? new ReentrantLock(fair)
          // requireNonNull is safe because createNodes inserts an entry for every E.
          // (If the caller passes `null` for the `rank` parameter, this will throw, but that's OK.)
          : new CycleDetectingReentrantLock(requireNonNull(lockGraphNodes.get(rank)), fair);
    }

    /** Equivalent to {@code newReentrantReadWriteLock(rank, false)}. */

	}

	if len(userSchema.Relationships.Relations) != 1 {
		t.Fatalf("expects 1 relations, but got %v", len(userSchema.Relationships.Relations))
	}

	if createdByRel, ok := userSchema.Relationships.Relations["CreatedBy"]; ok {
		if createdByRel.FieldSchema != userSchema {
			t.Fatalf("expects same field schema, but got new %p, old %p", createdByRel.FieldSchema, userSchema)
		}
	} else {

```

⏮️ 🎻 💪 ⚗ 🕳 💖:

```JSON
{
    "description": "Payment celebration",
    "paid": true
}
```

& ⚫️ 🔜 ⌛ 📨 ⚪️➡️ 👈 *🔢 🛠️* ⏮️ 🎻 💪 💖:

```JSON
{
    "ok": true
}
```

/// tip

👀 ❔ ⏲ 📛 ⚙️ 🔌 📛 📨 🔢 🔢 `callback_url` (`https://www.external.org/events`) & 🧾 `id` ⚪️➡️ 🔘 🎻 💪 (`2expen51ve`).

///

### 🚮 ⏲ 📻

			size:       4,
			actualSize: 4,
			md5hex:     "e2fc714c4727ee9395f324cd2e7f331f",
			success:    true,
		},
		{
			desc:       "Nothing, all ok",
			src:        bytes.NewReader([]byte("abcd")),
			size:       4,
			actualSize: 4,
			success:    true,
		},
		{
			desc:       "Nested, size mismatch",

    response = client.get(
        "/status/", headers={"Authorization": f"Bearer {access_token}"}
    )
    assert response.status_code == 200, response.text
    assert response.json() == {"status": "ok"}


@needs_py310
def test_read_system_status_no_token(client: TestClient):
    response = client.get("/status/")
    assert response.status_code == 401, response.text

        )

        # Delete a hero
        response = client.delete(f"/heroes/{hero_id}")
        assert response.status_code == 200, response.text
        assert response.json() == snapshot({"ok": True})

        # The hero is no longer found
        response = client.get(f"/heroes/{hero_id}")
        assert response.status_code == 404, response.text

        # Delete a hero that does not exist

	// in this case the CNI will be invoked soon and provide us with the netns.
	openNetns = s.currentPodSnapshot.Get(string(pod.UID))
	if openNetns == nil {
		return nil, fmt.Errorf("can't find netns for pod, this is ok if this is a newly created pod (%w)", ErrPodNotFound)
	}

	return openNetns, nil
}

// AddPodToMesh adds a pod to mesh by
// 1. Getting the netns

```

JSON 请求体包含如下内容：

```JSON
{
    "description": "Payment celebration",
    "paid": true
}
```

它会预期*外部 API* 的响应包含如下 JSON 请求体：

```JSON
{
    "ok": true
}
```

/// tip | "提示"

注意，回调 URL包含 `callback_url` （`https://www.external.org/events`）中的查询参数，还有 JSON 请求体内部的发票 ID（`2expen51ve`）。

///

### 添加回调路由

</p>

<pre>
v, ok = x.(T)
v, ok := x.(T)
var v, ok = x.(T)
var v, ok interface{} = x.(T) // dynamic types of v and ok are T and bool
</pre>

<p>
yields an additional untyped boolean value. The value of <code>ok</code> is <code>true</code>
if the assertion holds. Otherwise it is <code>false</code> and the value of <code>v</code> is

		t.Errorf("ModifiedTime: got %d, want %d\n", got, want)
	}
	if got, want := fh2.ModifiedDate, fh.ModifiedDate; got != want {
		t.Errorf("ModifiedDate: got %d, want %d\n", got, want)
	}

	if sysfh, ok := fi.Sys().(*FileHeader); !ok && sysfh != fh {
		t.Errorf("Sys didn't return original *FileHeader")
	}
}

func TestFileHeaderRoundTrip(t *testing.T) {
	fh := &FileHeader{
		Name:             "foo.txt",