import java.util.Arrays;
import java.util.Collection;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/** Tests for a directed {@link StandardMutableNetwork} allowing self-loops. */
@AndroidIncompatible
@RunWith(Parameterized.class)
public class StandardMutableDirectedNetworkTest extends AbstractStandardDirectedNetworkTest {

import java.util.Arrays;
import java.util.Collection;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/** Tests for an undirected {@link StandardMutableNetwork}. */
@AndroidIncompatible
@RunWith(Parameterized.class)
public final class StandardMutableUndirectedNetworkTest
    extends AbstractStandardUndirectedNetworkTest {

import static org.junit.Assert.assertThrows;

import com.google.common.testing.NullPointerTester;
import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;

/**
 * Unit test for {@link Atomics}.
 *
 * @author Kurt Alfred Kluever
 */
public class AtomicsTest extends TestCase {

  private static final Object OBJECT = new Object();

  public void testNewReference() throws Exception {

import static com.google.common.truth.Truth.assertWithMessage;

import com.google.common.annotations.GwtIncompatible;
import junit.framework.TestCase;

/**
 * Tests for {@link StandardSystemProperty}.
 *
 * @author Kurt Alfred Kluever
 */
@GwtIncompatible
public class StandardSystemPropertyTest extends TestCase {

  public void testGetKeyMatchesString() {

import com.google.common.collect.testing.features.MapFeature;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.SortedSet;
import org.junit.Ignore;

/**
 * Testers for {@link SortedSetMultimap#asMap}.
 *
 * @author Louis Wasserman
 * @param <K> The key type of the tested multimap.
 * @param <V> The value type of the tested multimap.
 */
@GwtCompatible

import java.util.Arrays;
import java.util.Collection;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/** Tests for a directed {@link StandardMutableNetwork} allowing self-loops. */
@AndroidIncompatible
@RunWith(Parameterized.class)
public class StandardMutableDirectedNetworkTest extends AbstractStandardDirectedNetworkTest {

package com.google.common.graph;

import java.util.AbstractSet;
import java.util.Set;
import javax.annotation.CheckForNull;

/**
 * Abstract base class for an incident edges set that allows different implementations of {@link
 * AbstractSet#iterator()}.
 */
@ElementTypesAreNonnullByDefault
abstract class IncidentEdgeSet<N> extends AbstractSet<EndpointPair<N>> {
  final N node;
  final BaseGraph<N> graph;

    disabled = user_dict["disabled"],
    hashed_password = user_dict["hashed_password"],
)
```

/// info | "说明"

`user_dict` 的说明，详见[**更多模型**一章](../extra-models.md#user_indict){.internal-link target=_blank}。

///

## 返回 Token

`token` 端点的响应必须是 JSON 对象。

响应返回的内容应该包含 `token_type`。本例中用的是**Bearer**Token，因此， Token 类型应为**`bearer`**。

返回内容还应包含 `access_token` 字段，它是包含权限 Token 的字符串。

但 JWT 使用了签名机制。接受令牌时，可以用签名校验令牌。

使用 JWT 创建有效期为一周的令牌。第二天，用户持令牌再次访问时，仍为登录状态。

令牌于一周后过期，届时，用户身份验证就会失败。只有再次登录，才能获得新的令牌。如果用户（或第三方）篡改令牌的过期时间，因为签名不匹配会导致身份验证失败。

如需深入了解 JWT 令牌，了解它的工作方式，请参阅 <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a>。

## 安装 `PyJWT`

安装 `PyJWT`，在 Python 中生成和校验 JWT 令牌：

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info | "说明"

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import junit.framework.Test;
import junit.framework.TestSuite;

/**
 * Generates a test suite covering the {@link Map} implementations in the {@link java.util} package.
 * Can be subclassed to specify tests that should be suppressed.
 *
 * @author Kevin Bourrillion
 */
@GwtIncompatible
public class TestsForMapsInJavaUtil {