throw if modules are referenced that don't exist in config

bin/app/data/config/buildings.toml

@@ -41,7 +41,7 @@ cost = 20
 player_placeable = true
 construction_time_seconds = 1
 surface_mask = [
-  "AA ",
+  "AA",
   " v",
 ]
 

bin/app/data/config/modules.toml

@@ -1,9 +1,119 @@
 [[module]]
-id = "laser_cannon"
+id = "armor_plate"
+surface_mask = ["OO"]
+materials = [{item = "armor_plate_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 3
+threat_cost = 20.0
+fill_color = "#808080"
+glyph = "A"
+
+[module.health]
+added_hp_formula = "40"
+
+
+[[module]]
+id = "sensor_booster"
 surface_mask = ["O"]
-materials = [{item = "laser_cannon_module", amount = 1}]
+materials = [{item = "sensor_booster_module", amount = 1}]
 player_production_level = 1
 production_time_seconds = 2
+threat_cost = 1.0
+fill_color = "#40A0FF"
+glyph = "S"
+
+[module.sensor]
+added_sensor_range_m_formula = "50"
+
+
+[[module]]
+id = "manuvering_thrusters"
+surface_mask = ["O"]
+materials = [{item = "manuvering_thrusters_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 2
+threat_cost = 1.0
+fill_color = "#40A0FF"
+glyph = "Mt"
+
+[module.movement]
+multiplied_speed_mps_formula = "1.2"
+added_maneuvering_acceleration_mpss_formula = "10"
+
+
+[[module]]
+id = "afterburner"
+surface_mask = ["O"]
+materials = [{item = "afterburner_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 2
+threat_cost = 1.0
+fill_color = "#40A0FF"
+glyph = "Ab"
+
+[module.movement]
+multiplied_speed_mps_formula = "1.6"
+added_main_acceleration_mpss_formula = "60"
+
+
+[[module]]
+id = "weapon_upgrade"
+surface_mask = [
+    "OO",
+    "O ",
+]
+materials = [{item = "weapon_upgrade_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 4
+threat_cost = 10.0
+fill_color = "#FF4040"
+glyph = "Wu"
+
+[module.weapon]
+multiplied_damage_formula = "1.2"
+
+
+[[module]]
+id = "weapon_primer"
+surface_mask = [
+    "OO",
+    "O ",
+]
+materials = [{item = "weapon_primer_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 4
+threat_cost = 10.0
+fill_color = "#FF4040"
+glyph = "Wp"
+
+[module.weapon]
+multiplied_attack_rate_hz_formula = "1.2"
+
+
+[[module]]
+id = "weapon_stabilizer"
+surface_mask = [
+    "OO",
+    "O ",
+]
+materials = [{item = "weapon_stabilizer_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 4
+threat_cost = 10.0
+fill_color = "#FF4040"
+glyph = "Ws"
+
+[module.weapon]
+multiplied_attack_range_m_formula = "1.5"
+multiplied_attack_rate_hz_formula = "0.8"
+
+
+[[module]]
+id = "laser_cannon_xs"
+surface_mask = ["O"]
+materials = [{item = "laser_cannon_xs_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 0.5
 threat_cost = 5.0
 fill_color = "#FF8040"
 glyph = "L"
@@ -13,6 +123,25 @@ damage_formula = "2"
 attack_range_m_formula = "50"
 attack_rate_hz_formula = "2.0"
 
+
+[[module]]
+id = "laser_cannon_s"
+surface_mask = [
+    "OO",
+    "OO"]
+materials = [{item = "laser_cannon_s_module", amount = 1}]
+player_production_level = 1
+production_time_seconds = 0.5
+threat_cost = 30.0
+fill_color = "#FF8040"
+glyph = "L"
+
+[module.weapon]
+damage_formula = "10"
+attack_range_m_formula = "70"
+attack_rate_hz_formula = "1.5"
+
+
 [[module]]
 id = "salvager"
 surface_mask = ["O"]
@@ -28,6 +157,7 @@ collection_range_m_formula = "500"
 cargo_capacity_formula = "10"
 collection_rate_hz_formula = "0.5"
 
