import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

/**
 * JUnit 5 tests for {@link TestLocking}.
 * Tests command line argument parsing and basic field initialization.

import org.junit.Ignore;

/**
 * Tester for {@link ConcurrentMap#remove}. Can't be invoked directly; please see {@link
 * com.google.common.collect.testing.ConcurrentMapTestSuiteBuilder}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.

     * @param lineNumber The one-based index of the line containing the error or {@code -1} if unknown.
     * @param columnNumber The one-based index of the column containing the error or {@code -1} if unknown.
     * @param cause The nested cause of this error, may be {@code null}.
     */
    public ModelParseException(String message, int lineNumber, int columnNumber, Throwable cause) {
        super(message);
        initCause(cause);

     * @param lineNumber The one-based index of the line containing the error or {@code -1} if unknown.
     * @param columnNumber The one-based index of the column containing the error or {@code -1} if unknown.
     * @param cause The nested cause of this error, may be {@code null}.
     */
    public SettingsParseException(String message, int lineNumber, int columnNumber, Throwable cause) {
        super(message);
        initCause(cause);

In diesem Fall wird sie im Pfad `/subapi` gemountet:

{* ../../docs_src/sub_applications/tutorial001_py39.py hl[11, 19] *}

### Die automatische API-Dokumentation testen { #check-the-automatic-api-docs }

Führen Sie nun den `fastapi`-Befehl mit Ihrer Datei aus:

<div class="termy">

```console
$ fastapi dev main.py

import java.util.Map;
import org.junit.Ignore;

/**
 * Tester for {@link Map#remove(Object, Object)}. Can't be invoked directly; please see {@link
 * com.google.common.collect.testing.MapTestSuiteBuilder}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.

**FastAPI** 提供了和 `starlette.testclient` 一样的 `fastapi.testclient`，只是为了方便开发者。但它直接来自Starlette。

///

/// tip | 提示

除了发送请求之外，如果你还想测试时在FastAPI应用中调用 `async` 函数（例如异步数据库函数）， 可以在高级教程中看下 [Async Tests](../advanced/async-tests.md){.internal-link target=_blank} 。

///

## 分离测试

在实际应用中，你可能会把你的测试放在另一个文件里。

您的**FastAPI**应用程序也可能由一些文件/模块组成等等。

### **FastAPI** app 文件

        return buf;
    }

    // Provide a common OID for tests (Kerberos V5 mechanism OID encoded in DER)
    private static ASN1ObjectIdentifier testOid() {
        return new ASN1ObjectIdentifier("1.2.840.113554.1.2.2");
    }

    private static byte[] oidDer() {
        // Full DER encoding of the OID
        try {
            return testOid().toASN1Primitive().getEncoded();
        } catch (java.io.IOException e) {

      for (int i = 0; i < expected.length; i++) {
        assertEquals(expected[i], got[i]);
      }
    }
  }

  // Assumes that AbstractNonStreamingHashFunction works properly (must be tested elsewhere!)
  private static class Control extends AbstractNonStreamingHashFunction {
    @Override
    public HashCode hashBytes(byte[] input, int off, int len) {

        });
  }

  public void testNullPointers() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(BloomFilter.create(Funnels.unencodedCharsFunnel(), 100));
    tester.testAllPublicStaticMethods(BloomFilter.class);
  }

  /** Tests that we never get an optimal hashes number of zero. */
  public void testOptimalHashes() {