Added unit tests for Java, JavaScript and JSON mods

tests/src/test/java/ModTestHAI.java

@@ -0,0 +1,39 @@
+import arc.util.*;
+import mindustry.*;
+import mindustry.gen.*;
+import mindustry.type.*;
+import org.junit.jupiter.api.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+//grabs a version-locked Heavy Armaments Industries commit and makes sure it initializes correctly
+//this mod was chosen because:
+//- it is one of the top JS mods, based on stars
+//- it contains both JS and JSON, which can be used to test compatibility of the two
+//- it can be used server-side (unlike FactoryDustry, which is a client-side texture pack that cannot be tested here)
+public class ModTestHAI extends GenericModTest{
+
+    @Test
+    public void begin(){
+        grabMod("https://github.com/Eschatologue/Heavy-Armaments-Industries/archive/d996e92dcf9a30a6acb7b3bfdfb6522dddc3804c.zip");
+        checkExistence("heavy-armaments");
+
+        UnitType type = Vars.content.units().find(u -> u.name.equals("heavy-armaments-t3A_copter"));
+        assertNotNull(type, "A mod unit must be loaded.");
+        assertTrue(type.weapons.size > 0, "A mod unit must have a weapon.");
+
+        Vars.world.loadMap(ApplicationTests.testMap);
+
+        Unit unit = type.spawn(0, 0);
+
+        //check for crash
+        unit.update();
+
+        assertTrue(unit.health > 0, "Unit must be spawned and alive.");
+        assertTrue(Groups.unit.size() > 0, "Unit must be spawned and alive.");
+
+        //just an extra sanity check
+        Log.info("Modded units: @", Vars.content.units().select(u -> u.minfo.mod != null));
+    }
+
+}