diff --git a/.gitignore b/.gitignore
index 12ca21bf90..fdf2b4f464 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,8 +14,10 @@
 /core/assets-raw/sprites/generated/
 /annotations/build/
 /kryonet/build/
-/packer/build/
+/tools/build/
+/tests/build/
 /server/build/
+/test_files/
 /annotations/build/
 /android/assets/mindustry-maps/
 /android/assets/mindustry-saves/
diff --git a/build.gradle b/build.gradle
index df4df532dc..9954ae113d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ allprojects {
         appName = 'Mindustry'
         gdxVersion = '1.9.8'
         roboVMVersion = '2.3.0'
-        uCoreVersion = '00d05bd7d3e943c8a454ccf2cb69cdffb23afbb7'
+        uCoreVersion = '220916714cbe63664c34f95a9dc50a362feca732'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
@@ -119,20 +119,6 @@ project(":html") {
     }
 }
 
-project(":tests"){
-    apply plugin: "java"
-
-    dependencies {
-        compile project(":core")
-        testImplementation('org.junit.jupiter:junit-jupiter-api:5.1.0')
-        testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.1.0')
-    }
-
-    test {
-        useJUnitPlatform()
-    }
-}
-
 project(":ios") {
     apply plugin: "java"
     apply plugin: "robovm"
@@ -218,6 +204,23 @@ project(":server") {
     }
 }
 
+project(":tests"){
+    apply plugin: "java"
+
+    dependencies {
+        testImplementation project(":core")
+        testImplementation('org.junit.jupiter:junit-jupiter-api:5.1.0')
+        testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.1.0')
+        testImplementation "com.badlogicgames.gdx:gdx-backend-headless:$gdxVersion"
+        testImplementation "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop"
+    }
+
+    test {
+        useJUnitPlatform()
+        workingDir = new File("../core/assets")
+    }
+}
+
 project(":tools") {
     apply plugin: "java"
 
diff --git a/core/assets-raw/sprites/blocks/units/revenant-factory.png b/core/assets-raw/sprites/blocks/units/revenant-factory.png
index 6182b7ea09..a236936f62 100644
Binary files a/core/assets-raw/sprites/blocks/units/revenant-factory.png and b/core/assets-raw/sprites/blocks/units/revenant-factory.png differ
diff --git a/core/assets/sprites/sprites.png b/core/assets/sprites/sprites.png
index c81d3af0bd..e84fb5e1c2 100644
Binary files a/core/assets/sprites/sprites.png and b/core/assets/sprites/sprites.png differ
diff --git a/core/src/io/anuke/mindustry/maps/Sector.java b/core/src/io/anuke/mindustry/maps/Sector.java
index 7c363f7164..89f4a487fa 100644
--- a/core/src/io/anuke/mindustry/maps/Sector.java
+++ b/core/src/io/anuke/mindustry/maps/Sector.java
@@ -11,6 +11,7 @@ import io.anuke.mindustry.type.ItemStack;
 import io.anuke.ucore.util.Bits;
 
 import static io.anuke.mindustry.Vars.control;
+import static io.anuke.mindustry.Vars.headless;
 
 @Serialize
 public class Sector{
@@ -46,11 +47,11 @@ public class Sector{
     }
 
     public SaveSlot getSave(){
-        return control.getSaves().getByID(saveID);
+        return !hasSave() ? null : control.getSaves().getByID(saveID);
     }
 
     public boolean hasSave(){
-        return control.getSaves().getByID(saveID) != null;
+        return !headless && control.getSaves().getByID(saveID) != null;
     }
 
