To use `TestClient`, first install [`httpx`](https://www.python-httpx.org).

Make sure you create a [virtual environment](../virtual-environments.md), activate it, and then install it, for example:

```console
$ pip install httpx
```

///

Import `TestClient`.

Create a `TestClient` by passing your **FastAPI** application to it.

Create functions with a name that starts with `test_` (this is standard `pytest` conventions).

    private static final String CRYPTO_ERROR_MESSAGE = "Unsupported cryptographic algorithm: AES-256-GCM";
    private static final String ALGORITHM_NAME = "AES-256-GCM";

    @Test
    @DisplayName("Default constructor should create exception with null message and cause")
    void testDefaultConstructor() {
        // Given & When
        CIFSUnsupportedCryptoException exception = new CIFSUnsupportedCryptoException();

        // Then

			testResults = append(testResults, result{dir, entries})
			t.Fatalf("Unable to create a file, %s", err)
		}
		// Symlink will not be added to entries.
		if err := os.Symlink(filepath.Join(dir, name1), filepath.Join(dir, name2)); err != nil {
			t.Fatalf("Unable to create a symlink, %s", err)
		}
		// Add to entries.
		entries = append(entries, name1)

If there were any background tasks (covered in the [Background Tasks](background-tasks.md) section, you will see it later), they will run *after* all the middleware.

///

## Create a middleware { #create-a-middleware }

To create a middleware you use the decorator `@app.middleware("http")` on top of a function.

The middleware function receives:

* The `request`.

    // ===================================================================================
    //                                                                      Create Context
    //                                                                      ==============
    /**
     * Create the access context.
     * @param resource The access context resource.
     * @param userTypeSupplier The supplier of user type.

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.create;

import jcifs.internal.smb2.lease.Smb2LeaseKey;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Lease V1 Create Context Request
 *
 * MS-SMB2 2.2.13.2.8
 */
public class LeaseV1CreateContextRequest implements CreateContextRequest {

    /**

 */
public interface RestTestTransformGlobalSetup {

    /**
     * @param setupNodeParent The parent of an existing "setup" ObjectNode, null otherwise. If null implementations may create choose to
     *                        create the section.
     */
    ObjectNode transformSetup(@Nullable ObjectNode setupNodeParent);

  public void testOrderingDoesntAffectEqualsComparisons() {
    SetMultimap<K, V> multimap1 =
        getSubjectGenerator()
            .create(mapEntry(k0(), v0()), mapEntry(k0(), v1()), mapEntry(k0(), v4()));
    SetMultimap<K, V> multimap2 =
        getSubjectGenerator()
            .create(mapEntry(k0(), v1()), mapEntry(k0(), v0()), mapEntry(k0(), v4()));
    new EqualsTester().addEqualityGroup(multimap1, multimap2).testEquals();
  }

  public void testOrderingDoesntAffectEqualsComparisons() {
    SetMultimap<K, V> multimap1 =
        getSubjectGenerator()
            .create(mapEntry(k0(), v0()), mapEntry(k0(), v1()), mapEntry(k0(), v4()));
    SetMultimap<K, V> multimap2 =
        getSubjectGenerator()
            .create(mapEntry(k0(), v1()), mapEntry(k0(), v0()), mapEntry(k0(), v4()));
    new EqualsTester().addEqualityGroup(multimap1, multimap2).testEquals();
  }

        @Test
        @DisplayName("should create .mvn directory when model version is not 4.1.0")
        void shouldCreateMvnDirectoryWhenModelVersionNot410() throws Exception {
            Path projectDir = tempDir.resolve("project");
            Files.createDirectories(projectDir);

            // Create a simple POM file
            String pomXml = PomBuilder.create()
                    .groupId("test")