Add LRUCacheTest and MRUCacheTest (fixes #3263) (#3277)

src/main/java/com/thealgorithms/datastructures/caches/LRUCache.java

@@ -168,16 +168,4 @@ public class LRUCache<K, V> {
             this.value = value;
         }
     }
-
-    public static void main(String[] args) {
-        final LRUCache<String, Integer> cache = new LRUCache<>(2);
-        cache.put("Key1", 1);
-        cache.put("Key2", 2);
-        cache.put("Key3", 3);
-        cache.put("Key4", 4);
-        System.out.println("getValue(Key1): " + cache.get("Key1"));
-        System.out.println("getValue(Key2): " + cache.get("Key2"));
-        System.out.println("getValue(Key3): " + cache.get("Key3"));
-        System.out.println("getValue(Key4): " + cache.get("Key4"));
-    }
 }

src/main/java/com/thealgorithms/datastructures/caches/MRUCache.java

@@ -166,16 +166,4 @@ public class MRUCache<K, V> {
             this.value = value;
         }
     }
-
-    public static void main(String[] args) {
-        final MRUCache<String, Integer> cache = new MRUCache<>(2);
-        cache.put("Key1", 1);
-        cache.put("Key2", 2);
-        cache.put("Key3", 3);
-        cache.put("Key4", 4);
-        System.out.println("getValue(Key1): " + cache.get("Key1"));
-        System.out.println("getValue(Key2): " + cache.get("Key2"));
-        System.out.println("getValue(Key3): " + cache.get("Key3"));
-        System.out.println("getValue(Key4): " + cache.get("Key4"));
-    }
 }

src/test/java/com/thealgorithms/datastructures/caches/LRUCacheTest.java

@@ -0,0 +1,58 @@
+package com.thealgorithms.datastructures.caches;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+
+public class LRUCacheTest {
+
+    private static final int SIZE = 5;
+
+    @Test
+    public void putAndGetIntegerValues() {
+        LRUCache<Integer, Integer> lruCache = new LRUCache<>(SIZE);
+
+        for(int i = 0; i < SIZE; i++) {
+            lruCache.put(i, i);
+        }
+
+        for(int i = 0; i < SIZE; i++) {
+            assertEquals(i, lruCache.get(i));
+        }
+    }
+
+    @Test
+    public void putAndGetStringValues() {
+        LRUCache<String, String> lruCache = new LRUCache<>(SIZE);
+
+        for(int i = 0; i < SIZE; i++) {
+            lruCache.put("key" + i, "value" + i);
+        }
+
+        for(int i = 0; i < SIZE; i++) {
+            assertEquals("value" + i, lruCache.get("key" + i));
+        }
+    }
+
+    @Test
+    public void nullKeysAndValues() {
+        LRUCache<Integer, Integer> mruCache = new LRUCache<>(SIZE);
+        mruCache.put(null, 2);
+        mruCache.put(6, null);
+
+        assertEquals(2, mruCache.get(null));
+        assertNull(mruCache.get(6));
+    }
+
+    @Test
+    public void overCapacity() {
+        LRUCache<Integer, Integer> mruCache = new LRUCache<>(SIZE);
+
+        for(int i = 0; i < 10; i++) {
+            mruCache.put(i, i);
+        }
+
+        assertEquals(9, mruCache.get(9));
+    }
+}

src/test/java/com/thealgorithms/datastructures/caches/MRUCacheTest.java

@@ -0,0 +1,58 @@
+package com.thealgorithms.datastructures.caches;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+public class MRUCacheTest {
+
+    private static final int SIZE = 5;
+
+    @Test
+    public void putAndGetIntegerValues() {
+        MRUCache<Integer, Integer> lruCache = new MRUCache<>(SIZE);
+
+        for(int i = 0; i < SIZE; i++) {
+            lruCache.put(i, i);
+        }
+
+        for(int i = 0; i < SIZE; i++) {
+            assertEquals(i, lruCache.get(i));
+        }
+    }
+
+    @Test
+    public void putAndGetStringValues() {
+        MRUCache<String, String> lruCache = new MRUCache<>(SIZE);
+
+        for(int i = 0; i < SIZE; i++) {
+            lruCache.put("key" + i, "value" + i);
+        }
+
+        for(int i = 0; i < SIZE; i++) {
+            assertEquals("value" + i, lruCache.get("key" + i));
+        }
+    }
+
+    @Test
+    public void nullKeysAndValues() {
+        MRUCache<Integer, Integer> mruCache = new MRUCache<>(SIZE);
+        mruCache.put(null, 2);
+        mruCache.put(6, null);
+
+        assertEquals(2, mruCache.get(null));
+        assertNull(mruCache.get(6));
+    }
+
+    @Test
+    public void overCapacity() {
+        MRUCache<Integer, Integer> mruCache = new MRUCache<>(SIZE);
+
+        for(int i = 0; i < 10; i++) {
+            mruCache.put(i, i);
+        }
+
+        assertEquals(9, mruCache.get(9));
+    }
+}