PatternTest.java

package com.hanserwei.patterns.visitor;

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

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 {
  /** 通过元素接口访问时，仍分派到实际元素对应的重载. */
  @Test
  void dispatchesOnBothTypes() {
    ContentElement paragraph = new Paragraph("Java");
    ContentElement code = new CodeBlock("x");
    assertEquals("Java", paragraph.accept(new MarkdownVisitor()));
    assertEquals("```\nx\n```", code.accept(new MarkdownVisitor()));
    assertEquals("paragraph:4", paragraph.accept(new SummaryVisitor()));
    assertEquals("code:1", code.accept(new SummaryVisitor()));
  }

  /** 代码包含反引号时增加围栏长度，摘要正确处理补充平面字符. */
  @Test
  void handlesContentBoundaries() {
    assertEquals("````\n```\n````", new CodeBlock("```").accept(new MarkdownVisitor()));
    assertEquals("paragraph:1", new Paragraph("😀").accept(new SummaryVisitor()));
  }
}