advance towards enemy buildings

src/test/BehaviorSystemTest.cpp

@@ -3,6 +3,7 @@
 #include <random>
 
 #include <QPoint>
+#include <QSize>
 #include <QVector2D>
 
 #include "AdvanceBehavior.h"
@@ -383,6 +384,58 @@ TEST_CASE("BehaviorSystem: enemy ship with no target advances leftward",
     REQUIRE(intent(f.admin, enemy).target.x() < 0.0f);
 }
 
+TEST_CASE("BehaviorSystem: advancing ship targets center between enemy defence stations",
+          "[behavior]")
+{
+    Fixture f;
+
+    // Two enemy defence stations far from the ship (out of sensor/attack range),
+    // 1x1 footprint so each center is anchor + (0.5, 0.5).
+    const std::vector<QPoint> body{QPoint(0, 0)};
+    f.admin.spawnStation(QPoint(1000, 10), QSize(1, 1), body, 100.0f, 100.0f, /*isEnemy=*/true);
+    f.admin.spawnStation(QPoint(1000, 30), QSize(1, 1), body, 100.0f, 100.0f, /*isEnemy=*/true);
+
+    const entt::entity player = f.ships.spawn("interceptor", 1, QVector2D(0.0f, 0.0f),
+                                              /*isEnemy=*/false);
+    // Player ships rally until departure; drop Rally so Advance is the fallback.
+    f.ships.triggerRallyDeparture();
+
+    f.decide();
+
+    // Centers (1000.5, 10.5) and (1000.5, 30.5) -> midpoint (1000.5, 20.5).
+    REQUIRE(winnerOf(f.admin, player) == BehaviorKind::Advance);
+    REQUIRE(intent(f.admin, player).active);
+    REQUIRE(intent(f.admin, player).target.x() == Approx(1000.5f));
+    REQUIRE(intent(f.admin, player).target.y() == Approx(20.5f));
+}
+
+TEST_CASE("BehaviorSystem: advancing ship falls back to enemy HQ, then off-world",
+          "[behavior]")
+{
+    Fixture f;
+
+    // Player HQ proxy (isEnemy=false) but no player defence stations.
+    const QVector2D hqPos(5.0f, 7.0f);
+    const entt::entity hq = f.admin.spawnHqProxy(hqPos, 100.0f, 100.0f);
+
+    const entt::entity enemy = f.ships.spawn("interceptor", 1, QVector2D(1000.0f, 0.0f),
+                                             /*isEnemy=*/true);
+
+    f.decide();
+
+    REQUIRE(winnerOf(f.admin, enemy) == BehaviorKind::Advance);
+    REQUIRE(intent(f.admin, enemy).active);
+    REQUIRE(intent(f.admin, enemy).target.x() == Approx(hqPos.x()));
+    REQUIRE(intent(f.admin, enemy).target.y() == Approx(hqPos.y()));
+
+    // With the HQ gone too, the ship falls back to advancing off-world (leftward).
+    f.admin.get<HealthComponent>(hq).hp = 0.0f;
+    f.decide();
+
+    REQUIRE(winnerOf(f.admin, enemy) == BehaviorKind::Advance);
+    REQUIRE(intent(f.admin, enemy).target.x() < 0.0f);
+}
+
 // ---------------------------------------------------------------------------
 // RepairBehavior
 // ---------------------------------------------------------------------------