feat: switchable items apply effects when turned on

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/test/java/thb/jeanluc/adventure/model/item/SwitchEffectsTest.java

@@ -0,0 +1,28 @@
+package thb.jeanluc.adventure.model.item;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Effect;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class SwitchEffectsTest {
+    @Test
+    void switchingOnAppliesEffects() {
+        SwitchableItem breaker = SwitchableItem.builder()
+                .id("breaker").name("Breaker").description("d")
+                .state(false).onText("hums to life").offText("off")
+                .effects(List.of(new Effect(Effect.Type.SET_FLAG, "power_on")))
+                .build();
+        Player player = new Player(new Room("k", "K", "d"), 0);
+        GameContext ctx = new GameContext(null, player, new TestIO());
+
+        breaker.use(ctx);
+        assertThat(ctx.getState().isSet("power_on")).isTrue();
+    }
+}