+
 [[module]]
 id = "repair_tool"
 surface_mask = ["O"]

bin/app/data/config/recipes.toml

@@ -31,20 +31,27 @@ id = "circuit_board"
 building = "assembler"
 inputs = [{item = "iron_ingot", amount = 1}, {item = "copper_ingot", amount = 2}]
 outputs = [{item = "circuit_board", amount = 1}]
-duration_seconds = 5.0
+duration_seconds = 2.0
 
 [[recipe]]
 id = "drone_hull"
 building = "assembler"
 inputs = [{item = "iron_ingot", amount = 5}, {item = "circuit_board", amount = 1}]
 outputs = [{item = "drone_hull", amount = 1}]
-duration_seconds = 12.0
+duration_seconds = 4.0
 
 [[recipe]]
-id = "laser_cannon_module"
+id = "laser_cannon_xs_module"
 building = "assembler"
 inputs = [{item = "iron_ingot", amount = 2}, {item = "circuit_board", amount = 1}]
-outputs = [{item = "laser_cannon_module", amount = 1}]
+outputs = [{item = "laser_cannon_xs_module", amount = 1}]
+duration_seconds = 3.0
+
+[[recipe]]
+id = "laser_cannon_s_module"
+building = "assembler"
+inputs = [{item = "iron_ingot", amount = 4}, {item = "circuit_board", amount = 2}]
+outputs = [{item = "laser_cannon_s_module", amount = 1}]
 duration_seconds = 6.0
 
 [[recipe]]

bin/balancing/data/balancing.toml

@@ -12,7 +12,7 @@ enemy_buffer_width_tiles = 10
     level = 1
     count = 5
     modules = [
-      {type = "laser_cannon",  x = 1, y = 1, rotation = "east"},
+      {type = "laser_cannon_xs",  x = 1, y = 1, rotation = "east"},
     ]
 
   [[arena.team]]
@@ -20,11 +20,50 @@ enemy_buffer_width_tiles = 10
     [[arena.team.ship]]
     schematic = "drone"
     level = 1
-    count = 1
+    count = 2
     modules = [
-      {type = "laser_cannon",  x = 1, y = 1, rotation = "east"},
+      {type = "laser_cannon_xs",  x = 1, y = 1, rotation = "east"},
+      {type = "weapon_stabilizer",  x = 1, y = 1, rotation = "east"},
+      {type = "weapon_stabilizer",  x = 1, y = 1, rotation = "east"},
+      {type = "weapon_upgrade",  x = 1, y = 1, rotation = "east"},
+      {type = "sensor_booster",  x = 1, y = 1, rotation = "east"},
+      {type = "sensor_booster",  x = 1, y = 1, rotation = "east"},
     ]
 
+[[arena]]
+name = "Fighters vs Supported"
+height_tiles = 20
+player_buffer_width_tiles = 10
+contest_zone_width_tiles = 60
+enemy_buffer_width_tiles = 10
+
+  [[arena.team]]
+  name = "Fighters"
+    [[arena.team.ship]]
+    schematic = "drone"
+    level = 1
+    count = 5
+    modules = [
+      {type = "laser_cannon_xs",  x = 1, y = 1, rotation = "east"},
+    ]
+
+  [[arena.team]]
+  name = "Supported"
+    [[arena.team.ship]]
+    schematic = "drone"
+    level = 1
+    count = 3
+    modules = [
+      {type = "laser_cannon_xs",  x = 1, y = 1, rotation = "east"},
+    ]
+
+    [[arena.team.ship]]
+    schematic = "drone"
+    level = 1
+    count = 2
+    modules = [
+      {type = "repair_tool",  x = 1, y = 1, rotation = "east"},
+    ]
 
