replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

# Generating SDKs { #generating-sdks }

Because **FastAPI** is based on the **OpenAPI** specification, its APIs can be described in a standard format that many tools understand.

This makes it easy to generate up-to-date **documentation**, client libraries (<abbr title="Software Development Kits">**SDKs**</abbr>) in multiple languages, and **testing** or **automation workflows** that stay in sync with your code.

    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> getRootCause(cause));
    assertThat(expected).hasCauseThat().isSameInstanceAs(cause);
  }

  @J2ktIncompatible // Format does not match
  @GwtIncompatible // getStackTraceAsString(Throwable)
  public void testGetStackTraceAsString() {
    class StackTraceException extends Exception {
      StackTraceException(String message) {

        // Verify type is displayed as hex
        assertNotNull(str);
        assertTrue(str.contains("type=0x"));
        // The type should be formatted as 8-character hex
        String expectedHex = String.format("%08x", type);
        assertTrue(str.toLowerCase().contains(expectedHex));
    }

    @Test
    @DisplayName("Test with empty strings")
    void testWithEmptyStrings() {

{* ../../docs_src/path_operation_advanced_configuration/tutorial006.py hl[19:36, 39:40] *}

In this example, we didn't declare any Pydantic model. In fact, the request body is not even <abbr title="converted from some plain format, like bytes, into Python objects">parsed</abbr> as JSON, it is read directly as `bytes`, and the function `magic_data_reader()` would be in charge of parsing it in some way.

        String filePath = directoryPath;
        if (!filePath.endsWith("/")) {
            filePath += "/";
        }
        filePath += fileInfo.getName();

        // Ensure proper SMB URL format
        if (!filePath.startsWith("smb://")) {
            if (filePath.startsWith("/")) {
                filePath = "smb://localhost" + filePath;
            } else {

        assertTrue(result.contains("action="));
        assertTrue(result.contains("file=" + fileName));
        // Hexdump.toHexString produces 4-character padded uppercase hex
        String expectedHex = String.format("%04X", action);
        assertTrue(result.contains("0x" + expectedHex));
    }

    @Test
    @DisplayName("Test toString with empty object")
    void testToStringEmpty() {

            int result = (int) method.invoke(cancel, buffer, bufferIndex);

            // Then
            assertEquals(0, result);
        }
    }

    @Nested
    @DisplayName("Wire Format Tests")
    class WireFormatTests {

        private SmbComNtCancel cancel;
        private Configuration mockConfig;

        @BeforeEach
        void setUp() throws Exception {

        SecurityBlob blob = new SecurityBlob(input);

        // Act
        String actual = blob.toString();

        // Assert
        assertEquals(expected, actual, "Hex string should match expected format");
    }

    // Ensures a default-constructed blob starts empty and stable across APIs
    @Test
    @DisplayName("Default constructor yields empty state")
    void defaultConstructor_initialState() {