## 官方指南 { #official-guide }

Pydantic 提供從 v1 遷移到 v2 的官方[遷移指南](https://docs.pydantic.dev/latest/migration/)。

其中包含變更內容、驗證如何更正確且更嚴格、可能的注意事項等。

你可以先閱讀以更好理解具體變更。

## 測試 { #tests }

確保你的應用有[測試](../tutorial/testing.md)，並在 CI（持續整合）上執行。

如此一來，你可以升級後確認一切仍如預期運作。

## `bump-pydantic` { #bump-pydantic }

在許多情況下，若你使用的是未自訂的標準 Pydantic 模型，多數遷移步驟都能自動化完成。

import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * @author Charles Fry
 */
@SuppressWarnings("deprecation") // many tests of deprecated methods
@NullUnmarked
public class MapMakerInternalMapTest extends TestCase {

  static final int SMALL_MAX_SIZE = DRAIN_THRESHOLD * 5;

  private static <K, V>

import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * @author Charles Fry
 */
@SuppressWarnings("deprecation") // many tests of deprecated methods
@NullUnmarked
public class MapMakerInternalMapTest extends TestCase {

  static final int SMALL_MAX_SIZE = DRAIN_THRESHOLD * 5;

  private static <K, V>

import org.codelibs.core.misc.Pair;
import org.codelibs.fess.crawler.entity.RequestData;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.junit.jupiter.api.Test;

/**
 * Test class for FessCrawlerThread.
 * Tests HTTP status code constants, null handling, and anchor processing.
 */
public class FessCrawlerThreadTest extends UnitFessTestCase {

    @Test
    public void test_getClientRuleList() {

import java.util.Map.Entry;
import java.util.Set;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullMarked;

/**
 * Tests for {@link HashBiMap}.
 *
 * @author Mike Bostock
 */
@GwtCompatible
@NullMarked
public class HashBiMapTest extends TestCase {

  @J2ktIncompatible
  @AndroidIncompatible // test-suite builders

import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import java.math.BigInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@code UnsignedLong}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullUnmarked
public class UnsignedLongTest extends TestCase {
  private static final ImmutableSet<Long> TEST_LONGS;

import jcifs.internal.smb2.ServerMessageBlock2Response;
import jcifs.internal.util.SMBUtil;

/**
 * Test class for Smb2SetInfoResponse functionality
 */
@DisplayName("Smb2SetInfoResponse Tests")
@MockitoSettings(strictness = Strictness.LENIENT)
class Smb2SetInfoResponseTest {

    private Configuration mockConfig;
    private Smb2SetInfoResponse response;

    @BeforeEach
    void setUp() {

package tests_test

import (
	"database/sql/driver"
	"encoding/json"
	"errors"
	"reflect"
	"testing"
	"time"

	"gorm.io/gorm"
	. "gorm.io/gorm/utils/tests"
)

func TestEmbeddedStruct(t *testing.T) {
	type ReadOnly struct {
		ReadOnly *bool
	}

	type BasePost struct {
		Id    int64
		Title string
		URL   string
		ReadOnly
	}

	type Author struct {
		ID    string
		Name  string

  }

  /**
   * The supplied multimap will be mutated and an unmodifiable instance used in its stead. If the
   * multimap does not support null keys or values, alternatives may be specified for tests
   * involving nulls.
   */
  private static void checkUnmodifiableMultimap(
      Multimap<@Nullable String, @Nullable Integer> multimap,
      boolean permitsDuplicates,
      @Nullable String nullKey,

import java.util.concurrent.TimeUnit;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Generated tests for {@link Monitor}.
 *
 * <p>This test class generates all of its own test cases in the {@link #suite()} method. Every
 * {@code enterXxx}, {@code tryEnterXxx}, and {@code waitForXxx} method of the {@code Monitor} class