Being able to use asynchronous functions in your tests could be useful, for example, when you're querying your database asynchronously. Imagine you want to test sending requests to your FastAPI application and then verify that your backend successfully wrote the correct data in the database, while using an async database library.

Let's look at how we can make that work.

## pytest.mark.anyio { #pytest-mark-anyio }

        byte[] decrypted = KerberosEncData.decrypt(data, key, KerberosConstants.DES_ENC_TYPE);
        assertNotNull(decrypted);
        // With dummy data, we can't verify the content, just that it decrypts without error
        // and returns a result of the expected size.
        assertEquals(data.length - 24, decrypted.length);
    }

    /**

        // Test setting a custom instance
        LogStream.setInstance(testStream);
        LogStream instance = LogStream.getInstance();
        assertNotNull(instance);

        // Write something to verify it uses our test stream
        instance.println("test message");
        instance.flush();
        String output = testOutput.toString();
        assertTrue(output.contains("test message"));
    }

    @Test

 * without changing its state, so the tester needs a steady supply of fresh Iterators.
 *
 * <p>If your iterator supports modification through {@code remove()}, you may wish to override the
 * verify() method, which is called after each sequence and is guaranteed to be called
 * using the latest values obtained from {@link IteratorTester#newTargetIterator()}.
 *

        URL url2 = new URL(null, "smb://host:1234/share/file.txt", handler);
        URL url3 = new URL(null, "smb://user:pass@host/share", handler);

        // Assert - Verify URL components
        assertEquals("smb", url1.getProtocol());
        assertEquals("host", url1.getHost());
        assertEquals(445, url1.getPort());
        assertEquals("/share", url1.getPath());

import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.stream.Stream;

import org.junit.jupiter.api.BeforeEach;

        mockRequest.setMethod("POST");
        mockRequest.setRequestURI("/test/uri");

        webApiRequest = new WebApiRequest(mockRequest, customPath);

        // Verify that other methods are properly delegated
        assertEquals("POST", webApiRequest.getMethod());
        assertEquals("/test/uri", webApiRequest.getRequestURI());

* The API checks that `username` and `password`, and responds with a "token" (we haven't implemented any of this yet).
    * A "token" is just a string with some content that we can use later to verify this user.
    * Normally, a token is set to expire after some time.
        * So, the user will have to log in again at some point later.

    @Test
    @DisplayName("Test configuration updates")
    void testConfigurationUpdates() {
        resourceManager.configure(5000, 1000, false, false);

        // Configuration should be applied (we can't directly verify private fields,
        // but we can ensure it doesn't throw)
        assertDoesNotThrow(() -> resourceManager.checkForLeaks());
        assertDoesNotThrow(() -> resourceManager.performCleanup());
    }

        // Assert
        assertNotNull(result);
        assertTrue(result.contains("pipeName=" + specialPipeName));
    }

    @Test
    @DisplayName("Verify parent class command types")
    void testParentClassCommandTypes() {
        // Arrange
        transWaitNamedPipe = new TransWaitNamedPipe(mockConfig, testPipeName);

        // Assert