expected := false
	if locked != expected {
		t.Errorf("TestDualWriteLockTimedOut(): \nexpected %#v\ngot      %#v", expected, locked)
	}
}

// Test cases below are copied 1 to 1 from sync/rwmutex_test.go (adapted to use DRWMutex)

// Borrowed from rwmutex_test.go
func parallelReader(ctx context.Context, m *DRWMutex, clocked, cunlock, cdone chan bool) {

# 流式数据 { #stream-data }

如果你要流式传输可以结构化为 JSON 的数据，你应该[流式传输 JSON Lines](../tutorial/stream-json-lines.md)。

但如果你想流式传输纯二进制数据或字符串，可以按下面的方法操作。

/// info | 信息

自 FastAPI 0.134.0 起新增。

///

## 使用场景 { #use-cases }

如果你想流式传输纯字符串，例如直接来自某个 AI LLM 服务的输出，可以使用它。

你也可以用它来流式传输大型二进制文件，在读取的同时按块发送，无需一次性把所有内容读入内存。

你还可以用这种方式流式传输视频或音频，甚至可以在处理的同时生成并发送。

## 使用 `yield` 的 `StreamingResponse` { #a-streamingresponse-with-yield }

   *
   * Our usages should at least be *relatively* safe: Typically, threads started by a test are dying
   * at the end of the test, so there is no object state put at risk by stopping the threads
   * abruptly. In other cases, a test may put a thread into an uninterruptible operation
   * intentionally, so there is no other way to clean up these threads. (The better solution,

  }

  /**
   * Tests that events are distributed to any subscribers to their type or any supertype, including
   * interfaces and superclasses.
   *
   * <p>Also checks delivery ordering in such cases.
   */
  public void testPolymorphicDistribution() {
    // Three catchers for related types String, Object, and Comparable<?>.
    // String isa Object
    // String isa Comparable<?>
    // Comparable<?> isa Object

  }

  /**
   * Tests that events are distributed to any subscribers to their type or any supertype, including
   * interfaces and superclasses.
   *
   * <p>Also checks delivery ordering in such cases.
   */
  public void testPolymorphicDistribution() {
    // Three catchers for related types String, Object, and Comparable<?>.
    // String isa Object
    // String isa Comparable<?>
    // Comparable<?> isa Object

```

### Running Tests with Coverage

```bash
mvn clean jacoco:prepare-agent test jacoco:report
```

Coverage reports are generated in `target/site/jacoco/`.

## Common Use Cases

### E-commerce Search

```java
// Product search suggestions
SuggestItem product = new SuggestItem(
    new String[]{"iPhone 15 Pro", "Apple iPhone 15 Pro"},

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;
import org.opensearch.action.admin.indices.get.GetIndexResponse;

/**
 * Tests for Suggester index lifecycle operations including edge cases.
 * Covers: createIndexIfNothing, createNextIndex, switchIndex, removeDisableIndices
 */
public class SuggesterIndexLifecycleTest {
    static OpenSearchRunner runner;

    @Rule

///

/// note | 技術詳細

各 JSON オブジェクトは改行で区切られるため、内容にリテラルな改行文字は含められません。ですが、エスケープした改行（`\n`）は含められます。これは JSON 標準の一部です。

とはいえ、通常は気にする必要はありません。自動で処理されますので、読み進めてください。🤓

///

## ユースケース { #use-cases }

これは **AI LLM** サービス、**ログ**や**テレメトリ**、あるいは **JSON** アイテムとして構造化できる他の種類のデータをストリームするのに使えます。

/// tip | 豆知識

動画や音声などのバイナリデータをストリームしたい場合は、上級ガイドを参照してください: [データのストリーム](../advanced/stream-data.md)。

///

		}
		if ETag := reader.ETag(); !Equal(ETag, test.ETag) {
			t.Fatalf("Test %d: ETag mismatch: got %q - want %q", i, ETag, test.ETag)
		}
	}
}

var multipartTests = []struct { // Test cases have been generated using AWS S3
	ETags     []ETag
	Multipart ETag
}{
	{
		ETags:     []ETag{},
		Multipart: ETag{},
	},
	{
		ETags:     []ETag{must("b10a8db164e0754105b7a99be72e3fe5")},

        assertNotNull(newInstance);

        // Verify default values work for new instance
        assertEquals("warm", newInstance.getLastaDiSmartDeployMode());
    }

    // Test edge cases for mail configuration
    public void xtest_mailConfiguration_edgeCases() {
        // Test with empty host and port
        FessEnv.SimpleImpl emptyMailEnv = new FessEnv.SimpleImpl() {