     public int packedPosition(){
diff --git a/core/src/io/anuke/mindustry/maps/Sectors.java b/core/src/io/anuke/mindustry/maps/Sectors.java
index 11a48a92c9..3b629b379e 100644
--- a/core/src/io/anuke/mindustry/maps/Sectors.java
+++ b/core/src/io/anuke/mindustry/maps/Sectors.java
@@ -47,7 +47,9 @@ public class Sectors{
             }
             world.loadSector(sector);
             logic.play();
-            sector.saveID = control.getSaves().addSave("sector-" + sector.packedPosition()).index;
+            if(!headless){
+                sector.saveID = control.getSaves().addSave("sector-" + sector.packedPosition()).index;
+            }
             world.sectors().save();
             world.setSector(sector);
             sector.currentMission().onBegin();
diff --git a/core/src/io/anuke/mindustry/net/Administration.java b/core/src/io/anuke/mindustry/net/Administration.java
index b303bf4d2a..e8ca496d2f 100644
--- a/core/src/io/anuke/mindustry/net/Administration.java
+++ b/core/src/io/anuke/mindustry/net/Administration.java
@@ -1,7 +1,6 @@
 package io.anuke.mindustry.net;
 
 import com.badlogic.gdx.utils.Array;
-import com.badlogic.gdx.utils.IntMap;
 import com.badlogic.gdx.utils.ObjectMap;
 import io.anuke.annotations.Annotations.Serialize;
 import io.anuke.ucore.core.Settings;
@@ -16,8 +15,6 @@ public class Administration{
     private ObjectMap<String, PlayerInfo> playerInfo = new ObjectMap<>();
     /**Maps UUIDs to trace infos. This is wiped when a player logs off.*/
     private ObjectMap<String, TraceInfo> traceInfo = new ObjectMap<>();
-    /** Maps packed coordinates to logs for that coordinate*/
-    private IntMap<Array<EditLog>> editLogs = new IntMap<>();
     private Array<String> bannedIPs = new Array<>();
 
     public Administration(){
@@ -46,16 +43,6 @@ public class Administration{
         Settings.save();
     }
 
-    public void setAntiGriefParams(int maxBreak, int cooldown){
-        Settings.putInt("antigrief-max", maxBreak);
-        Settings.putInt("antigrief-cooldown", cooldown);
-        Settings.save();
-    }
-
-    public IntMap<Array<EditLog>> getEditLogs(){
-        return editLogs;
-    }
-
     /**
      * Call when a player joins to update their information here.
      */
diff --git a/core/src/io/anuke/mindustry/net/EditLog.java b/core/src/io/anuke/mindustry/net/EditLog.java
deleted file mode 100644
index ab922ae8e0..0000000000
--- a/core/src/io/anuke/mindustry/net/EditLog.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package io.anuke.mindustry.net;
-
-import io.anuke.mindustry.world.Block;
-
-public class EditLog{
-    public String playername;
-    public Block block;
-    public int rotation;
-    public EditAction action;
-
-    EditLog(String playername, Block block, int rotation, EditAction action){
-        this.playername = playername;
-        this.block = block;
-        this.rotation = rotation;
-        this.action = action;
-    }
-
-    public enum EditAction{
-        PLACE, BREAK
-    }
-}
diff --git a/server/src/io/anuke/mindustry/server/ServerLauncher.java b/server/src/io/anuke/mindustry/server/ServerLauncher.java
index 3ed3280250..17ce9d6a8d 100644
--- a/server/src/io/anuke/mindustry/server/ServerLauncher.java
+++ b/server/src/io/anuke/mindustry/server/ServerLauncher.java
@@ -1,7 +1,6 @@
 package io.anuke.mindustry.server;
 
 import com.badlogic.gdx.ApplicationListener;
-import com.badlogic.gdx.ApplicationLogger;
 import com.badlogic.gdx.Files.FileType;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Preferences;
@@ -13,6 +12,7 @@ import io.anuke.kryonet.KryoClient;
 import io.anuke.kryonet.KryoServer;
 import io.anuke.mindustry.net.Net;
 import io.anuke.ucore.io.BinaryPreferences;
+import io.anuke.ucore.util.EmptyLogger;
 import io.anuke.ucore.util.OS;
 
 import java.io.File;
@@ -24,31 +24,7 @@ public class ServerLauncher extends HeadlessApplication{
         super(listener, config);
 
