design-patterns-java25/src/test/java/com/hanserwei/patterns/state/PatternTest.java at main · Hanserwei/design-patterns-java25 · GitHub

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package com.hanserwei.patterns.state;

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

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 {
  /** 合法路径由状态对象推进. */
  @Test
  void followsLifecycle() {
    Manuscript manuscript = new Manuscript();
    assertEquals("draft", manuscript.stateName());
    manuscript.publish();
    assertEquals("published", manuscript.stateName());
    manuscript.archive();
    assertEquals("archived", manuscript.stateName());
  }

  /** 非法动作拒绝执行，失败不改变当前状态. */
  @Test
  void rejectsInvalidTransitions() {
    Manuscript manuscript = new Manuscript();
    assertThrows(IllegalStateException.class, manuscript::archive);
    assertEquals("draft", manuscript.stateName());
    manuscript.publish();
    assertThrows(IllegalStateException.class, manuscript::publish);
    assertEquals("published", manuscript.stateName());
    manuscript.archive();
    assertThrows(IllegalStateException.class, manuscript::publish);
    assertThrows(IllegalStateException.class, manuscript::archive);
    assertEquals("archived", manuscript.stateName());
  }
}