * Initialize multi-channel support

  "durations" : [ {
    "testProject" : "largeGroovyMultiProject",
    "linux" : 740
  }, {
    "testProject" : "largeJavaMultiProject",
    "linux" : 566,
    "windows" : 1006,
    "macOs" : 281
  }, {
    "testProject" : "largeMonolithicGroovyProject",
    "linux" : 2320
  }, {
    "testProject" : "largeMonolithicJavaProject",
    "linux" : 1577
  } ]
}, {

            DfsReferralDataInternal combined = first.combine(second);

            assertNotNull(combined);
            assertEquals(10 + 15, combined.getPathConsumed());
        }
    }

    @Nested
    @DisplayName("ToString Tests")
    class ToStringTests {

        @Test

Ahora, incluyamos los `router`s de los submódulos `users` y `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info | Información

`users.router` contiene el `APIRouter` dentro del archivo `app/routers/users.py`.

Y `items.router` contiene el `APIRouter` dentro del archivo `app/routers/items.py`.

Agora, vamos incluir os `router`s dos submódulos `users` e `items`:

{* ../../docs_src/bigger_applications/app_an_py39/main.py hl[10:11] title["app/main.py"] *}

/// info | Informação

`users.router` contém o `APIRouter` dentro do arquivo `app/routers/users.py`.

E `items.router` contém o `APIRouter` dentro do arquivo `app/routers/items.py`.

				"video/vc1",
				"video/vnd.cctv",
				"video/vnd.dlna.mpeg-tts",
				"video/vnd.fvt",
				"video/vnd.hns.video",
				"video/vnd.iptvforum.1dparityfec-1010",
				"video/vnd.iptvforum.1dparityfec-2005",
				"video/vnd.iptvforum.2dparityfec-1010",
				"video/vnd.iptvforum.2dparityfec-2005",
				"video/vnd.iptvforum.ttsavc",
				"video/vnd.iptvforum.ttsmpeg2",
				"video/vnd.motorola.video",

	}
	err = r.skip(5)
	if err != nil {
		t.Fatal(err)
	}
	names, err = r.readNames(5)
	if err != nil {
		t.Fatal(err)
	}
	want = loadMetacacheSampleNames[10:15]
	if !reflect.DeepEqual(names, want) {
		t.Errorf("got unexpected result: %#v", names)
	}

	err = r.skip(len(loadMetacacheSampleNames))
	if err != io.EOF {
		t.Fatal(err)
	}