         //don't do anything at all for GDX logging: don't want controller info and such
-        Gdx.app.setApplicationLogger(new ApplicationLogger(){
-            @Override
-            public void log(String tag, String message){
-            }
-
-            @Override
-            public void log(String tag, String message, Throwable exception){
-            }
-
-            @Override
-            public void error(String tag, String message){
-            }
-
-            @Override
-            public void error(String tag, String message, Throwable exception){
-            }
-
-            @Override
-            public void debug(String tag, String message){
-            }
-
-            @Override
-            public void debug(String tag, String message, Throwable exception){
-            }
-        });
+        Gdx.app.setApplicationLogger(new EmptyLogger());
     }
 
     public static void main(String[] args){
diff --git a/tests/src/test/java/ApplicationTests.java b/tests/src/test/java/ApplicationTests.java
new file mode 100644
index 0000000000..5cee8a0c0a
--- /dev/null
+++ b/tests/src/test/java/ApplicationTests.java
@@ -0,0 +1,204 @@
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.backends.headless.HeadlessApplication;
+import com.badlogic.gdx.backends.headless.HeadlessApplicationConfiguration;
+import io.anuke.mindustry.Vars;
+import io.anuke.mindustry.content.Items;
+import io.anuke.mindustry.content.blocks.Blocks;
+import io.anuke.mindustry.content.blocks.StorageBlocks;
+import io.anuke.mindustry.core.GameState.State;
+import io.anuke.mindustry.core.Logic;
+import io.anuke.mindustry.core.NetServer;
+import io.anuke.mindustry.core.World;
+import io.anuke.mindustry.game.Content;
+import io.anuke.mindustry.game.Team;
+import io.anuke.mindustry.io.BundleLoader;
+import io.anuke.mindustry.io.SaveIO;
+import io.anuke.mindustry.maps.Map;
+import io.anuke.mindustry.world.Tile;
+import io.anuke.ucore.core.Timers;
+import io.anuke.ucore.modules.ModuleCore;
+import io.anuke.ucore.util.EmptyLogger;
+import io.anuke.ucore.util.Log;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+
+import static io.anuke.mindustry.Vars.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ApplicationTests{
+
+    @BeforeAll
+    static void launchApplication(){
+        try{
+            boolean[] begins = {false};
+            Throwable[] exceptionThrown = {null};
+            Log.setUseColors(false);
+
+            ModuleCore core = new ModuleCore(){
+                @Override
+                public void init(){
+                    Vars.init();
+
+                    headless = true;
+
+                    BundleLoader.load();
+                    content.load();
+                    content.initialize(Content::init);
+
+                    module(logic = new Logic());
+                    module(world = new World());
+                    module(netServer = new NetServer());
+                }
+
+                @Override
+                public void postInit(){
+                    super.postInit();
+                    begins[0] = true;
+                }
+            };
+
+            HeadlessApplicationConfiguration config = new HeadlessApplicationConfiguration();
+            config.preferencesDirectory = "test_files/";
+
+            new File("tests_files/").delete();
+
+            new HeadlessApplication(core, config){{
+                Gdx.app.setApplicationLogger(new EmptyLogger());
+            }};
+
+            for(Thread thread : Thread.getAllStackTraces().keySet()){
+                if(thread.getName().equals("HeadlessApplication")){
+                    thread.setUncaughtExceptionHandler((t, throwable) -> exceptionThrown[0] = throwable);
+                    break;
+                }
+            }
+
+            while(!begins[0]){
