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 }

    ByteSource source = out.asByteSource();

    out.write(data);
    assertThat(source.read()).isEqualTo(data);

    out.close();
    assertThrows(IOException.class, () -> out.write(42));

    // Verify that write had no effect
    assertThat(source.read()).isEqualTo(data);
    out.reset();
  }

  public void testReset() throws Exception {
    byte[] data = newPreFilledByteArray(100);

    }

    @Test
    void testSetLength() throws SmbException {
        long newLength = 2048L;
        smbRandomAccessFile.setLength(newLength);
        // Verify length was set (actual behavior depends on implementation)
    }

    @Test
    void testSkipBytes() throws SmbException {
        int skipAmount = 100;

			}
			// Compare the full checksum structs
			if !chksm.Equal(gotChksm) {
				t.Errorf("Checksum mismatch for %s: expected %+v, got %+v", tt.name, chksm, gotChksm)
			}
			// Verify the checksum type
			expectedType := chksm.Type
			if gotChksm.Type != expectedType {
				t.Errorf("Type mismatch for %s: expected %s, got %s", tt.name, expectedType.StringFull(), gotChksm.Type.StringFull())
			}
		})

        assertFalse(exception.aborted());
    }

    @Test
    public void test_constructorWithThrowableCause_BackwardCompatibilityWithException() {
        // Verify backward compatibility - Exception types still work
        String url = "http://example.com/test";
        String message = "Crawling error";

        // Test with IOException

         * SMB_COM_SESSION_SETUP_ANDX Request (section 2.2.4.53.1).
         */
        if (this.digest != null && getErrorCode() == 0) {
            final boolean verify = this.digest.verify(buffer, i, size, 0, this);
            this.verifyFailed = verify;
            return !verify;
        }
        return true;
    }

    /**
     * Writes a string to the destination buffer using the current encoding.
     *

		// the file header and TOC. (0x7e -> 0x7f)
		b[0x11]++
		b[0x9d]++

		// TODO(bradfitz): add a new test that only corrupts
		// one of these values, and verify that that's also an
		// error. Currently, the reader code doesn't verify the
		// fileheader and TOC's crc32 match if they're both
		// non-zero and only the second line above, the TOC,
		// is what matters.
	})
}

        // Default should be UTF-8 or similar
    }

    @Test
    public void test_fessConfig_ignoreEmptyContent() {
        final FessConfig config = ComponentUtil.getFessConfig();
        // Verify the config returns the expected default value (false)
        assertFalse(config.isCrawlerDocumentFileIgnoreEmptyContent());
    }

    @Test
    public void test_responseData_defaultValues() {

        when(addr.getHostName()).thenReturn("mycomputer.foo.com");
        UniAddress ua = new UniAddress(addr);
        // Act: first call should set to SMBSERVER_NAME
        String initial = ua.firstCalledName();
        // verify that subsequent call gives SMBSERVER_NAME
        String next = ua.nextCalledName();
        // Assert
        assertEquals(NbtAddress.SMBSERVER_NAME, next, "nextCalledName should return SMBSERVER_NAME after first call");

        Map<String, Object> properties = new HashMap<>();
        properties.put(Constants.MAVEN_DEPLOY_BUILD_POM, "false");

        assertFalse(Features.deployBuildPom(properties));

        // Verify the map wasn't modified
        assertEquals(1, properties.size());
        assertEquals("false", properties.get(Constants.MAVEN_DEPLOY_BUILD_POM));
    }

    @Test