public void tearDown() {
        if (rateLimiter != null) {
            rateLimiter.close();
        }
    }

    @Test
    public void testNormalAuthentication() throws Exception {
        // Normal authentication should be allowed
        assertTrue(rateLimiter.checkAttempt("user1", "192.168.1.1"), "First attempt should be allowed");

        // Record success
        rateLimiter.recordSuccess("user1", "192.168.1.1");

你的 API 的使用者（外部開發者）會透過一個 POST 請求在你的 API 中建立一張發票。

然後你的 API 會（讓我們想像）：

* 將發票寄給該外部開發者的某位客戶。
* 代收款項。
* 再把通知回傳給 API 使用者（外部開發者）。
    * 這會透過從「你的 API」向該外部開發者提供的「外部 API」送出 POST 請求完成（這就是「回呼」）。

## 一般的 **FastAPI** 應用 { #the-normal-fastapi-app }

先看看在加入回呼之前，一個一般的 API 應用會長什麼樣子。

它會有一個接收 `Invoice` body 的「路徑操作」，以及一個查詢參數 `callback_url`，其中包含用於回呼的 URL。

這部分很正常，多數程式碼你應該已經很熟悉了：

* Editor support (completion, etc.), even for nested models
* Data conversion
* Data validation
* Automatic documentation

## Special types and validation { #special-types-and-validation }

Apart from normal singular types like `str`, `int`, `float`, etc. you can use more complex singular types that inherit from `str`.

  - Це буде зроблено шляхом надсилання POST-запиту (з вашого API) до деякого зовнішнього API, наданого тим зовнішнім розробником (це і є «зворотний виклик»).

## Звичайний застосунок FastAPI { #the-normal-fastapi-app }

Спочатку подивімося, як виглядав би звичайний застосунок API до додавання зворотного виклику.

    @DisplayName("Test string sanitization for logging")
    void testSanitizeForLogging() {
        // Test null input
        assertEquals("null", InputValidator.sanitizeForLogging(null));

        // Test normal string without control characters
        assertEquals("test", InputValidator.sanitizeForLogging("test"));

        // Test removal of control characters (they are removed, not replaced with spaces)

        webFsIndexHelper.setCrawlingExecutionInterval(-1000L);
        assertEquals(-1000L, webFsIndexHelper.crawlingExecutionInterval);

        // Test setting out of normal thread priority range
        webFsIndexHelper.setIndexUpdaterPriority(0);
        assertEquals(0, webFsIndexHelper.indexUpdaterPriority);

        webFsIndexHelper.setCrawlerPriority(20);

import org.codelibs.fess.unit.UnitFessTestCase;
import org.junit.jupiter.api.Test;

public class FessUserTest extends UnitFessTestCase {

    @Test
    public void test_getName() {
        // Test with normal user name
        FessUser user = new TestFessUser("testuser", new String[] { "role1" }, new String[] { "group1" }, new String[] { "perm1" });
        assertEquals("testuser", user.getName());

        // Test with empty name

        Exception exception = new Exception() {
            @Override
            public void printStackTrace(java.io.PrintWriter writer) {
                // Simulate a normal stack trace output
                writer.println("Special test exception");
                writer.flush();
            }
        };

        monitorTarget.appendException(buf, exception);

  }

  /**
   * Returns an {@code UnsignedLong} corresponding to a given bit representation. The argument is
   * interpreted as an unsigned 64-bit value. Specifically, the sign bit of {@code bits} is
   * interpreted as a normal bit, and all other bits are treated as usual.
   *
   * <p>If the argument is nonnegative, the returned result will be equal to {@code bits},
   * otherwise, the result will be equal to {@code 2^64 + bits}.
   *

            validator.validateMessageSize(17 * 1024 * 1024, false);
        });
    }

    @Test
    public void testValidString() throws Exception {
        validator.validateString("normal string", 100, "test");
        validator.validateString(null, 100, "test"); // Null should be allowed
        // Should pass without exception
    }

    @Test
    public void testStringTooLong() throws Exception {