Added simple caching system.

src/test/java/ca/recrown/islandsurvivalcraft/caching/CacheTest.java

@@ -0,0 +1,63 @@
+package ca.recrown.islandsurvivalcraft.caching;
+
+import static org.junit.Assert.assertSame;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
+
+@TestInstance(Lifecycle.PER_CLASS)
+public class CacheTest {
+    Cache<Integer> integerCache;
+
+    @BeforeAll
+    public void setUp() {
+        integerCache = new Cache<>(3);
+    }
+
+    @AfterEach
+    public void cleanUp() {
+        integerCache.clearCache();
+    }
+
+    @Test
+    public void testBasicCaching() {
+        CoordinateIdentifier coordsA = new CoordinateIdentifier(3, 0);
+        CoordinateIdentifier coordsB = new CoordinateIdentifier(4, 0);
+
+        CacheValue<Integer> val = integerCache.retrieveCache(coordsA);
+        assertTrue(val.isEmpty());
+        val.setValue(0);
+        assertFalse(val.isEmpty());
+        assertSame(val, integerCache.retrieveCache(coordsA));
+
+        val = integerCache.retrieveCache(coordsB);
+        assertTrue(val.isEmpty());
+        val.setValue(1);
+        assertFalse(val.isEmpty());
+        assertSame(val, integerCache.retrieveCache(coordsB));
+    }
+
+    @Test
+    public void testUsageBasedClean() {
+        integerCache.retrieveCache(new CoordinateIdentifier(1, 0)).setValue(1);
+        integerCache.retrieveCache(new CoordinateIdentifier(2, 0)).setValue(2);
+        integerCache.retrieveCache(new CoordinateIdentifier(3, 0)).setValue(3);
+        
+        integerCache.retrieveCache(new CoordinateIdentifier(1, 0)).getValue();
+
+        integerCache.retrieveCache(new CoordinateIdentifier(4, 0)).setValue(4);
+        
+        assertEquals(1, integerCache.retrieveCache(new CoordinateIdentifier(1, 0)).getValue());
+
+        assertFalse(integerCache.retrieveCache(new CoordinateIdentifier(1, 0)).isEmpty());
+
+        integerCache.retrieveCache(new CoordinateIdentifier(5, 0)).setValue(5);
+        assertFalse(integerCache.retrieveCache(new CoordinateIdentifier(1, 0)).isEmpty());
+    }
+}

src/test/java/ca/recrown/islandsurvivalcraft/caching/CoordinateIdentifierTest.java

@@ -0,0 +1,32 @@
+package ca.recrown.islandsurvivalcraft.caching;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
+
+@TestInstance(Lifecycle.PER_CLASS)
+public class CoordinateIdentifierTest {
+    Cache<Integer> integerCache;
+
+    @BeforeAll
+    public void setUp() {
+        integerCache = new Cache<>(4);
+    }
+
+    @AfterEach
+    public void cleanUp() {
+        integerCache.clearCache();
+    }
+
+    @Test
+    public void testIdentityChecking() {
+        integerCache.retrieveCache(new CoordinateIdentifier(1, 2)).setValue(8);
+        integerCache.retrieveCache(new CoordinateIdentifier(1, 2)).setValue(4);
+
+        assertEquals(4, integerCache.retrieveCache(new CoordinateIdentifier(1, 2)).getValue());
+    }
+}