PatternTest.java

package com.hanserwei.patterns.bridge;

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 {
  /** 两个业务类型可以分别搭配两种实现，无需四个组合子类. */
  @Test
  void combinesIndependentDimensions() {
    assertEquals("INFO: ready", new InfoNotice(new TextRenderer()).display("ready"));
    assertEquals("## INFO\nready", new InfoNotice(new MarkdownRenderer()).display("ready"));
    assertEquals("ALERT: ready", new AlertNotice(new TextRenderer()).display("ready"));
    assertEquals("## ALERT\nready", new AlertNotice(new MarkdownRenderer()).display("ready"));
  }

  /** 业务抽象不接受缺失的实现对象. */
  @Test
  void rejectsMissingRenderer() {
    assertThrows(NullPointerException.class, () -> new AlertNotice(null));
  }
}