PatternTest.java

package com.hanserwei.patterns.chain;

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

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 {
  /** 同时失败时报告链中第一个错误，体现短路顺序. */
  @Test
  void stopsAtFirstFailure() {
    Submission request = new Submission(" ", false);
    assertEquals(
        "blank title", new TitleCheck(new PermissionCheck(null)).check(request).orElseThrow());
    assertEquals(
        "permission denied",
        new PermissionCheck(new TitleCheck(null)).check(request).orElseThrow());
  }

  /** 首节点通过后仍需执行后继；所有节点通过才批准. */
  @Test
  void continuesAfterSuccess() {
    SubmissionCheck chain = new TitleCheck(new PermissionCheck(null));
    assertEquals("permission denied", chain.check(new Submission("Java", false)).orElseThrow());
    assertTrue(chain.check(new Submission("Java", true)).isEmpty());
  }
}