 [[arena]]
 name = "Stations and Ships"
@@ -40,7 +79,7 @@ enemy_buffer_width_tiles = 15
     level = 1
     count = 3
     modules = [
-      {type = "laser_cannon",   x = 1, y = 1, rotation = "east"},
+      {type = "laser_cannon_xs",   x = 1, y = 1, rotation = "east"},
     ]
     [[arena.team.station]]
     type = "player_station"
@@ -60,5 +99,5 @@ enemy_buffer_width_tiles = 15
     level = 1
     count = 8
     modules = [
-      {type = "laser_cannon",  x = 1, y = 1, rotation = "east"},
+      {type = "laser_cannon_xs",  x = 1, y = 1, rotation = "east"},
     ]

bin/test/data/config/modules.toml

@@ -80,3 +80,58 @@ glyph = "Rp"
 [module.repair]
 repair_rate_hz_formula = "5 + x"
 repair_range_m_formula = "800"
+
+[[module]]
+id = "weapon_primer"
+surface_mask = ["O"]
+materials = [{item = "iron_ingot", amount = 1}]
+player_production_level = 1
+production_time_seconds = 4
+threat_cost = 1.0
+fill_color = "#FF4040"
+glyph = "Wp"
+
+[module.weapon]
+multiplied_attack_rate_hz_formula = "1.2"
+
+[[module]]
+id = "weapon_stabilizer"
+surface_mask = ["O"]
+materials = [{item = "iron_ingot", amount = 1}]
+player_production_level = 1
+production_time_seconds = 4
+threat_cost = 1.0
+fill_color = "#FF4040"
+glyph = "Ws"
+
+[module.weapon]
+multiplied_attack_range_m_formula = "1.5"
+multiplied_attack_rate_hz_formula = "0.8"
+
+[[module]]
+id = "afterburner"
+surface_mask = ["O"]
+materials = [{item = "iron_ingot", amount = 1}]
+player_production_level = 1
+production_time_seconds = 2
+threat_cost = 1.0
+fill_color = "#40A0FF"
+glyph = "Ab"
+
+[module.movement]
+multiplied_speed_mps_formula = "1.6"
+added_main_acceleration_mpss_formula = "60"
+
+[[module]]
+id = "maneuvering_thrusters"
+surface_mask = ["O"]
+materials = [{item = "iron_ingot", amount = 1}]
+player_production_level = 1
+production_time_seconds = 2
+threat_cost = 1.0
+fill_color = "#40A0FF"
+glyph = "Mt"
+
+[module.movement]
+multiplied_speed_mps_formula = "1.2"
+added_maneuvering_acceleration_mpss_formula = "10"

src/lib/config/ConfigLoader.cpp

@@ -532,6 +532,8 @@ struct StatEntry
 static const StatEntry kKnownStats[] = {
     {"health",   "hp",                        ""},
     {"movement", "speed",                     "_mps"},
+    {"movement", "main_acceleration",         "_mpss"},
+    {"movement", "maneuvering_acceleration",  "_mpss"},
     {"sensor",   "sensor_range",              "_m"},
     {"weapon",   "damage",                    ""},
     {"weapon",   "attack_range",              "_m"},
@@ -596,7 +598,7 @@ ModulesConfig ConfigLoader::loadModules(const std::string& path)
             toml::table& catMt = const_cast<toml::table&>(catTable);
 
             const std::string addedKey      = std::string("added_") + se.stat + se.addedKeySuffix + "_formula";
-            const std::string multipliedKey = std::string("multiplied_") + se.stat + "_formula";
+            const std::string multipliedKey = std::string("multiplied_") + se.stat + se.addedKeySuffix + "_formula";
 
             if (catMt.contains(addedKey))
             {

src/lib/ecs/system/ShipSystem.cpp

@@ -2,6 +2,7 @@
 
 #include <cassert>
 #include <map>
+#include <stdexcept>
 #include <utility>
 #include <vector>
 
@@ -102,7 +103,7 @@ entt::entity ShipSystem::spawn(const std::string& schematicId, int level,
     for (const PlacedModule& pm : modules)
     {
         const ModuleDef* modDef = findModuleDef(pm.moduleId);
-        if (!modDef) { continue; }
+        if (!modDef) { throw std::runtime_error("unknown module id '" + pm.moduleId + "'"); }
 
         const double mx = static_cast<double>(modDef->playerProductionLevel);
 
