Unit tests

tests/src/test/java/DataAssetTests.java

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+import arc.struct.*;
+import mindustry.*;
+import mindustry.ctype.*;
+import mindustry.entities.bullet.*;
+import mindustry.game.*;
+import mindustry.gen.*;
+import mindustry.mod.data.*;
+import mindustry.type.*;
+import org.junit.jupiter.api.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class DataAssetTests{
+
+    @BeforeAll
+    static void init(){
+        ApplicationTests.launchApplication(false);
+    }
+
+    @AfterEach
+    void resetAfter(){
+        Vars.logic.reset();
+    }
+
+    @BeforeEach
+    void resetBefore(){
+        Vars.logic.reset();
+    }
+
+    @Test
+    void basicItem(){
+        int totalItems = Vars.content.items().size;
+
+        loadContent(ContentType.item, "testitem", """
+        name: 'Test Item'
+        hardness: 10
+        """);
+
+        Item it = find(ContentType.item, "testitem");
+        assertNotNull(it);
+        assertEquals(10f, it.hardness, 0.001f);
+        assertEquals("Test Item", it.localizedName);
+
+        resetAfter();
+
+        assertEquals(totalItems, Vars.content.items().size, "Item content must be properly reset");
+        assertNull(find(ContentType.item, "testitem"), "Item must be properly removed from map");
+    }
+
+    @Test
+    void basicUnit(){
+
+        loadContent(ContentType.unit, "testunit", """
+        name: 'Test Unit'
+        type: tank
+        weapons: [
+            {
+                mirror: true
+                bullet: {
+                    damage: 10
+                    type: Laser
+                    length: 1000
+                }
+            }
+        ]
+        """);
+
+        UnitType it = find(ContentType.unit, "testunit");
+
+        assertNotNull(it);
+        assertTrue(it.create(Team.sharded) instanceof TankUnit);
+        assertEquals("Test Unit", it.localizedName);
+        assertEquals(2, it.weapons.size);
+        assertEquals(LaserBulletType.class, it.weapons.get(0).bullet.getClass());
+        assertEquals(1000f, ((LaserBulletType)it.weapons.get(0).bullet).length, 0.001f);
+    }
+
+    @Test
+    void noContentAddedWithError(){
+
+        loadContent(ContentType.block, "badblock", """
+        name: 'This will explode'
+        type: Bad
+        """);
+
+        assertNull(find(ContentType.block, "badblock"), "Content should not be loaded when an error occurs");
+        assertEquals(1, Vars.state.data.getContent().first().warnings.size);
+    }
+
+    @Test
+    void noNullFieldsAllowed(){
+
+        loadContent(ContentType.block, "badblock", """
+        name: 'This will explode'
+        flags: null
+        """);
+
+        assertNull(find(ContentType.block, "badblock"), "Content should not be loaded when an error occurs");
+        assertEquals(1, Vars.state.data.getContent().first().warnings.size);
+        assertTrue(Vars.state.data.getContent().first().warnings.toString().contains("null"), "Warnings must contain mention of field being null: " + Vars.state.data.getContent().first().warnings);
+    }
+
+    static <T> T find(ContentType type, String name){
+        return (T)Vars.content.getByName(type, "dp-" + name);
+    }
+
+    static void loadContent(ContentType type, String name, String data){
+        Vars.state.data.load(Seq.with(new ContentAsset(name + ".json", type, data)));
+    }
+}