PatternTest.java

package com.hanserwei.patterns.facade;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.List;
import org.junit.jupiter.api.Test;

/** 验证本模式的协作契约与边界行为. */
public final class PatternTest {
  /** 一次高层调用协调保存和建立索引. */
  @Test
  void coordinatesSubsystems() {
    DraftStore store = new DraftStore();
    SearchIndex index = new SearchIndex();
    new PublishingFacade(store, index).publish("Java");
    assertEquals(List.of("Java"), store.titles());
    assertTrue(index.contains("Java"));
  }

  /** 校验失败时不能先留下部分存储结果. */
  @Test
  void validatesBeforeSideEffects() {
    DraftStore store = new DraftStore();
    SearchIndex index = new SearchIndex();
    PublishingFacade facade = new PublishingFacade(store, index);
    assertThrows(IllegalArgumentException.class, () -> facade.publish(" "));
    assertTrue(store.titles().isEmpty());
    assertFalse(index.contains(" "));
  }
}