@@ -173,7 +174,7 @@ entt::entity ShipSystem::spawn(const std::string& schematicId, int level,
     for (const PlacedModule& pm : modules)
     {
         const ModuleDef* modDef = findModuleDef(pm.moduleId);
-        if (!modDef) { continue; }
+        if (!modDef) { throw std::runtime_error("unknown module id '" + pm.moduleId + "'"); }
 
         const double mx = static_cast<double>(modDef->playerProductionLevel);
 
@@ -211,6 +212,7 @@ entt::entity ShipSystem::spawn(const std::string& schematicId, int level,
 
     // Range stat additive modifiers are expressed in metres in config; convert to tiles.
     const double tileSizeD  = static_cast<double>(m_config.world.tileSize_m);
+    const double tickRateD  = static_cast<double>(kTickRateHz);
     const char* const kRangeStats[] = {
         "sensor_range", "attack_range", "collection_range", "repair_range"
     };
@@ -229,6 +231,23 @@ entt::entity ShipSystem::spawn(const std::string& schematicId, int level,
         }
     }
 
+    // Acceleration additive modifiers are in m/s² in config; convert to tiles/tick
+    // (same as the base spawn conversion: / tileSize / tickRate).
+    const char* const kAccelerationStats[] = {
+        "main_acceleration", "maneuvering_acceleration"
+    };
+    for (const char* stat : kAccelerationStats)
+    {
+        for (std::map<std::string, std::pair<double, double>>* mods : allModMaps)
+        {
+            std::map<std::string, std::pair<double, double>>::iterator it = mods->find(stat);
+            if (it != mods->end())
+            {
+                it->second.second /= tileSizeD * tickRateD;
+            }
+        }
+    }
+
     // Helper: apply a modifier map to a float stat.
     auto applyMod = [](float& stat, const std::string& name,
                        const std::map<std::string, std::pair<double, double>>& mods)

src/lib/sim/ShipStatsCalculator.cpp

@@ -1,6 +1,7 @@
 #include "ShipStatsCalculator.h"
 
 #include <map>
+#include <stdexcept>
 #include <utility>
 
 #include "DynamicBodyComponent.h"
@@ -67,7 +68,7 @@ ShipStats calculateShipStats(const GameConfig& config,
     for (const PlacedModule& pm : modules)
     {
         const ModuleDef* def = findModuleDef(pm.moduleId);
-        if (!def) { continue; }
+        if (!def) { throw std::runtime_error("unknown module id '" + pm.moduleId + "'"); }
 
         const double mx = static_cast<double>(def->playerProductionLevel);
 
@@ -105,7 +106,7 @@ ShipStats calculateShipStats(const GameConfig& config,
     for (const PlacedModule& pm : modules)
     {
         const ModuleDef* def = findModuleDef(pm.moduleId);
-        if (!def) { continue; }
+        if (!def) { throw std::runtime_error("unknown module id '" + pm.moduleId + "'"); }
 
         const double mx = static_cast<double>(def->playerProductionLevel);
 
@@ -157,6 +158,22 @@ ShipStats calculateShipStats(const GameConfig& config,
         }
     }
 
+    // Acceleration additive modifiers are in m/s² in config; convert to tiles/s².
+    const char* const kAccelerationStats[] = {
+        "main_acceleration", "maneuvering_acceleration"
+    };
+    for (const char* stat : kAccelerationStats)
+    {
+        for (std::map<std::string, std::pair<double, double>>* mods : allModMaps)
+        {
+            std::map<std::string, std::pair<double, double>>::iterator it = mods->find(stat);
+            if (it != mods->end())
+            {
+                it->second.second /= tileSize;
+            }
+        }
+    }
+
     auto applyMod = [](float& stat, const std::string& name,
                        const std::map<std::string, std::pair<double, double>>& mods)
     {

src/test/ModuleConfigTest.cpp

@@ -8,6 +8,24 @@ static GameConfig loadConfig()
     return ConfigLoader::loadFromDirectory(CONFIG_DIR);
 }
 
