Added some unit testing

javaecs/src/main/java/nz/ac/massey/programming_project_159333_s1_2021/ECS.java

@@ -135,4 +135,7 @@ public class ECS {
     void setSystemSignature(Type system, BitSet signature){
         systemManager.setSignature(system, signature);
     }
+    Integer getMaxEntities(){
+        return entityManager.currentSize;
+    }
 }

javaecs/src/main/java/nz/ac/massey/programming_project_159333_s1_2021/EntityManager.java

@@ -81,7 +81,7 @@ class EntityManager{
     }
 
     public boolean resize(int newSize, SystemManager systemManager, ComponentManager componentManager){
-        if (newSize >= currentSize - unusedEntities.size()){
+        if (newSize < currentSize - unusedEntities.size()){
             System.err.println("Attempted to resize the maximum entity count to a number smaller than the current assigned entity count.");
             return false;
         }
@@ -113,7 +113,7 @@ class EntityManager{
                 }
                 for (int i = newSize; i < currentSize; i++) {
                     // Remove out-of-bounds data
-                    entityRegistrations.remove(i);
+                    entityRegistrations.remove(newSize);
                 }
             }
             else{

javaecs/src/test/java/nz/ac/massey/programming_project_159333_s1_2021/AppTest.java

@@ -3,16 +3,155 @@ package nz.ac.massey.programming_project_159333_s1_2021;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import java.util.BitSet;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 
 /**
  * Unit test for simple App.
  */
 class AppTest {
+
+    ECS gameEngine;
+    TestSystem system;
+
+    class TestObject{
+        int i = 1;
+    }
+
+    class TestSystem extends ECSSystem{
+        public void init(){}
+        public void update() {
+            for (Integer entity : entities) {
+                TestObject entityComponent = (TestObject)gameEngine.getComponentData(entity, TestObject.class);
+                entityComponent.i++;
+            }
+        }
+    }
     /**
-     * Rigorous Test.
+     * Test assigning an entity
      */
     @Test
-    void testApp() {
-        assertEquals(1, 1);
+    void testAssignOne() {
+        int entity = gameEngine.createEntity();
+        gameEngine.addComponent(entity, TestObject.class, new TestObject());
+        assertEquals(1, ((TestObject)gameEngine.getComponentData(entity, TestObject.class)).i);
+    }
+
+    /**
+     * Test assigning the maximum number of entities
+     */
+    @Test
+    void testAssignMax(){
+        for (int i = 0; i < gameEngine.getMaxEntities(); i++) {
+            int entity = gameEngine.createEntity();
+            gameEngine.addComponent(entity, TestObject.class, new TestObject());
+            assertEquals(1, ((TestObject)gameEngine.getComponentData(entity, TestObject.class)).i);
+        }
+    }
+    /**
+     * Test assigning more than the maximum number of entities
+     */
+    @Test
+    void testAssignMoreThanMax(){
+        for (int i = 0; i < gameEngine.getMaxEntities() + 5; i++) {
+            int entity = gameEngine.createEntity();
+            gameEngine.addComponent(entity, TestObject.class, new TestObject());
+        }
+    }
+
+    /**
+     * Test removing data
+     */
+    @Test
+    void testRemoveOne(){
+        int entity = gameEngine.createEntity();
+        gameEngine.addComponent(entity, TestObject.class, new TestObject());
+        gameEngine.destroyEntity(entity);
+        assertNull(((TestObject)gameEngine.getComponentData(entity, TestObject.class)));
+    }
+
+    /**
+     * Test running the system several times
+     */
+    @Test
+    void testRunSystem(){
+        int entity = gameEngine.createEntity();
+        gameEngine.addComponent(entity, TestObject.class, new TestObject());
+
+        for (int i = 0; i < 5; i++) {
+            system.update();
+        }
+
+        assertEquals(6, ((TestObject)gameEngine.getComponentData(entity, TestObject.class)).i);
+    }
+
+
+    /**
+     * Test resizing (minimal, with only 1 entity)
+     */
+    @Test
+    void testResizeMinimal(){
+        int entity = gameEngine.createEntity();
+        gameEngine.addComponent(entity, TestObject.class, new TestObject());
+
+        gameEngine.resizeMaximum(10);
+
+        assertEquals(10, gameEngine.getMaxEntities());
+    }
+
+    /**
+     * Test large creations & deletions
+     */
+    @Test
+    void testLargeCreateDelete(){
+        for (int i = 0; i < gameEngine.getMaxEntities(); i++) {
+            int entity = gameEngine.createEntity();
+            gameEngine.addComponent(entity, TestObject.class, new TestObject());
+            assertEquals(1, ((TestObject)gameEngine.getComponentData(entity, TestObject.class)).i);
+        }
+        for (int i = 256; i < 512; i++) {
+            gameEngine.destroyEntity(i);
+        }
+    }
+
+    /**
+     * Test large creations & deletions & smaller resize
+     */
+    @Test
+    void testLargeCreateDeleteResize(){
+        for (int i = 0; i < gameEngine.getMaxEntities(); i++) {
+            int entity = gameEngine.createEntity();
+            gameEngine.addComponent(entity, TestObject.class, new TestObject());
+            assertEquals(1, ((TestObject)gameEngine.getComponentData(entity, TestObject.class)).i);
+        }
+        for (int i = 256; i < 512; i++) {
+            gameEngine.destroyEntity(i);
+        }
+
+        gameEngine.resizeMaximum(1024 - 255);
+    }
+
+
+    /**
+     * Establish a simple ECS, with a single system and component
+     */
+    @BeforeEach
+    void testSetup(){
+        gameEngine = new ECS();
+        gameEngine.registerComponent(TestObject.class);
+
+        system = new TestSystem();
+        gameEngine.registerSystem(TestSystem.class, system);
+        {
+            BitSet signature = new BitSet();
+            signature.set(gameEngine.getComponentIndex(TestObject.class));
+            gameEngine.setSystemSignature(TestSystem.class, signature);
+        }
+
+        system.init();
     }
 }