private byte[] buffer;

        @BeforeEach
        void setUp() {
            buffer = new byte[BUFFER_SIZE];
        }

        @Test
        @DisplayName("Should create context with constructor parameters")
        void testConstructorWithParameters() {
            int[] hashAlgos = { PreauthIntegrityNegotiateContext.HASH_ALGO_SHA512 };
            byte[] salt = new byte[32];

Let's see a very simple example. It will be so simple that it is not very useful, for now.

But this way we can focus on how the **Dependency Injection** system works.

### Create a dependency, or "dependable" { #create-a-dependency-or-dependable }

Let's first focus on the dependency.

It is just a function that can take all the same parameters that a *path operation function* can take:

    private static final int STRUCTURE_SIZE = 36;

    private int flags;
    private Smb2LeaseKey leaseKey;
    private int leaseState;

    /**
     * Create a lease break acknowledgment
     *
     * @param config configuration
     * @param leaseKey lease key
     * @param leaseState acknowledged lease state
     */

## Install dependencies { #install-dependencies }

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and install `jinja2`:

<div class="termy">

```console
$ pip install jinja2

---> 100%
```

</div>

## Using `Jinja2Templates` { #using-jinja2templates }

* Import `Jinja2Templates`.
* Create a `templates` object that you can reuse later.

      this.gen = gen;
    }

    @Override
    public SampleElements<E> samples() {
      return gen.samples();
    }

    @Override
    public List<E> create(Object... elements) {
      return (List<E>) SerializableTester.reserialize(gen.create(elements));
    }

    @Override
    public E[] createArray(int length) {
      return gen.createArray(length);
    }

    @Override

public class SmbOperationExceptionTest {

    private SmbOperationException exception;

    @BeforeEach
    void setUp() {
        exception = null;
    }

    @Test
    @DisplayName("Should create exception with error code and message")
    void testBasicCreation() {
        // When
        exception = new SmbOperationException(SmbOperationException.ErrorCode.FILE_NOT_FOUND, "test.txt");

        // Then

        });

        // Note: here, type decides is artifact added to "build path" (for example during resolution)
        // and "build path" is intermediate data that is used to create actual Java classpath/modulepath
        // but to create those, proper filtering should happen via Type properties.
    }

    @Override
    public void addHandlers(Map<String, ArtifactHandler> handlers) {

            return null;
        })).status(ApiResult.Status.OK).result());
    }

    // POST /api/admin/group/setting
    /**
     * Creates a new group setting.
     *
     * @param body group setting data to create
     * @return JSON response with created setting ID and status
     */
    @Execute
    public JsonResponse<ApiResult> post$setting(final CreateBody body) {
        validateApi(body, messages -> {});

security = HTTPBasic(auto_error=False)


@app.get("/users/me")
def read_current_user(credentials: Optional[HTTPBasicCredentials] = Security(security)):
    if credentials is None:
        return {"msg": "Create an account first"}
    return {"username": credentials.username, "password": credentials.password}


client = TestClient(app)


def test_security_http_basic():

    /**
     * Create a new SmbOperationException
     *
     * @param errorCode the error code
     * @param message the error message
     */
    public SmbOperationException(ErrorCode errorCode, String message) {
        this(errorCode, message, null, RetryPolicy.DEFAULT, Collections.emptyMap());
    }

    /**
     * Create a new SmbOperationException with cause
     *