+static const ModuleDef* findModule(const GameConfig& cfg, const std::string& id)
+{
+    for (const ModuleDef& m : cfg.modules.modules)
+    {
+        if (m.id == id) { return &m; }
+    }
+    return nullptr;
+}
+
+static const ModuleStatModifier* findModifier(const ModuleDef& def, const std::string& stat)
+{
+    for (const ModuleStatModifier& sm : def.statModifiers)
+    {
+        if (sm.stat == stat) { return &sm; }
+    }
+    return nullptr;
+}
+
 TEST_CASE("ConfigLoader: loadModules parses modules.toml", "[config][modules]")
 {
     const GameConfig cfg = loadConfig();
@@ -44,6 +62,72 @@ TEST_CASE("ConfigLoader: loadModules parses additive modifiers", "[config][modul
     CHECK(sensor.statModifiers[0].formula.evaluate(1.0) == Approx(100.0));
 }
 
+TEST_CASE("ConfigLoader: multiplicative modifier with unit suffix is parsed (weapon_primer)", "[config][modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ModuleDef* primer = findModule(cfg, "weapon_primer");
+    REQUIRE(primer != nullptr);
+    REQUIRE(primer->statModifiers.size() == 1);
+    const ModuleStatModifier* sm = findModifier(*primer, "attack_rate");
+    REQUIRE(sm != nullptr);
+    CHECK(sm->modifierType == "multiplicative");
+    CHECK(sm->formula.evaluate(1.0) == Approx(1.2));
+}
+
+TEST_CASE("ConfigLoader: weapon_stabilizer parses two multiplicative weapon modifiers", "[config][modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ModuleDef* stab = findModule(cfg, "weapon_stabilizer");
+    REQUIRE(stab != nullptr);
+    REQUIRE(stab->statModifiers.size() == 2);
+
+    const ModuleStatModifier* rangeMod = findModifier(*stab, "attack_range");
+    REQUIRE(rangeMod != nullptr);
+    CHECK(rangeMod->modifierType == "multiplicative");
+    CHECK(rangeMod->formula.evaluate(1.0) == Approx(1.5));
+
+    const ModuleStatModifier* rateMod = findModifier(*stab, "attack_rate");
+    REQUIRE(rateMod != nullptr);
+    CHECK(rateMod->modifierType == "multiplicative");
+    CHECK(rateMod->formula.evaluate(1.0) == Approx(0.8));
+}
+
+TEST_CASE("ConfigLoader: afterburner parses multiplicative speed and additive main_acceleration", "[config][modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ModuleDef* ab = findModule(cfg, "afterburner");
+    REQUIRE(ab != nullptr);
+    REQUIRE(ab->statModifiers.size() == 2);
+
+    const ModuleStatModifier* speedMod = findModifier(*ab, "speed");
+    REQUIRE(speedMod != nullptr);
+    CHECK(speedMod->modifierType == "multiplicative");
+    CHECK(speedMod->formula.evaluate(1.0) == Approx(1.6));
+
+    const ModuleStatModifier* accelMod = findModifier(*ab, "main_acceleration");
+    REQUIRE(accelMod != nullptr);
+    CHECK(accelMod->modifierType == "additive");
+    CHECK(accelMod->formula.evaluate(1.0) == Approx(60.0));
+}
+
+TEST_CASE("ConfigLoader: maneuvering_thrusters parses multiplicative speed and additive maneuvering_acceleration", "[config][modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ModuleDef* mt = findModule(cfg, "maneuvering_thrusters");
+    REQUIRE(mt != nullptr);
+    REQUIRE(mt->statModifiers.size() == 2);
+
+    const ModuleStatModifier* speedMod = findModifier(*mt, "speed");
+    REQUIRE(speedMod != nullptr);
+    CHECK(speedMod->modifierType == "multiplicative");
+    CHECK(speedMod->formula.evaluate(1.0) == Approx(1.2));
+
+    const ModuleStatModifier* accelMod = findModifier(*mt, "maneuvering_acceleration");
+    REQUIRE(accelMod != nullptr);
+    CHECK(accelMod->modifierType == "additive");
+    CHECK(accelMod->formula.evaluate(1.0) == Approx(10.0));
+}
+
 TEST_CASE("ConfigLoader: loadShips parses layout field", "[config][ships]")
 {
     const GameConfig cfg = loadConfig();