+                if(exceptionThrown[0] != null){
+                    fail(exceptionThrown[0]);
+                }
+                Thread.sleep(10);
+            }
+        }catch(Throwable r){
+            fail(r);
+        }
+    }
+
+    @BeforeEach
+    void resetWorld(){
+        Timers.setDeltaProvider(() ->  1f);
+        logic.reset();
+        state.set(State.menu);
+    }
+
+    @Test
+    void initialization(){
+        assertTrue(logic != null);
+        assertTrue(world != null);
+        assertTrue(content.getContentMap().length > 0);
+    }
+
+    @Test
+    void loadSector(){
+        world.sectors().createSector(0, 0);
+        world.sectors().playSector(world.sectors().get(0, 0));
+    }
+
+    @Test
+    void playMap(){
+        assertTrue(world.maps().all().size > 0);
+
+        world.loadMap(world.maps().all().first());
+    }
+
+    @Test
+    void spawnWaves(){
+        world.loadMap(world.maps().all().first());
+        logic.runWave();
+        unitGroups[waveTeam.ordinal()].updateEvents();
+        assertFalse(unitGroups[waveTeam.ordinal()].isEmpty());
+    }
+
+    @Test
+    void createMap(){
+        assertTrue(world.maps().all().size > 0);
+
+        Tile[][] tiles = world.createTiles(8, 8);
+
+        world.beginMapLoad();
+        for(int x = 0; x < tiles.length; x++){
+            for(int y = 0; y < tiles[0].length; y++){
+                tiles[x][y] = new Tile(x, y, (byte)0, (byte)0);
+            }
+        }
+        world.endMapLoad();
+    }
+
+    @Test
+    void multiblock(){
+        createMap();
+        int bx = 4;
+        int by = 4;
+        world.setBlock(world.tile(bx, by), StorageBlocks.core, Team.blue);
+        assertTrue(world.tile(bx, by).getTeam() == Team.blue);
+        for(int x = bx-1; x <= bx + 1; x++){
+            for(int y = by-1; y <= by + 1; y++){
+                if(x == bx && by == y){
+                    assertTrue(world.tile(x, y).block() == StorageBlocks.core);
+                }else{
+                    assertTrue(world.tile(x, y).block() == Blocks.blockpart && world.tile(x, y).getLinked() == world.tile(bx, by));
+                }
+            }
+        }
+    }
+
+    @Test
+    void blockInventories(){
+        multiblock();
+        Tile tile = world.tile(4, 4);
+        tile.entity.items.add(Items.coal, 5);
+        tile.entity.items.add(Items.titanium, 50);
+        assertTrue(tile.entity.items.total() == 55);
+        tile.entity.items.remove(Items.phasematter, 10);
+        tile.entity.items.remove(Items.titanium, 10);
+        assertTrue(tile.entity.items.total() == 45);
+    }
+
+    @Test
+    void timers(){
+        boolean[] ran = {false};
+        Timers.run(1.9999f, () -> ran[0] = true);
+
+        Timers.update();
+        assertFalse(ran[0]);
+        Timers.update();
+        assertTrue(ran[0]);
+    }
+
+    @Test
+    void save(){
+        assertTrue(world.maps().all().size > 0);
+
+        world.loadMap(world.maps().all().first());
+        SaveIO.saveToSlot(0);
+    }
+
+    @Test
+    void load(){
+        assertTrue(world.maps().all().size > 0);
+
+        world.loadMap(world.maps().all().first());
+        Map map = world.getMap();
+
+        SaveIO.saveToSlot(0);
+        resetWorld();
+        SaveIO.loadFromSlot(0);
+
+        assertTrue(world.getMap() == map);
+        assertTrue(world.width() == map.meta.width);
+        assertTrue(world.height() == map.meta.height);
+    }
+}
\ No newline at end of file
diff --git a/tests/src/test/java/Tests.java b/tests/src/test/java/Tests.java
deleted file mode 100644
index 261bc16c5f..0000000000
--- a/tests/src/test/java/Tests.java
+++ /dev/null
@@ -1,9 +0,0 @@
-import org.junit.jupiter.api.BeforeEach;
-
-public class Tests{
-
-    @BeforeEach
-    void launchApplication(){
-
-    }
-}
\ No newline at end of file