# 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] *}

		return
	}
	select {
	case <-GlobalContext.Done():
	case wrkr <- je:
	default:
		es.stats.missedTierJournalTasks.Add(1)
	}
}

// enqueueFreeVersion enqueues a free version to be deleted
func (es *expiryState) enqueueFreeVersion(oi ObjectInfo) {
	task := freeVersionTask{ObjectInfo: oi}
	wrkr := es.getWorkerCh(task.OpHash())
	if wrkr == nil {
		es.stats.missedFreeVersTasks.Add(1)
		return
	}

### Garbage Collector

    private SmbTree smbTree;

    @Mock
    private SmbTree mockWrappedTree;

    /**
     * Setup method executed before each test.
     */
    @BeforeEach
    void setUp() {
        // Common setup if needed
    }

    /**
     * Test for unwrap() method with matching type.
     * Verifies that unwrap returns the correct instance when the type matches.
     */
    @Test
    void testUnwrap_withMatchingType() {

            userBhv.delete(user, op -> {
                op.setRefreshPolicy(Constants.TRUE);
            });

            if (logger.isInfoEnabled()) {
                logger.info("User deleted successfully: username={}, id={}", username, userId);
            }
        } catch (final Exception e) {
            logger.warn("Failed to delete user: username={}, id={}, error={}", username, userId, e.getMessage(), e);

        }
        return url.toString();
    }

    /**
     * Builds a URL from protocol, hostname string, port, and path.
     * Properly handles IPv6 addresses by wrapping them in brackets if needed.
     *
     * @param protocol the protocol (e.g., "http", "https")
     * @param host the hostname or IP address string
     * @param port the port number
     * @param path the path (should start with "/" or be empty)

                            }
                        }
                    }
                } else {
                    // Forbidden
                    logger.warn("Access denied to file: file={}", file.getAbsolutePath());
                    responseData.setHttpStatusCode(Constants.FORBIDDEN_STATUS_CODE);
                    responseData.setMimeType(APPLICATION_OCTET_STREAM);
                }

        } finally {
            tempFile.delete();
        }
    }

    public void test_responseBodyFileTemporary() throws IOException {
        // Test response body with temporary file that gets deleted on close
        ResponseData data = new ResponseData();

        File tempFile = File.createTempFile("test_temp", ".txt");
        String content = "Temporary file content";

        @Test
        @DisplayName("Should handle response at end of buffer")
        void testResponseAtEndOfBuffer() throws SMBProtocolDecodingException {
            byte[] buffer = new byte[20]; // Exact size needed
            SMBUtil.writeInt2(17, buffer, 0);
            SMBUtil.writeInt2(0, buffer, 2);
            SMBUtil.writeInt4(999, buffer, 4);
            SMBUtil.writeInt4(111, buffer, 8);

            when(mockCtx.supportsIntegrity()).thenReturn(true);
            when(mockCtx.calculateMIC(any(byte[].class))).thenReturn(new byte[] { 42 });
            // verifyMIC returns void; no stubbing needed
            when(mockCtx.isMICAvailable()).thenReturn(true);

            // Act
            useContext(mockCtx);

            // Assert: verify key interactions and ordering where meaningful