src/test/ShipModuleTest.cpp

@@ -4,17 +4,21 @@
 #include "BuildingSystem.h"
 #include "BuildingType.h"
 #include "ConfigLoader.h"
+#include "DynamicBodyComponent.h"
 #include "EntityAdmin.h"
 #include "GameConfig.h"
 #include "HealthComponent.h"
 #include "ItemType.h"
+#include "ModuleOwnerComponent.h"
 #include "ModulesConfig.h"
 #include "Rotation.h"
 #include "SensorRangeComponent.h"
 #include "ShipLayout.h"
+#include "ShipStatsCalculator.h"
 #include "ShipSystem.h"
 #include "Simulation.h"
 #include "Tick.h"
+#include "WeaponComponent.h"
 
 static GameConfig loadConfig()
 {
@@ -33,6 +37,17 @@ static const ShipDef* findSchematic(const GameConfig& cfg, const std::string& id
     return nullptr;
 }
 
+static entt::entity findFirstWeaponChild(EntityAdmin& admin, entt::entity ship)
+{
+    entt::entity result = entt::null;
+    admin.forEach<WeaponComponent, ModuleOwnerComponent>(
+        [&](entt::entity ce, const WeaponComponent&, const ModuleOwnerComponent& o)
+        {
+            if (o.owner == ship && result == entt::null) { result = ce; }
+        });
+    return result;
+}
+
 static const BuildingDef* findShipyardDef(const GameConfig& cfg)
 {
     for (const BuildingDef& def : cfg.buildings.buildings)
@@ -283,3 +298,219 @@ TEST_CASE("Shipyard: setRecipe clears ship layout", "[modules][shipyard]")
     REQUIRE(b2 != nullptr);
     CHECK_FALSE(b2->shipLayout.has_value());
 }
+
+// ---------------------------------------------------------------------------
+// Weapon modifier simulation tests
+// ---------------------------------------------------------------------------
+
+TEST_CASE("Ship spawn: weapon_primer multiplies attack rate in simulation", "[modules]")
+{
+    Simulation sim(loadConfig(), 42);
+    const ShipDef* def = findSchematic(sim.config(), "interceptor");
+    REQUIRE(def != nullptr);
+
+    ShipLayoutConfig layout;
+    for (const std::string& id : {"laser_cannon", "weapon_primer"})
+    {
+        PlacedModule pm;
+        pm.moduleId = id;
+        pm.position = QPoint(0, 0);
+        pm.rotation = Rotation::East;
+        layout.placedModules.push_back(pm);
+    }
+
+    const entt::entity ship = sim.ships().spawn("interceptor",
+        def->schematic.playerProductionLevel,
+        QVector2D(5.0f, 5.0f), false, layout);
+
+    const entt::entity weapon = findFirstWeaponChild(sim.admin(), ship);
+    REQUIRE(sim.admin().isValid(weapon));
+    // base rate = 2.0 hz; weapon_primer multiplier = 1.2 → 2.4 hz
+    CHECK(sim.admin().get<WeaponComponent>(weapon).fireRateHz == Approx(2.4f));
+}
+
+TEST_CASE("Ship spawn: weapon_stabilizer multiplies attack range in simulation", "[modules]")
+{
+    Simulation sim(loadConfig(), 42);
+    const ShipDef* def = findSchematic(sim.config(), "interceptor");
+    REQUIRE(def != nullptr);
+
+    const float tileSize = static_cast<float>(sim.config().world.tileSize_m);
+
+    ShipLayoutConfig layout;
+    for (const std::string& id : {"laser_cannon", "weapon_stabilizer"})
+    {
+        PlacedModule pm;
+        pm.moduleId = id;
+        pm.position = QPoint(0, 0);
+        pm.rotation = Rotation::East;
+        layout.placedModules.push_back(pm);
+    }
+
+    const entt::entity ship = sim.ships().spawn("interceptor",
+        def->schematic.playerProductionLevel,
+        QVector2D(5.0f, 5.0f), false, layout);
+
+    const entt::entity weapon = findFirstWeaponChild(sim.admin(), ship);
