# Classes as Dependencies { #classes-as-dependencies }

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

fi
set -x

# "TFCI_MACOS_PYENV_INSTALL_ENABLE" controls whether to use Pyenv to install
# the Python version set in "TFCI_PYTHON_VERSION" and use it as default.
# We enable this in the nightly and release builds because before uploading the
# wheels, we install them in a virtual environment and run some smoke tests on
# it. TFCI Mac VMs only have one Python version installed so we need to install
# the other versions manually.

import org.codelibs.fess.suggest.settings.AnalyzerSettings;
import org.codelibs.fess.suggest.settings.SuggestSettings;
import org.codelibs.opensearch.runner.OpenSearchRunner;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.transport.client.Client;

public class SuggestUtilTest {

    void setUp() throws Exception {
        // Backup system properties to restore them after each test
        originalSystemProperties = (Properties) System.getProperties().clone();
        // Reset static state of the Handler class before each test for isolation
        resetHandlerState();
        handler = new Handler(mockCifsContext);
    }

    @AfterEach
    void tearDown() throws Exception {

 */
class Exchange(
  internal val call: RealCall,
  internal val finder: ExchangeFinder,
  private val codec: ExchangeCodec,
) {
  /** True if the request body need not complete before the response body starts. */
  internal var isDuplex: Boolean = false
    private set

  /** True if there was an exception on the connection to the peer. */
  internal var hasFailure: Boolean = false
    private set

 *  Fix: Allow a body in `OPTIONS` requests.
 *  Fix: Don't percent-encode non-ASCII characters in URL fragments.
 *  Fix: Handle null fragments.
 *  Fix: Don’t crash on interceptors that throw `IOException` before a
    connection is attempted.
 *  New: Support [WebDAV][webdav] HTTP methods.
 *  New: Buffer WebSocket frames for better performance.
 *  New: Drop support for `TLS_DHE_DSS_WITH_AES_128_CBC_SHA`, our only remaining

    protected final DocList docList = new DocList();

    /** Maximum size of document requests in bytes */
    protected long maxDocumentRequestSize;

    /** Maximum number of documents to cache before indexing */
    protected int maxDocumentCacheSize;

    /** Factory for creating ingesters to process documents */
    private IngestFactory ingestFactory = null;

    /**

     *
     * @param data encoded data
     * @param offset offset in data
     * @return parsed NetworkInterfaceInfo
     */
    public static NetworkInterfaceInfo decode(byte[] data, int offset) {
        // Ensure we have enough data for the full structure
        if (data.length < offset + Smb2ChannelCapabilities.NETWORK_INTERFACE_INFO_SIZE) {
            return null;
        }

	}

	f, err := parser.ParseFile(fset, filename, nil, parser.ParseComments)
	if err != nil {
		return nil, err
	}
	parsedFileCache[filename] = f

	return f, nil
}

// Disable before debugging non-obvious errors from the type-checker.
const usePkgCache = true

var (
	pkgCache = map[string]*apiPackage{} // map tagKey to package

    computationComplete.await();

    // At this point, the listener should be holding the seed value (a -> a), and the map should
    // contain the computed value (b -> b), since the clear() happened before the computation
    // completed.
    assertThat(listener).hasSize(1);
    RemovalNotification<String, String> notification = listener.remove();
    assertThat(notification.getKey()).isEqualTo("a");