implement scrap and ship skeleton

src/test/ScrapTest.cpp

@@ -0,0 +1,83 @@
+#include "catch.hpp"
+
+#include <QVector2D>
+
+#include "EntityId.h"
+#include "Scrap.h"
+#include "ScrapSystem.h"
+
+// ---------------------------------------------------------------------------
+// Spawn
+// ---------------------------------------------------------------------------
+
+TEST_CASE("ScrapSystem: spawn returns a findable scrap with correct fields", "[scrap]")
+{
+    EntityId nextId = 1;
+    ScrapSystem ss([&nextId]() { return nextId++; });
+
+    const EntityId id = ss.spawn(QVector2D(3.0f, 4.0f), 5, 100);
+    const Scrap* s = ss.findScrap(id);
+
+    REQUIRE(s != nullptr);
+    REQUIRE(s->amount    == 5);
+    REQUIRE(s->despawnAt == 100);
+}
+
+// ---------------------------------------------------------------------------
+// Despawn timing
+// ---------------------------------------------------------------------------
+
+TEST_CASE("ScrapSystem: scrap still present one tick before despawnAt", "[scrap]")
+{
+    EntityId nextId = 1;
+    ScrapSystem ss([&nextId]() { return nextId++; });
+
+    const EntityId id = ss.spawn(QVector2D(0.0f, 0.0f), 1, 50);
+
+    ss.tickDespawn(49);
+    REQUIRE(ss.findScrap(id) != nullptr);
+}
+
+TEST_CASE("ScrapSystem: scrap removed at despawnAt tick", "[scrap]")
+{
+    EntityId nextId = 1;
+    ScrapSystem ss([&nextId]() { return nextId++; });
+
+    const EntityId id = ss.spawn(QVector2D(0.0f, 0.0f), 1, 50);
+
+    ss.tickDespawn(50);
+    REQUIRE(ss.findScrap(id) == nullptr);
+}
+
+// ---------------------------------------------------------------------------
+// Selective removal
+// ---------------------------------------------------------------------------
+
+TEST_CASE("ScrapSystem: tickDespawn removes only expired scraps", "[scrap]")
+{
+    EntityId nextId = 1;
+    ScrapSystem ss([&nextId]() { return nextId++; });
+
+    const EntityId earlyId = ss.spawn(QVector2D(0.0f, 0.0f), 1, 30);
+    const EntityId lateId  = ss.spawn(QVector2D(1.0f, 0.0f), 2, 60);
+
+    ss.tickDespawn(30);
+
+    REQUIRE(ss.findScrap(earlyId) == nullptr);
+    REQUIRE(ss.findScrap(lateId)  != nullptr);
+}
+
+// ---------------------------------------------------------------------------
+// Entity ids
+// ---------------------------------------------------------------------------
+
+TEST_CASE("ScrapSystem: spawned scraps receive strictly increasing entity ids", "[scrap]")
+{
+    EntityId nextId = 1;
+    ScrapSystem ss([&nextId]() { return nextId++; });
+
+    const EntityId id1 = ss.spawn(QVector2D(0.0f, 0.0f), 1, 100);
+    const EntityId id2 = ss.spawn(QVector2D(1.0f, 0.0f), 2, 200);
+
+    REQUIRE(id2 > id1);
+}