+    REQUIRE(sim.admin().isValid(weapon));
+    // base range = 50 m / tileSize = 5 tiles; weapon_stabilizer multiplier = 1.5 → 7.5 tiles
+    CHECK(sim.admin().get<WeaponComponent>(weapon).range_tiles == Approx(50.0f / tileSize * 1.5f));
+}
+
+TEST_CASE("Ship spawn: afterburner additive main_acceleration is converted m/s² to tiles/tick", "[modules]")
+{
+    Simulation sim(loadConfig(), 42);
+    const ShipDef* def = findSchematic(sim.config(), "interceptor");
+    REQUIRE(def != nullptr);
+
+    const double x         = static_cast<double>(def->schematic.playerProductionLevel);
+    const float tileSize   = static_cast<float>(sim.config().world.tileSize_m);
+    const float tickRate   = static_cast<float>(kTickRateHz);
+    const float base_mpss  = static_cast<float>(def->movement.mainAccelerationFormula.evaluate(x));
+
+    ShipLayoutConfig layout;
+    PlacedModule pm;
+    pm.moduleId = "afterburner";
+    pm.position = QPoint(0, 0);
+    pm.rotation = Rotation::East;
+    layout.placedModules.push_back(pm);
+
+    const entt::entity e = sim.ships().spawn("interceptor",
+        def->schematic.playerProductionLevel,
+        QVector2D(5.0f, 5.0f), false, layout);
+
+    // added_main_acceleration_mpss = 60; same conversion as base: / tileSize / tickRate
+    const float expected = (base_mpss + 60.0f) / tileSize / tickRate;
+    CHECK(sim.admin().get<DynamicBodyComponent>(e).mainAcceleration_tptt == Approx(expected));
+}
+
+TEST_CASE("Ship spawn: maneuvering_thrusters additive maneuvering_acceleration is converted m/s² to tiles/tick", "[modules]")
+{
+    Simulation sim(loadConfig(), 42);
+    const ShipDef* def = findSchematic(sim.config(), "interceptor");
+    REQUIRE(def != nullptr);
+
+    const double x         = static_cast<double>(def->schematic.playerProductionLevel);
+    const float tileSize   = static_cast<float>(sim.config().world.tileSize_m);
+    const float tickRate   = static_cast<float>(kTickRateHz);
+    const float base_mpss  = static_cast<float>(def->movement.maneuveringAccelerationFormula.evaluate(x));
+
+    ShipLayoutConfig layout;
+    PlacedModule pm;
+    pm.moduleId = "maneuvering_thrusters";
+    pm.position = QPoint(0, 0);
+    pm.rotation = Rotation::East;
+    layout.placedModules.push_back(pm);
+
+    const entt::entity e = sim.ships().spawn("interceptor",
+        def->schematic.playerProductionLevel,
+        QVector2D(5.0f, 5.0f), false, layout);
+
+    // added_maneuvering_acceleration_mpss = 10; same conversion as base: / tileSize / tickRate
+    const float expected = (base_mpss + 10.0f) / tileSize / tickRate;
+    CHECK(sim.admin().get<DynamicBodyComponent>(e).maneuveringAcceleration_tptt == Approx(expected));
+}
+
+// ---------------------------------------------------------------------------
+// Weapon modifier stats view tests (calculateShipStats)
+// ---------------------------------------------------------------------------
+
+TEST_CASE("calculateShipStats: weapon_primer multiplies attack rate in stats view", "[modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ShipDef* def = findSchematic(cfg, "interceptor");
+    REQUIRE(def != nullptr);
+
+    std::vector<PlacedModule> modules;
+    for (const std::string& id : {"laser_cannon", "weapon_primer"})
+    {
+        PlacedModule pm;
+        pm.moduleId = id;
+        pm.position = QPoint(0, 0);
+        pm.rotation = Rotation::East;
