The `TestClient` is based on [HTTPX](https://www.python-httpx.org), and luckily, we can use it directly to test the API.

## Example { #example }

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md) and [Testing](../tutorial/testing.md):

```
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

# Access: http://localhost:8080/ (Admin: admin/admin)
```

### Code Formatting
```bash
mvn formatter:format    # Format code
mvn license:format      # Add license headers
```

## Directory Structure

```
src/main/java/org/codelibs/fess/
├── FessBoot.java              # Application entry point
├── Constants.java             # Central application constants
├── app/

```console
$ <font color="#4E9A06">fastapi</font> dev

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀

             Searching for package file structure from directories with
             <font color="#3465A4">__init__.py</font> files
             Importing from <font color="#75507B">/home/user/code/</font><font color="#AD7FA8">awesomeapp</font>

        assertTrue(exception instanceof java.io.Serializable);
    }

    @Test
    public void test_getMessage_withComplexCause() {
        // Test getMessage behavior with complex cause structure
        final Exception innerCause = new NullPointerException("NPE occurred");
        final Exception outerCause = new IllegalStateException("State error", innerCause);

        assertEquals(-1, ((QueryRescorerBuilder) result).windowSize().intValue());
    }

    @Test
    public void test_evaluate_withComplexParams() {
        // Test with complex parameter map including nested structures
        final String testModelName = "complex_model";
        final int testWindowSize = 200;

        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            @Override

        assertTrue(bytesWritten > 0);

        // Verify structure size field
        assertEquals(57, buffer[0]);
        assertEquals(0, buffer[1]);
    }

    @Test
    @DisplayName("Test writeBytesWireFormat with long path")
    void testWriteBytesWireFormatLongPath() {
        String longPath = "very\\long\\path\\to\\some\\deeply\\nested\\file\\in\\directory\\structure.txt";

    }

    @Test
    @DisplayName("Arrays: non-null, same length, and exact contents")
    void arrays_are_well_formed_and_match() {
        // Validate arrays existence and alignment (edge and structure checks)
        assertNotNull(WinError.WINERR_CODES, "WINERR_CODES should not be null");
        assertNotNull(WinError.WINERR_MESSAGES, "WINERR_MESSAGES should not be null");

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files
             Importing from <font color="#75507B">/home/user/code/</font><font color="#AD7FA8">awesomeapp</font>

- **Configuration**: Allows the build structure and work, such as tasks, to be specified. This includes the project model, the DSL and so on.
- **Execution**: Runs the work efficiently. This includes scheduling, execution, caching and so on.

#### Software development platform

/**
 * A non-blocking queue which automatically evicts elements from the head of the queue when
 * attempting to add new elements onto the queue and it is full. This queue orders elements FIFO
 * (first-in-first-out). This data structure is logically equivalent to a circular buffer (i.e.,
 * cyclic buffer or ring buffer).
 *
 * <p>An evicting queue must be configured with a maximum size. Each time an element is added to a