PatternTest.java

package com.hanserwei.patterns.mediator;

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

import java.util.List;
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 {
  /** 一名成员发言，其他成员收到，发送者不收到回声. */
  @Test
  void routesWithoutPeerReferences() {
    ReviewRoom room = new ReviewRoom();
    Reviewer ada = room.join("Ada");
    Reviewer lin = room.join("Lin");
    final Reviewer bo = room.join("Bo");
    ada.comment("LGTM");
    assertTrue(ada.messages().isEmpty());
    assertEquals(List.of("Ada:LGTM"), lin.messages());
    assertEquals(lin.messages(), bo.messages());
  }

  /** 不同评审室之间不会泄漏意见，同名加入也会被拒绝. */
  @Test
  void isolatesRooms() {
    ReviewRoom first = new ReviewRoom();
    Reviewer ada = first.join("Ada");
    Reviewer lin = new ReviewRoom().join("Lin");
    ada.comment("Private");
    assertTrue(lin.messages().isEmpty());
    assertThrows(IllegalArgumentException.class, () -> first.join("Ada"));
  }
}