+        modules.push_back(pm);
+    }
+
+    const ShipStats stats = calculateShipStats(cfg, "interceptor",
+        def->schematic.playerProductionLevel, modules);
+
+    REQUIRE(stats.weapons.has_value());
+    // base: damage = 2, rate = 2.0 hz; weapon_primer multiplies rate by 1.2 → DPS = 2 * 2.4 = 4.8
+    CHECK(stats.weapons->combinedDps == Approx(4.8f));
+}
+
+TEST_CASE("calculateShipStats: weapon_stabilizer multiplies attack range in stats view", "[modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ShipDef* def = findSchematic(cfg, "interceptor");
+    REQUIRE(def != nullptr);
+
+    const float tileSize = static_cast<float>(cfg.world.tileSize_m);
+
+    std::vector<PlacedModule> modules;
+    for (const std::string& id : {"laser_cannon", "weapon_stabilizer"})
+    {
+        PlacedModule pm;
+        pm.moduleId = id;
+        pm.position = QPoint(0, 0);
+        pm.rotation = Rotation::East;
+        modules.push_back(pm);
+    }
+
+    const ShipStats stats = calculateShipStats(cfg, "interceptor",
+        def->schematic.playerProductionLevel, modules);
+
+    REQUIRE(stats.weapons.has_value());
+    // base range = 50 m / tileSize; weapon_stabilizer multiplier = 1.5
+    CHECK(stats.weapons->maxRange_tiles == Approx(50.0f / tileSize * 1.5f));
+}
+
+TEST_CASE("calculateShipStats: afterburner additive main_acceleration is converted m/s² to tiles/s²", "[modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ShipDef* def = findSchematic(cfg, "interceptor");
+    REQUIRE(def != nullptr);
+
+    const double x        = static_cast<double>(def->schematic.playerProductionLevel);
+    const float tileSize  = static_cast<float>(cfg.world.tileSize_m);
+    const float base_mpss = static_cast<float>(def->movement.mainAccelerationFormula.evaluate(x));
+
+    std::vector<PlacedModule> modules;
+    PlacedModule pm;
+    pm.moduleId = "afterburner";
+    pm.position = QPoint(0, 0);
+    pm.rotation = Rotation::East;
+    modules.push_back(pm);
+
+    const ShipStats stats = calculateShipStats(cfg, "interceptor",
+        def->schematic.playerProductionLevel, modules);
+
+    // added_main_acceleration_mpss = 60; converted to tiles/s²: / tileSize
+    const float expected = (base_mpss + 60.0f) / tileSize;
+    CHECK(stats.mainAcceleration_tpss == Approx(expected));
+}
+
+TEST_CASE("calculateShipStats: maneuvering_thrusters additive maneuvering_acceleration is converted m/s² to tiles/s²", "[modules]")
+{
+    const GameConfig cfg = loadConfig();
+    const ShipDef* def = findSchematic(cfg, "interceptor");
+    REQUIRE(def != nullptr);
+
+    const double x        = static_cast<double>(def->schematic.playerProductionLevel);
+    const float tileSize  = static_cast<float>(cfg.world.tileSize_m);
+    const float base_mpss = static_cast<float>(def->movement.maneuveringAccelerationFormula.evaluate(x));
+
+    std::vector<PlacedModule> modules;
+    PlacedModule pm;
+    pm.moduleId = "maneuvering_thrusters";
+    pm.position = QPoint(0, 0);
+    pm.rotation = Rotation::East;
+    modules.push_back(pm);
+
+    const ShipStats stats = calculateShipStats(cfg, "interceptor",
+        def->schematic.playerProductionLevel, modules);
+
+    // added_maneuvering_acceleration_mpss = 10; converted to tiles/s²: / tileSize
+    const float expected = (base_mpss + 10.0f) / tileSize;
+    CHECK(stats.maneuveringAcceleration_tpss == Approx(expected));
+}