feat(game): world-state engine (GameState, Condition/Effect, evaluator/applier)

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

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/ConditionsTest.java

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+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ConditionsTest {
+    private GameContext ctx() {
+        Player p = new Player(new Room("k", "K", "d"), 0);
+        return new GameContext(null, p, new TestIO());
+    }
+
+    @Test
+    void flagAndNotFlag() {
+        GameContext ctx = ctx();
+        ctx.getState().set("power_on");
+        assertThat(Conditions.holds(new Condition(Condition.Type.FLAG, "power_on"), ctx)).isTrue();
+        assertThat(Conditions.holds(new Condition(Condition.Type.NOT_FLAG, "power_on"), ctx)).isFalse();
+        assertThat(Conditions.holds(new Condition(Condition.Type.NOT_FLAG, "x"), ctx)).isTrue();
+    }
+
+    @Test
+    void hasItem() {
+        GameContext ctx = ctx();
+        ctx.getPlayer().addItem(PlainItem.builder().id("lamp").name("Lamp").description("d").build());
+        assertThat(Conditions.holds(new Condition(Condition.Type.HAS_ITEM, "lamp"), ctx)).isTrue();
+        assertThat(Conditions.holds(new Condition(Condition.Type.HAS_ITEM, "key"), ctx)).isFalse();
+    }
+
+    @Test
+    void allRequiresEveryConditionAndEmptyIsTrue() {
+        GameContext ctx = ctx();
+        ctx.getState().set("a");
+        assertThat(Conditions.all(List.of(), ctx)).isTrue();
+        assertThat(Conditions.all(List.of(new Condition(Condition.Type.FLAG, "a")), ctx)).isTrue();
+        assertThat(Conditions.all(List.of(
+                new Condition(Condition.Type.FLAG, "a"),
+                new Condition(Condition.Type.FLAG, "b")), ctx)).isFalse();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/EffectsTest.java

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+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+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 thb.jeanluc.adventure.model.World;
+import thb.jeanluc.adventure.model.item.Item;
+import thb.jeanluc.adventure.model.item.PlainItem;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class EffectsTest {
+    private GameContext ctx(Map<String, Item> items) {
+        Player p = new Player(new Room("k", "K", "d"), 0);
+        World w = new World(Map.of(), items, Map.of(), "t", "w");
+        return new GameContext(w, p, new TestIO());
+    }
+
+    @Test
+    void setAndClearFlag() {
+        GameContext ctx = ctx(Map.of());
+        Effects.applyAll(List.of(new Effect(Effect.Type.SET_FLAG, "power_on")), ctx);
+        assertThat(ctx.getState().isSet("power_on")).isTrue();
+        Effects.apply(new Effect(Effect.Type.CLEAR_FLAG, "power_on"), ctx);
+        assertThat(ctx.getState().isSet("power_on")).isFalse();
+    }
+
+    @Test
+    void giveAndRemoveItem() {
+        Item key = PlainItem.builder().id("key").name("Key").description("d").build();
+        GameContext ctx = ctx(Map.of("key", key));
+        Effects.apply(new Effect(Effect.Type.GIVE_ITEM, "key"), ctx);
+        assertThat(ctx.getPlayer().hasItem("key")).isTrue();
+        Effects.apply(new Effect(Effect.Type.REMOVE_ITEM, "key"), ctx);
+        assertThat(ctx.getPlayer().hasItem("key")).isFalse();
+    }
+
+    @Test
+    void giveUnknownItemIsTolerated() {
+        GameContext ctx = ctx(Map.of());
+        Effects.apply(new Effect(Effect.Type.GIVE_ITEM, "ghost"), ctx);
+        assertThat(ctx.getPlayer().hasItem("ghost")).isFalse();
+    }
+
+    @Test
+    void sayWritesToIo() {
+        GameContext ctx = ctx(Map.of());
+        Effects.apply(new Effect(Effect.Type.SAY, "boo"), ctx);
+        assertThat(((TestIO) ctx.getIo()).allOutput()).contains("boo");
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/GameStateTest.java

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+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class GameStateTest {
+    @Test
+    void setIsSetClear() {
+        GameState s = new GameState();
+        assertThat(s.isSet("power_on")).isFalse();
+        s.set("power_on");
+        assertThat(s.isSet("power_on")).isTrue();
+        s.clear("power_on");
+        assertThat(s.isSet("power_on")).isFalse();
+    }
+}