PatternTest.java

package com.hanserwei.patterns.flyweight;

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

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 {
  /** 同键共享身份，不同键独立创建. */
  @Test
  void reusesIntrinsicState() {
    StyleFactory factory = new StyleFactory();
    assertSame(factory.get("Serif"), factory.get("Serif"));
    assertNotSame(factory.get("Serif"), factory.get("Mono"));
  }

  /** 共享样式不能覆盖另一个字形的坐标. */
  @Test
  void keepsCoordinatesExternal() {
    TextStyle style = new StyleFactory().get("Serif");
    Glyph first = new Glyph('A', 10, style);
    Glyph second = new Glyph('B', 20, style);
    assertEquals("Serif:A@10", first.draw());
    assertEquals("Serif:B@20", second.draw());
    assertEquals("Serif:A@10", first.draw());
  }
}