Properly link flecs library

engine/libs/flecs/test/api/src/Count.c

@@ -0,0 +1,64 @@
+#include <api.h>
+
+void Count_count_empty(void) {
+    ecs_world_t *world = ecs_mini();
+
+    test_int(ecs_count(world, 0), 0);
+
+    ecs_fini(world);
+}
+
+void Count_count_w_entity_0(void) {
+    ecs_world_t *world = ecs_mini();
+
+    test_int(ecs_count_id(world, 0), 0);
+
+    ecs_fini(world);
+}
+
+void Count_count_1_component(void) {
+    ecs_world_t *world = ecs_mini();
+
+    ECS_COMPONENT(world, Position);
+
+    ECS_ENTITY(world, e1, Position);
+    ECS_ENTITY(world, e2, Position);
+
+    test_int(ecs_count(world, Position), 2);
+
+    ecs_fini(world);
+}
+
+void Count_count_disabled(void) {
+    ecs_world_t *world = ecs_mini();
+
+    ECS_COMPONENT(world, Position);
+
+    ecs_entity_t e1 = ecs_new(world, Position);
+    ecs_new(world, Position);
+
+    test_int(ecs_count(world, Position), 2);
+
+    ecs_enable(world, e1, false);
+
+    test_int(ecs_count(world, Position), 2);
+
+    ecs_fini(world);
+}
+
+void Count_count_prefab(void) {
+    ecs_world_t *world = ecs_mini();
+
+    ECS_COMPONENT(world, Position);
+
+    ecs_entity_t e1 = ecs_new(world, Position);
+    ecs_new(world, Position);
+
+    test_int(ecs_count(world, Position), 2);
+
+    ecs_add_id(world, e1, EcsPrefab);
+
+    test_int(ecs_count(world, Position), 2);
+
+    ecs_fini(world);
+}